/////////////////////////////////////////////////////////////////////////////
|
/////////////////////////////////////////////////////////////////////////////
|
//
|
//
|
// Filename: fftgen.v
|
// Filename: fftgen.cpp
|
//
|
//
|
// Project: A Doubletime Pipelined FFT
|
// Project: A Doubletime Pipelined FFT
|
//
|
//
|
// Purpose: This is the core generator for the project. Every part
|
// Purpose: This is the core generator for the project. Every part
|
// and piece of this project begins and ends in this program.
|
// and piece of this project begins and ends in this program.
|
// Once built, this program will build an FFT (or IFFT) core
|
// Once built, this program will build an FFT (or IFFT) core
|
// of arbitrary width, precision, etc., that will run at
|
// of arbitrary width, precision, etc., that will run at
|
// two samples per clock. (Incidentally, I didn't pick two
|
// two samples per clock. (Incidentally, I didn't pick two
|
// samples per clock because it was easier, but rather because
|
// samples per clock because it was easier, but rather because
|
// there weren't any two-sample per clock FFT's posted on
|
// there weren't any two-sample per clock FFT's posted on
|
// opencores.com. Further, FFT's running at one sample per
|
// opencores.com. Further, FFT's running at one sample per
|
// clock aren't that hard to find.)
|
// clock aren't that hard to find.)
|
//
|
//
|
// You can find the documentation for this program in two places.
|
// You can find the documentation for this program in two places.
|
// One is in the usage() function below. The second is in the
|
// One is in the usage() function below. The second is in the
|
// 'doc'uments directory that comes with this package,
|
// 'doc'uments directory that comes with this package,
|
// specifically in the spec.pdf file. If it's not there, type
|
// specifically in the spec.pdf file. If it's not there, type
|
// make in the documents directory to build it.
|
// make in the documents directory to build it.
|
//
|
//
|
// Creator: Dan Gisselquist, Ph.D.
|
// Creator: Dan Gisselquist, Ph.D.
|
// Gisselquist Tecnology, LLC
|
// Gisselquist Tecnology, LLC
|
//
|
//
|
///////////////////////////////////////////////////////////////////////////
|
///////////////////////////////////////////////////////////////////////////
|
//
|
//
|
// Copyright (C) 2015, Gisselquist Technology, LLC
|
// Copyright (C) 2015, Gisselquist Technology, LLC
|
//
|
//
|
// This program is free software (firmware): you can redistribute it and/or
|
// This program is free software (firmware): you can redistribute it and/or
|
// modify it under the terms of the GNU General Public License as published
|
// modify it under the terms of the GNU General Public License as published
|
// by the Free Software Foundation, either version 3 of the License, or (at
|
// by the Free Software Foundation, either version 3 of the License, or (at
|
// your option) any later version.
|
// your option) any later version.
|
//
|
//
|
// This program is distributed in the hope that it will be useful, but WITHOUT
|
// This program is distributed in the hope that it will be useful, but WITHOUT
|
// ANY WARRANTY; without even the implied warranty of MERCHANTIBILITY or
|
// ANY WARRANTY; without even the implied warranty of MERCHANTIBILITY or
|
// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
|
// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
|
// for more details.
|
// for more details.
|
//
|
//
|
// You should have received a copy of the GNU General Public License along
|
// You should have received a copy of the GNU General Public License along
|
// with this program. (It's in the $(ROOT)/doc directory, run make with no
|
// with this program. (It's in the $(ROOT)/doc directory, run make with no
|
// target there if the PDF file isn't present.) If not, see
|
// target there if the PDF file isn't present.) If not, see
|
// <http://www.gnu.org/licenses/> for a copy.
|
// <http://www.gnu.org/licenses/> for a copy.
|
//
|
//
|
// License: GPL, v3, as defined and found on www.gnu.org,
|
// License: GPL, v3, as defined and found on www.gnu.org,
|
// http://www.gnu.org/licenses/gpl.html
|
// http://www.gnu.org/licenses/gpl.html
|
//
|
//
|
//
|
//
|
///////////////////////////////////////////////////////////////////////////
|
///////////////////////////////////////////////////////////////////////////
|
//
|
//
|
//
|
//
|
#include <stdio.h>
|
#include <stdio.h>
|
#include <stdlib.h>
|
#include <stdlib.h>
|
#include <unistd.h>
|
#include <unistd.h>
|
#include <sys/stat.h>
|
#include <sys/stat.h>
|
#include <string.h>
|
#include <string.h>
|
#include <string>
|
#include <string>
|
#include <math.h>
|
#include <math.h>
|
#include <ctype.h>
|
#include <ctype.h>
|
#include <assert.h>
|
#include <assert.h>
|
|
|
#define COREDIR "fft-core"
|
#define COREDIR "fft-core"
|
|
|
typedef enum {
|
typedef enum {
|
RND_TRUNCATE, RND_FROMZERO, RND_HALFUP, RND_CONVERGENT
|
RND_TRUNCATE, RND_FROMZERO, RND_HALFUP, RND_CONVERGENT
|
} ROUND_T;
|
} ROUND_T;
|
|
|
const char cpyleft[] =
|
const char cpyleft[] =
|
"///////////////////////////////////////////////////////////////////////////\n"
|
"///////////////////////////////////////////////////////////////////////////\n"
|
"//\n"
|
"//\n"
|
"// Copyright (C) 2015, Gisselquist Technology, LLC\n"
|
"// Copyright (C) 2015, Gisselquist Technology, LLC\n"
|
"//\n"
|
"//\n"
|
"// This program is free software (firmware): you can redistribute it and/or\n"
|
"// This program is free software (firmware): you can redistribute it and/or\n"
|
"// modify it under the terms of the GNU General Public License as published\n"
|
"// modify it under the terms of the GNU General Public License as published\n"
|
"// by the Free Software Foundation, either version 3 of the License, or (at\n"
|
"// by the Free Software Foundation, either version 3 of the License, or (at\n"
|
"// your option) any later version.\n"
|
"// your option) any later version.\n"
|
"//\n"
|
"//\n"
|
"// This program is distributed in the hope that it will be useful, but WITHOUT\n"
|
"// This program is distributed in the hope that it will be useful, but WITHOUT\n"
|
"// ANY WARRANTY; without even the implied warranty of MERCHANTIBILITY or\n"
|
"// ANY WARRANTY; without even the implied warranty of MERCHANTIBILITY or\n"
|
"// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License\n"
|
"// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License\n"
|
"// for more details.\n"
|
"// for more details.\n"
|
"//\n"
|
"//\n"
|
"// You should have received a copy of the GNU General Public License along\n"
|
"// You should have received a copy of the GNU General Public License along\n"
|
"// with this program. (It's in the $(ROOT)/doc directory, run make with no\n"
|
"// with this program. (It's in the $(ROOT)/doc directory, run make with no\n"
|
"// target there if the PDF file isn\'t present.) If not, see\n"
|
"// target there if the PDF file isn\'t present.) If not, see\n"
|
"// <http://www.gnu.org/licenses/> for a copy.\n"
|
"// <http://www.gnu.org/licenses/> for a copy.\n"
|
"//\n"
|
"//\n"
|
"// License: GPL, v3, as defined and found on www.gnu.org,\n"
|
"// License: GPL, v3, as defined and found on www.gnu.org,\n"
|
"// http://www.gnu.org/licenses/gpl.html\n"
|
"// http://www.gnu.org/licenses/gpl.html\n"
|
"//\n"
|
"//\n"
|
"//\n"
|
"//\n"
|
"///////////////////////////////////////////////////////////////////////////\n";
|
"///////////////////////////////////////////////////////////////////////////\n";
|
const char prjname[] = "A Doubletime Pipelined FFT";
|
const char prjname[] = "A Doubletime Pipelined FFT";
|
const char creator[] = "// Creator: Dan Gisselquist, Ph.D.\n"
|
const char creator[] = "// Creator: Dan Gisselquist, Ph.D.\n"
|
"// Gisselquist Tecnology, LLC\n";
|
"// Gisselquist Tecnology, LLC\n";
|
|
|
int lgval(int vl) {
|
int lgval(int vl) {
|
int lg;
|
int lg;
|
|
|
for(lg=1; (1<<lg) < vl; lg++)
|
for(lg=1; (1<<lg) < vl; lg++)
|
;
|
;
|
return lg;
|
return lg;
|
}
|
}
|
|
|
int nextlg(int vl) {
|
int nextlg(int vl) {
|
int r;
|
int r;
|
|
|
for(r=1; r<vl; r<<=1)
|
for(r=1; r<vl; r<<=1)
|
;
|
;
|
return r;
|
return r;
|
}
|
}
|
|
|
int bflydelay(int nbits, int xtra) {
|
int bflydelay(int nbits, int xtra) {
|
int cbits = nbits + xtra;
|
int cbits = nbits + xtra;
|
int delay;
|
int delay;
|
if (nbits+1<cbits)
|
if (nbits+1<cbits)
|
delay = nbits+4;
|
delay = nbits+4;
|
else
|
else
|
delay = cbits+3;
|
delay = cbits+3;
|
return delay;
|
return delay;
|
}
|
}
|
|
|
int lgdelay(int nbits, int xtra) {
|
int lgdelay(int nbits, int xtra) {
|
// The butterfly code needs to compare a valid address, of this
|
// The butterfly code needs to compare a valid address, of this
|
// many bits, with an address two greater. This guarantees we
|
// many bits, with an address two greater. This guarantees we
|
// have enough bits for that comparison. We'll also end up with
|
// have enough bits for that comparison. We'll also end up with
|
// more storage space to look for these values, but without a
|
// more storage space to look for these values, but without a
|
// redesign that's just what we'll deal with.
|
// redesign that's just what we'll deal with.
|
return lgval(bflydelay(nbits, xtra)+3);
|
return lgval(bflydelay(nbits, xtra)+3);
|
}
|
}
|
|
|
void build_truncator(const char *fname) {
|
void build_truncator(const char *fname) {
|
printf("TRUNCATING!\n");
|
printf("TRUNCATING!\n");
|
FILE *fp = fopen(fname, "w");
|
FILE *fp = fopen(fname, "w");
|
if (NULL == fp) {
|
if (NULL == fp) {
|
fprintf(stderr, "Could not open \'%s\' for writing\n", fname);
|
fprintf(stderr, "Could not open \'%s\' for writing\n", fname);
|
perror("O/S Err was:");
|
perror("O/S Err was:");
|
return;
|
return;
|
}
|
}
|
|
|
fprintf(fp,
|
fprintf(fp,
|
"///////////////////////////////////////////////////////////////////////////\n"
|
"///////////////////////////////////////////////////////////////////////////\n"
|
"//\n"
|
"//\n"
|
"// Filename: truncate.v\n"
|
"// Filename: truncate.v\n"
|
"// \n"
|
"// \n"
|
"// Project: %s\n"
|
"// Project: %s\n"
|
"//\n"
|
"//\n"
|
"// Purpose: Truncation is one of several options that can be used\n"
|
"// Purpose: Truncation is one of several options that can be used\n"
|
"// internal to the various FFT stages to drop bits from one \n"
|
"// internal to the various FFT stages to drop bits from one \n"
|
"// stage to the next. In general, it is the simplest method\n"
|
"// stage to the next. In general, it is the simplest method\n"
|
"// of dropping bits, since it requires only a bit selection.\n"
|
"// of dropping bits, since it requires only a bit selection.\n"
|
"//\n"
|
"//\n"
|
"// This form of rounding isn\'t really that great for FFT\'s,\n"
|
"// This form of rounding isn\'t really that great for FFT\'s,\n"
|
"// since it tends to produce a DC bias in the result. (Other\n"
|
"// since it tends to produce a DC bias in the result. (Other\n"
|
"// less pronounced biases may also exist.)\n"
|
"// less pronounced biases may also exist.)\n"
|
"//\n"
|
"//\n"
|
"// This particular version also registers the output with the\n"
|
"// This particular version also registers the output with the\n"
|
"// clock, so there will be a delay of one going through this\n"
|
"// clock, so there will be a delay of one going through this\n"
|
"// module. This will keep it in line with the other forms of\n"
|
"// module. This will keep it in line with the other forms of\n"
|
"// rounding that can be used.\n"
|
"// rounding that can be used.\n"
|
"//\n"
|
"//\n"
|
"//\n%s"
|
"//\n%s"
|
"//\n",
|
"//\n",
|
prjname, creator);
|
prjname, creator);
|
|
|
fprintf(fp, "%s", cpyleft);
|
fprintf(fp, "%s", cpyleft);
|
fprintf(fp,
|
fprintf(fp,
|
"module truncate(i_clk, i_ce, i_val, o_val);\n"
|
"module truncate(i_clk, i_ce, i_val, o_val);\n"
|
"\tparameter\tIWID=16, OWID=8, SHIFT=0;\n"
|
"\tparameter\tIWID=16, OWID=8, SHIFT=0;\n"
|
"\tinput\t\t\t\t\ti_clk, i_ce;\n"
|
"\tinput\t\t\t\t\ti_clk, i_ce;\n"
|
"\tinput\t\tsigned\t[(IWID-1):0]\ti_val;\n"
|
"\tinput\t\tsigned\t[(IWID-1):0]\ti_val;\n"
|
"\toutput\treg\tsigned\t[(OWID-1):0]\to_val;\n"
|
"\toutput\treg\tsigned\t[(OWID-1):0]\to_val;\n"
|
"\n"
|
"\n"
|
"\talways @(posedge i_clk)\n"
|
"\talways @(posedge i_clk)\n"
|
"\t\tif (i_ce)\n"
|
"\t\tif (i_ce)\n"
|
"\t\t\to_val <= i_val[(IWID-1-SHIFT):(IWID-SHIFT-OWID)];\n"
|
"\t\t\to_val <= i_val[(IWID-1-SHIFT):(IWID-SHIFT-OWID)];\n"
|
"\n"
|
"\n"
|
"endmodule\n");
|
"endmodule\n");
|
}
|
}
|
|
|
|
|
void build_roundhalfup(const char *fname) {
|
void build_roundhalfup(const char *fname) {
|
FILE *fp = fopen(fname, "w");
|
FILE *fp = fopen(fname, "w");
|
if (NULL == fp) {
|
if (NULL == fp) {
|
fprintf(stderr, "Could not open \'%s\' for writing\n", fname);
|
fprintf(stderr, "Could not open \'%s\' for writing\n", fname);
|
perror("O/S Err was:");
|
perror("O/S Err was:");
|
return;
|
return;
|
}
|
}
|
|
|
fprintf(fp,
|
fprintf(fp,
|
"///////////////////////////////////////////////////////////////////////////\n"
|
"///////////////////////////////////////////////////////////////////////////\n"
|
"//\n"
|
"//\n"
|
"// Filename: roundhalfup.v\n"
|
"// Filename: roundhalfup.v\n"
|
"// \n"
|
"// \n"
|
"// Project: %s\n"
|
"// Project: %s\n"
|
"//\n"
|
"//\n"
|
"// Purpose: Rounding half up is the way I was always taught to round in\n"
|
"// Purpose: Rounding half up is the way I was always taught to round in\n"
|
"// school. A one half value is added to the result, and then\n"
|
"// school. A one half value is added to the result, and then\n"
|
"// the result is truncated. When used in an FFT, this produces\n"
|
"// the result is truncated. When used in an FFT, this produces\n"
|
"// less bias than the truncation method, although a bias still\n"
|
"// less bias than the truncation method, although a bias still\n"
|
"// tends to remain.\n"
|
"// tends to remain.\n"
|
"//\n"
|
"//\n"
|
"//\n%s"
|
"//\n%s"
|
"//\n",
|
"//\n",
|
prjname, creator);
|
prjname, creator);
|
|
|
fprintf(fp, "%s", cpyleft);
|
fprintf(fp, "%s", cpyleft);
|
fprintf(fp,
|
fprintf(fp,
|
"module roundhalfup(i_clk, i_ce, i_val, o_val);\n"
|
"module roundhalfup(i_clk, i_ce, i_val, o_val);\n"
|
"\tparameter\tIWID=16, OWID=8, SHIFT=0;\n"
|
"\tparameter\tIWID=16, OWID=8, SHIFT=0;\n"
|
"\tinput\t\t\t\t\ti_clk, i_ce;\n"
|
"\tinput\t\t\t\t\ti_clk, i_ce;\n"
|
"\tinput\t\tsigned\t[(IWID-1):0]\ti_val;\n"
|
"\tinput\t\tsigned\t[(IWID-1):0]\ti_val;\n"
|
"\toutput\treg\tsigned\t[(OWID-1):0]\to_val;\n"
|
"\toutput\treg\tsigned\t[(OWID-1):0]\to_val;\n"
|
"\n"
|
"\n"
|
"\t// Let's deal with two cases to be as general as we can be here\n"
|
"\t// Let's deal with two cases to be as general as we can be here\n"
|
"\t//\n"
|
"\t//\n"
|
"\t// 1. The desired output would lose no bits at all\n"
|
"\t// 1. The desired output would lose no bits at all\n"
|
"\t// 2. One or more bits would be dropped, so the rounding is simply\n"
|
"\t// 2. One or more bits would be dropped, so the rounding is simply\n"
|
"\t//\t\ta matter of adding one to the bit about to be dropped,\n"
|
"\t//\t\ta matter of adding one to the bit about to be dropped,\n"
|
"\t//\t\tmoving all halfway and above numbers up to the next\n"
|
"\t//\t\tmoving all halfway and above numbers up to the next\n"
|
"\t//\t\tvalue.\n"
|
"\t//\t\tvalue.\n"
|
"\tgenerate\n"
|
"\tgenerate\n"
|
"\tif (IWID-SHIFT == OWID)\n"
|
"\tif (IWID-SHIFT == OWID)\n"
|
"\tbegin // No truncation or rounding, output drops no bits\n"
|
"\tbegin // No truncation or rounding, output drops no bits\n"
|
"\n"
|
"\n"
|
"\t\talways @(posedge i_clk)\n"
|
"\t\talways @(posedge i_clk)\n"
|
"\t\t\tif (i_ce)\to_val <= i_val[(IWID-SHIFT-1):0];\n"
|
"\t\t\tif (i_ce)\to_val <= i_val[(IWID-SHIFT-1):0];\n"
|
"\n"
|
"\n"
|
"\tend else // if (IWID-SHIFT-1 >= OWID)\n"
|
"\tend else // if (IWID-SHIFT-1 >= OWID)\n"
|
"\tbegin // Output drops one bit, can only add one or ... not.\n"
|
"\tbegin // Output drops one bit, can only add one or ... not.\n"
|
"\t\twire\t[(OWID-1):0] truncated_value, rounded_up;\n"
|
"\t\twire\t[(OWID-1):0] truncated_value, rounded_up;\n"
|
"\t\twire\t\t\tlast_valid_bit, first_lost_bit;\n"
|
"\t\twire\t\t\tlast_valid_bit, first_lost_bit;\n"
|
"\t\tassign\ttruncated_value=i_val[(IWID-1-SHIFT):(IWID-SHIFT-OWID)];\n"
|
"\t\tassign\ttruncated_value=i_val[(IWID-1-SHIFT):(IWID-SHIFT-OWID)];\n"
|
"\t\tassign\trounded_up=truncated_value + {{(OWID-1){1'b0}}, 1'b1 };\n"
|
"\t\tassign\trounded_up=truncated_value + {{(OWID-1){1'b0}}, 1'b1 };\n"
|
"\t\tassign\tfirst_lost_bit = i_val[(IWID-SHIFT-OWID-1)];\n"
|
"\t\tassign\tfirst_lost_bit = i_val[(IWID-SHIFT-OWID-1)];\n"
|
"\n"
|
"\n"
|
"\t\talways @(posedge i_clk)\n"
|
"\t\talways @(posedge i_clk)\n"
|
"\t\t\tif (i_ce)\n"
|
"\t\t\tif (i_ce)\n"
|
"\t\t\tbegin\n"
|
"\t\t\tbegin\n"
|
"\t\t\t\tif (~first_lost_bit) // Round down / truncate\n"
|
"\t\t\t\tif (~first_lost_bit) // Round down / truncate\n"
|
"\t\t\t\t\to_val <= truncated_value;\n"
|
"\t\t\t\t\to_val <= truncated_value;\n"
|
"\t\t\t\telse\n"
|
"\t\t\t\telse\n"
|
"\t\t\t\t\to_val <= rounded_up; // even value\n"
|
"\t\t\t\t\to_val <= rounded_up; // even value\n"
|
"\t\t\tend\n"
|
"\t\t\tend\n"
|
"\n"
|
"\n"
|
"\tend\n"
|
"\tend\n"
|
"\tendgenerate\n"
|
"\tendgenerate\n"
|
"\n"
|
"\n"
|
"endmodule\n");
|
"endmodule\n");
|
}
|
}
|
|
|
void build_roundfromzero(const char *fname) {
|
void build_roundfromzero(const char *fname) {
|
FILE *fp = fopen(fname, "w");
|
FILE *fp = fopen(fname, "w");
|
if (NULL == fp) {
|
if (NULL == fp) {
|
fprintf(stderr, "Could not open \'%s\' for writing\n", fname);
|
fprintf(stderr, "Could not open \'%s\' for writing\n", fname);
|
perror("O/S Err was:");
|
perror("O/S Err was:");
|
return;
|
return;
|
}
|
}
|
|
|
fprintf(fp,
|
fprintf(fp,
|
"///////////////////////////////////////////////////////////////////////////\n"
|
"///////////////////////////////////////////////////////////////////////////\n"
|
"//\n"
|
"//\n"
|
"// Filename: roundfromzero.v\n"
|
"// Filename: roundfromzero.v\n"
|
"// \n"
|
"// \n"
|
"// Project: %s\n"
|
"// Project: %s\n"
|
"//\n"
|
"//\n"
|
"// Purpose: Truncation is one of several options that can be used\n"
|
"// Purpose: Truncation is one of several options that can be used\n"
|
"// internal to the various FFT stages to drop bits from one \n"
|
"// internal to the various FFT stages to drop bits from one \n"
|
"// stage to the next. In general, it is the simplest method\n"
|
"// stage to the next. In general, it is the simplest method\n"
|
"// of dropping bits, since it requires only a bit selection.\n"
|
"// of dropping bits, since it requires only a bit selection.\n"
|
"//\n"
|
"//\n"
|
"// This form of rounding isn\'t really that great for FFT\'s,\n"
|
"// This form of rounding isn\'t really that great for FFT\'s,\n"
|
"// since it tends to produce a DC bias in the result. (Other\n"
|
"// since it tends to produce a DC bias in the result. (Other\n"
|
"// less pronounced biases may also exist.)\n"
|
"// less pronounced biases may also exist.)\n"
|
"//\n"
|
"//\n"
|
"// This particular version also registers the output with the\n"
|
"// This particular version also registers the output with the\n"
|
"// clock, so there will be a delay of one going through this\n"
|
"// clock, so there will be a delay of one going through this\n"
|
"// module. This will keep it in line with the other forms of\n"
|
"// module. This will keep it in line with the other forms of\n"
|
"// rounding that can be used.\n"
|
"// rounding that can be used.\n"
|
"//\n"
|
"//\n"
|
"//\n%s"
|
"//\n%s"
|
"//\n",
|
"//\n",
|
prjname, creator);
|
prjname, creator);
|
|
|
fprintf(fp, "%s", cpyleft);
|
fprintf(fp, "%s", cpyleft);
|
fprintf(fp,
|
fprintf(fp,
|
"module convround(i_clk, i_ce, i_val, o_val);\n"
|
"module convround(i_clk, i_ce, i_val, o_val);\n"
|
"\tparameter\tIWID=16, OWID=8, SHIFT=0;\n"
|
"\tparameter\tIWID=16, OWID=8, SHIFT=0;\n"
|
"\tinput\t\t\t\t\ti_clk, i_ce;\n"
|
"\tinput\t\t\t\t\ti_clk, i_ce;\n"
|
"\tinput\t\tsigned\t[(IWID-1):0]\ti_val;\n"
|
"\tinput\t\tsigned\t[(IWID-1):0]\ti_val;\n"
|
"\toutput\treg\tsigned\t[(OWID-1):0]\to_val;\n"
|
"\toutput\treg\tsigned\t[(OWID-1):0]\to_val;\n"
|
"\n"
|
"\n"
|
"\t// Let's deal with three cases to be as general as we can be here\n"
|
"\t// Let's deal with three cases to be as general as we can be here\n"
|
"\t//\n"
|
"\t//\n"
|
"\t//\t1. The desired output would lose no bits at all\n"
|
"\t//\t1. The desired output would lose no bits at all\n"
|
"\t//\t2. One bit would be dropped, so the rounding is simply\n"
|
"\t//\t2. One bit would be dropped, so the rounding is simply\n"
|
"\t//\t\tadjusting the value to be the closer to zero in\n"
|
"\t//\t\tadjusting the value to be the closer to zero in\n"
|
"\t//\t\tcases of being halfway between two. If identically\n"
|
"\t//\t\tcases of being halfway between two. If identically\n"
|
"\t//\t\tequal to a number, we just leave it as is.\n"
|
"\t//\t\tequal to a number, we just leave it as is.\n"
|
"\t//\t3. Two or more bits would be dropped. In this case, we round\n"
|
"\t//\t3. Two or more bits would be dropped. In this case, we round\n"
|
"\t//\t\tnormally unless we are rounding a value of exactly\n"
|
"\t//\t\tnormally unless we are rounding a value of exactly\n"
|
"\t//\t\thalfway between the two. In the halfway case, we\n"
|
"\t//\t\thalfway between the two. In the halfway case, we\n"
|
"\t//\t\tround away from zero.\n"
|
"\t//\t\tround away from zero.\n"
|
"\tgenerate\n"
|
"\tgenerate\n"
|
"\tif (IWID-SHIFT == OWID)\n"
|
"\tif (IWID-SHIFT == OWID)\n"
|
"\tbegin // No truncation or rounding, output drops no bits\n"
|
"\tbegin // No truncation or rounding, output drops no bits\n"
|
"\n"
|
"\n"
|
"\t\talways @(posedge i_clk)\n"
|
"\t\talways @(posedge i_clk)\n"
|
"\t\t\tif (i_ce)\to_val <= i_val[(IWID-SHIFT-1):0];\n"
|
"\t\t\tif (i_ce)\to_val <= i_val[(IWID-SHIFT-1):0];\n"
|
"\n"
|
"\n"
|
"\tend else if (IWID-SHIFT-1 == OWID)\n"
|
"\tend else if (IWID-SHIFT-1 == OWID)\n"
|
"\tbegin // Output drops one bit, can only add one or ... not.\n"
|
"\tbegin // Output drops one bit, can only add one or ... not.\n"
|
"\t\twire\t[(OWID-1):0]\ttruncated_value, rounded_up;\n"
|
"\t\twire\t[(OWID-1):0]\ttruncated_value, rounded_up;\n"
|
"\t\twire\t\t\tsign_bit, first_lost_bit;\n"
|
"\t\twire\t\t\tsign_bit, first_lost_bit;\n"
|
"\t\tassign\ttruncated_value=i_val[(IWID-1-SHIFT):(IWID-SHIFT-OWID)];\n"
|
"\t\tassign\ttruncated_value=i_val[(IWID-1-SHIFT):(IWID-SHIFT-OWID)];\n"
|
"\t\tassign\trounded_up=truncated_value + {{(OWID-1){1'b0}}, 1'b1 };\n"
|
"\t\tassign\trounded_up=truncated_value + {{(OWID-1){1'b0}}, 1'b1 };\n"
|
"\t\tassign\tfirst_lost_bit = i_val[0];\n"
|
"\t\tassign\tfirst_lost_bit = i_val[0];\n"
|
"\t\tassign\tsign_bit = i_val[(IWID-1)];\n"
|
"\t\tassign\tsign_bit = i_val[(IWID-1)];\n"
|
"\n"
|
"\n"
|
"\t\talways @(posedge i_clk)\n"
|
"\t\talways @(posedge i_clk)\n"
|
"\t\t\tif (i_ce)\n"
|
"\t\t\tif (i_ce)\n"
|
"\t\t\tbegin\n"
|
"\t\t\tbegin\n"
|
"\t\t\t\tif (~first_lost_bit) // Round down / truncate\n"
|
"\t\t\t\tif (~first_lost_bit) // Round down / truncate\n"
|
"\t\t\t\t\to_val <= truncated_value;\n"
|
"\t\t\t\t\to_val <= truncated_value;\n"
|
"\t\t\t\telse if (sign_bit)\n"
|
"\t\t\t\telse if (sign_bit)\n"
|
"\t\t\t\t\to_val <= truncated_value;\n"
|
"\t\t\t\t\to_val <= truncated_value;\n"
|
"\t\t\t\telse\n"
|
"\t\t\t\telse\n"
|
"\t\t\t\t\to_val <= rounded_up;\n"
|
"\t\t\t\t\to_val <= rounded_up;\n"
|
"\t\t\tend\n"
|
"\t\t\tend\n"
|
"\n"
|
"\n"
|
"\tend else // If there's more than one bit we are dropping\n"
|
"\tend else // If there's more than one bit we are dropping\n"
|
"\tbegin\n"
|
"\tbegin\n"
|
"\t\twire\t[(OWID-1):0]\ttruncated_value, rounded_up;\n"
|
"\t\twire\t[(OWID-1):0]\ttruncated_value, rounded_up;\n"
|
"\t\twire\t\t\tsign_bit, first_lost_bit;\n"
|
"\t\twire\t\t\tsign_bit, first_lost_bit;\n"
|
"\t\tassign\ttruncated_value=i_val[(IWID-1-SHIFT):(IWID-SHIFT-OWID)];\n"
|
"\t\tassign\ttruncated_value=i_val[(IWID-1-SHIFT):(IWID-SHIFT-OWID)];\n"
|
"\t\tassign\trounded_up=truncated_value + {{(OWID-1){1'b0}}, 1'b1 };\n"
|
"\t\tassign\trounded_up=truncated_value + {{(OWID-1){1'b0}}, 1'b1 };\n"
|
"\t\tassign\tfirst_lost_bit = i_val[(IWID-SHIFT-OWID-1)];\n"
|
"\t\tassign\tfirst_lost_bit = i_val[(IWID-SHIFT-OWID-1)];\n"
|
"\t\tassign\tsign_bit = i_val[(IWID-1)];\n"
|
"\t\tassign\tsign_bit = i_val[(IWID-1)];\n"
|
"\n"
|
"\n"
|
"\t\twire\t[(IWID-SHIFT-OWID-2):0]\tother_lost_bits;\n"
|
"\t\twire\t[(IWID-SHIFT-OWID-2):0]\tother_lost_bits;\n"
|
"\t\tassign\tother_lost_bits = i_val[(IWID-SHIFT-OWID-2):0];\n"
|
"\t\tassign\tother_lost_bits = i_val[(IWID-SHIFT-OWID-2):0];\n"
|
"\n"
|
"\n"
|
"\t\talways @(posedge i_clk)\n"
|
"\t\talways @(posedge i_clk)\n"
|
"\t\t\tif (i_ce)\n"
|
"\t\t\tif (i_ce)\n"
|
"\t\t\tbegin\n"
|
"\t\t\tbegin\n"
|
"\t\t\t\tif (~first_lost_bit) // Round down / truncate\n"
|
"\t\t\t\tif (~first_lost_bit) // Round down / truncate\n"
|
"\t\t\t\t\to_val <= truncated_value;\n"
|
"\t\t\t\t\to_val <= truncated_value;\n"
|
"\t\t\t\telse if (|other_lost_bits) // Round up to\n"
|
"\t\t\t\telse if (|other_lost_bits) // Round up to\n"
|
"\t\t\t\t\to_val <= rounded_up; // closest value\n"
|
"\t\t\t\t\to_val <= rounded_up; // closest value\n"
|
"\t\t\t\telse if (sign_bit)\n"
|
"\t\t\t\telse if (sign_bit)\n"
|
"\t\t\t\t\to_val <= truncated_value;\n"
|
"\t\t\t\t\to_val <= truncated_value;\n"
|
"\t\t\t\telse\n"
|
"\t\t\t\telse\n"
|
"\t\t\t\t\to_val <= rounded_up;\n"
|
"\t\t\t\t\to_val <= rounded_up;\n"
|
"\t\t\tend\n"
|
"\t\t\tend\n"
|
"\tend\n"
|
"\tend\n"
|
"\tendgenerate\n"
|
"\tendgenerate\n"
|
"\n"
|
"\n"
|
"endmodule\n");
|
"endmodule\n");
|
}
|
}
|
|
|
void build_convround(const char *fname) {
|
void build_convround(const char *fname) {
|
printf("CONVERGENT--ROUNDING!\n");
|
|
FILE *fp = fopen(fname, "w");
|
FILE *fp = fopen(fname, "w");
|
if (NULL == fp) {
|
if (NULL == fp) {
|
fprintf(stderr, "Could not open \'%s\' for writing\n", fname);
|
fprintf(stderr, "Could not open \'%s\' for writing\n", fname);
|
perror("O/S Err was:");
|
perror("O/S Err was:");
|
return;
|
return;
|
}
|
}
|
|
|
fprintf(fp,
|
fprintf(fp,
|
"///////////////////////////////////////////////////////////////////////////\n"
|
"///////////////////////////////////////////////////////////////////////////\n"
|
"//\n"
|
"//\n"
|
"// Filename: convround.v\n"
|
"// Filename: convround.v\n"
|
"// \n"
|
"// \n"
|
"// Project: %s\n"
|
"// Project: %s\n"
|
"//\n"
|
"//\n"
|
"// Purpose: A convergent rounding routine, also known as banker\'s\n"
|
"// Purpose: A convergent rounding routine, also known as banker\'s\n"
|
"// rounding, Dutch rounding, Gaussian rounding, unbiased\n"
|
"// rounding, Dutch rounding, Gaussian rounding, unbiased\n"
|
"// rounding, or ... more, at least according to Wikipedia.\n"
|
"// rounding, or ... more, at least according to Wikipedia.\n"
|
"//\n"
|
"//\n"
|
"// This form of rounding works by rounding, when the direction\n"
|
"// This form of rounding works by rounding, when the direction\n"
|
"// is in question, towards the nearest even value.\n"
|
"// is in question, towards the nearest even value.\n"
|
"//\n"
|
"//\n"
|
"//\n%s"
|
"//\n%s"
|
"//\n",
|
"//\n",
|
prjname, creator);
|
prjname, creator);
|
|
|
fprintf(fp, "%s", cpyleft);
|
fprintf(fp, "%s", cpyleft);
|
fprintf(fp,
|
fprintf(fp,
|
"module convround(i_clk, i_ce, i_val, o_val);\n"
|
"module convround(i_clk, i_ce, i_val, o_val);\n"
|
"\tparameter\tIWID=16, OWID=8, SHIFT=0;\n"
|
"\tparameter\tIWID=16, OWID=8, SHIFT=0;\n"
|
"\tinput\t\t\t\t\ti_clk, i_ce;\n"
|
"\tinput\t\t\t\t\ti_clk, i_ce;\n"
|
"\tinput\t\tsigned\t[(IWID-1):0]\ti_val;\n"
|
"\tinput\t\tsigned\t[(IWID-1):0]\ti_val;\n"
|
"\toutput\treg\tsigned\t[(OWID-1):0]\to_val;\n"
|
"\toutput\treg\tsigned\t[(OWID-1):0]\to_val;\n"
|
"\n"
|
"\n"
|
"\t// Let's deal with three cases to be as general as we can be here\n"
|
"\t// Let's deal with three cases to be as general as we can be here\n"
|
"\t//\n"
|
"\t//\n"
|
"\t//\t1. The desired output would lose no bits at all\n"
|
"\t//\t1. The desired output would lose no bits at all\n"
|
"\t//\t2. One bit would be dropped, so the rounding is simply\n"
|
"\t//\t2. One bit would be dropped, so the rounding is simply\n"
|
"\t//\t\tadjusting the value to be the nearest even number in\n"
|
"\t//\t\tadjusting the value to be the nearest even number in\n"
|
"\t//\t\tcases of being halfway between two. If identically\n"
|
"\t//\t\tcases of being halfway between two. If identically\n"
|
"\t//\t\tequal to a number, we just leave it as is.\n"
|
"\t//\t\tequal to a number, we just leave it as is.\n"
|
"\t//\t3. Two or more bits would be dropped. In this case, we round\n"
|
"\t//\t3. Two or more bits would be dropped. In this case, we round\n"
|
"\t//\t\tnormally unless we are rounding a value of exactly\n"
|
"\t//\t\tnormally unless we are rounding a value of exactly\n"
|
"\t//\t\thalfway between the two. In the halfway case we round\n"
|
"\t//\t\thalfway between the two. In the halfway case we round\n"
|
"\t//\t\tto the nearest even number.\n"
|
"\t//\t\tto the nearest even number.\n"
|
"\tgenerate\n"
|
"\tgenerate\n"
|
"\tif (IWID-SHIFT == OWID)\n"
|
"\tif (IWID-SHIFT == OWID)\n"
|
"\tbegin // No truncation or rounding, output drops no bits\n"
|
"\tbegin // No truncation or rounding, output drops no bits\n"
|
"\n"
|
"\n"
|
"\t\talways @(posedge i_clk)\n"
|
"\t\talways @(posedge i_clk)\n"
|
"\t\t\tif (i_ce)\to_val <= i_val[(IWID-SHIFT-1):0];\n"
|
"\t\t\tif (i_ce)\to_val <= i_val[(IWID-SHIFT-1):0];\n"
|
"\n"
|
"\n"
|
"\tend else if (IWID-SHIFT-1 == OWID)\n"
|
"\tend else if (IWID-SHIFT-1 == OWID)\n"
|
"\tbegin // Output drops one bit, can only add one or ... not.\n"
|
"\tbegin // Output drops one bit, can only add one or ... not.\n"
|
"\t\twire\t[(OWID-1):0] truncated_value, rounded_up;\n"
|
"\t\twire\t[(OWID-1):0] truncated_value, rounded_up;\n"
|
"\t\twire\t\t\tlast_valid_bit, first_lost_bit;\n"
|
"\t\twire\t\t\tlast_valid_bit, first_lost_bit;\n"
|
"\t\tassign\ttruncated_value=i_val[(IWID-1-SHIFT):(IWID-SHIFT-OWID)];\n"
|
"\t\tassign\ttruncated_value=i_val[(IWID-1-SHIFT):(IWID-SHIFT-OWID)];\n"
|
"\t\tassign\trounded_up=truncated_value + {{(OWID-1){1'b0}}, 1'b1 };\n"
|
"\t\tassign\trounded_up=truncated_value + {{(OWID-1){1'b0}}, 1'b1 };\n"
|
"\t\tassign\tlast_valid_bit = truncated_value[0];\n"
|
"\t\tassign\tlast_valid_bit = truncated_value[0];\n"
|
"\t\tassign\tfirst_lost_bit = i_val[0];\n"
|
"\t\tassign\tfirst_lost_bit = i_val[0];\n"
|
"\n"
|
"\n"
|
"\t\talways @(posedge i_clk)\n"
|
"\t\talways @(posedge i_clk)\n"
|
"\t\t\tif (i_ce)\n"
|
"\t\t\tif (i_ce)\n"
|
"\t\t\tbegin\n"
|
"\t\t\tbegin\n"
|
"\t\t\t\tif (~first_lost_bit) // Round down / truncate\n"
|
"\t\t\t\tif (~first_lost_bit) // Round down / truncate\n"
|
"\t\t\t\t\to_val <= truncated_value;\n"
|
"\t\t\t\t\to_val <= truncated_value;\n"
|
"\t\t\t\telse if (last_valid_bit)// Round up to nearest\n"
|
"\t\t\t\telse if (last_valid_bit)// Round up to nearest\n"
|
"\t\t\t\t\to_val <= rounded_up; // even value\n"
|
"\t\t\t\t\to_val <= rounded_up; // even value\n"
|
"\t\t\t\telse // else round down to the nearest\n"
|
"\t\t\t\telse // else round down to the nearest\n"
|
"\t\t\t\t\to_val <= truncated_value; // even value\n"
|
"\t\t\t\t\to_val <= truncated_value; // even value\n"
|
"\t\t\tend\n"
|
"\t\t\tend\n"
|
"\n"
|
"\n"
|
"\tend else // If there's more than one bit we are dropping\n"
|
"\tend else // If there's more than one bit we are dropping\n"
|
"\tbegin\n"
|
"\tbegin\n"
|
"\t\twire\t[(OWID-1):0] truncated_value, rounded_up;\n"
|
"\t\twire\t[(OWID-1):0] truncated_value, rounded_up;\n"
|
"\t\twire\t\t\tlast_valid_bit, first_lost_bit;\n"
|
"\t\twire\t\t\tlast_valid_bit, first_lost_bit;\n"
|
"\t\tassign\ttruncated_value=i_val[(IWID-1-SHIFT):(IWID-SHIFT-OWID)];\n"
|
"\t\tassign\ttruncated_value=i_val[(IWID-1-SHIFT):(IWID-SHIFT-OWID)];\n"
|
"\t\tassign\trounded_up=truncated_value + {{(OWID-1){1'b0}}, 1'b1 };\n"
|
"\t\tassign\trounded_up=truncated_value + {{(OWID-1){1'b0}}, 1'b1 };\n"
|
"\t\tassign\tlast_valid_bit = truncated_value[0];\n"
|
"\t\tassign\tlast_valid_bit = truncated_value[0];\n"
|
"\t\tassign\tfirst_lost_bit = i_val[(IWID-SHIFT-OWID-1)];\n"
|
"\t\tassign\tfirst_lost_bit = i_val[(IWID-SHIFT-OWID-1)];\n"
|
"\n"
|
"\n"
|
"\t\twire\t[(IWID-SHIFT-OWID-2):0]\tother_lost_bits;\n"
|
"\t\twire\t[(IWID-SHIFT-OWID-2):0]\tother_lost_bits;\n"
|
"\t\tassign\tother_lost_bits = i_val[(IWID-SHIFT-OWID-2):0];\n"
|
"\t\tassign\tother_lost_bits = i_val[(IWID-SHIFT-OWID-2):0];\n"
|
"\n"
|
"\n"
|
"\t\talways @(posedge i_clk)\n"
|
"\t\talways @(posedge i_clk)\n"
|
"\t\t\tif (i_ce)\n"
|
"\t\t\tif (i_ce)\n"
|
"\t\t\tbegin\n"
|
"\t\t\tbegin\n"
|
"\t\t\t\tif (~first_lost_bit) // Round down / truncate\n"
|
"\t\t\t\tif (~first_lost_bit) // Round down / truncate\n"
|
"\t\t\t\t\to_val <= truncated_value;\n"
|
"\t\t\t\t\to_val <= truncated_value;\n"
|
"\t\t\t\telse if (|other_lost_bits) // Round up to\n"
|
"\t\t\t\telse if (|other_lost_bits) // Round up to\n"
|
"\t\t\t\t\to_val <= rounded_up; // closest value\n"
|
"\t\t\t\t\to_val <= rounded_up; // closest value\n"
|
"\t\t\t\telse if (last_valid_bit) // Round up to\n"
|
"\t\t\t\telse if (last_valid_bit) // Round up to\n"
|
"\t\t\t\t\to_val <= rounded_up; // nearest even\n"
|
"\t\t\t\t\to_val <= rounded_up; // nearest even\n"
|
"\t\t\t\telse // else round down to nearest even\n"
|
"\t\t\t\telse // else round down to nearest even\n"
|
"\t\t\t\t\to_val <= truncated_value;\n"
|
"\t\t\t\t\to_val <= truncated_value;\n"
|
"\t\t\tend\n"
|
"\t\t\tend\n"
|
"\tend\n"
|
"\tend\n"
|
"\tendgenerate\n"
|
"\tendgenerate\n"
|
"\n"
|
"\n"
|
"endmodule\n");
|
"endmodule\n");
|
}
|
}
|
|
|
void build_quarters(const char *fname, ROUND_T rounding) {
|
void build_quarters(const char *fname, ROUND_T rounding) {
|
FILE *fp = fopen(fname, "w");
|
FILE *fp = fopen(fname, "w");
|
if (NULL == fp) {
|
if (NULL == fp) {
|
fprintf(stderr, "Could not open \'%s\' for writing\n", fname);
|
fprintf(stderr, "Could not open \'%s\' for writing\n", fname);
|
perror("O/S Err was:");
|
perror("O/S Err was:");
|
return;
|
return;
|
}
|
}
|
const char *rnd_string;
|
const char *rnd_string;
|
if (rounding == RND_TRUNCATE)
|
if (rounding == RND_TRUNCATE)
|
rnd_string = "truncate";
|
rnd_string = "truncate";
|
else if (rounding == RND_FROMZERO)
|
else if (rounding == RND_FROMZERO)
|
rnd_string = "roundfromzero";
|
rnd_string = "roundfromzero";
|
else if (rounding == RND_HALFUP)
|
else if (rounding == RND_HALFUP)
|
rnd_string = "roundhalfup";
|
rnd_string = "roundhalfup";
|
else
|
else
|
rnd_string = "convround";
|
rnd_string = "convround";
|
|
|
|
|
fprintf(fp,
|
fprintf(fp,
|
"///////////////////////////////////////////////////////////////////////////\n"
|
"///////////////////////////////////////////////////////////////////////////\n"
|
"//\n"
|
"//\n"
|
"// Filename: qtrstage.v\n"
|
"// Filename: qtrstage.v\n"
|
"// \n"
|
"// \n"
|
"// Project: %s\n"
|
"// Project: %s\n"
|
"//\n"
|
"//\n"
|
"// Purpose: This file encapsulates the 4 point stage of a decimation in\n"
|
"// Purpose: This file encapsulates the 4 point stage of a decimation in\n"
|
"// frequency FFT. This particular implementation is optimized\n"
|
"// frequency FFT. This particular implementation is optimized\n"
|
"// so that all of the multiplies are accomplished by additions\n"
|
"// so that all of the multiplies are accomplished by additions\n"
|
"// and multiplexers only.\n"
|
"// and multiplexers only.\n"
|
"//\n"
|
"//\n"
|
"//\n%s"
|
"//\n%s"
|
"//\n",
|
"//\n",
|
prjname, creator);
|
prjname, creator);
|
fprintf(fp, "%s", cpyleft);
|
fprintf(fp, "%s", cpyleft);
|
|
|
fprintf(fp,
|
fprintf(fp,
|
"module\tqtrstage(i_clk, i_rst, i_ce, i_sync, i_data, o_data, o_sync);\n"
|
"module\tqtrstage(i_clk, i_rst, i_ce, i_sync, i_data, o_data, o_sync);\n"
|
"\tparameter IWIDTH=16, OWIDTH=IWIDTH+1;\n"
|
"\tparameter IWIDTH=16, OWIDTH=IWIDTH+1;\n"
|
"\t// Parameters specific to the core that should be changed when this\n"
|
"\t// Parameters specific to the core that should be changed when this\n"
|
"\t// core is built ... Note that the minimum LGSPAN is 2. Smaller \n"
|
"\t// core is built ... Note that the minimum LGSPAN is 2. Smaller \n"
|
"\t// spans must use the fftdoubles stage.\n"
|
"\t// spans must use the fftdoubles stage.\n"
|
"\tparameter\tLGWIDTH=8, ODD=0, INVERSE=0,SHIFT=0;\n"
|
"\tparameter\tLGWIDTH=8, ODD=0, INVERSE=0,SHIFT=0;\n"
|
"\tinput\t i_clk, i_rst, i_ce, i_sync;\n"
|
"\tinput\t i_clk, i_rst, i_ce, i_sync;\n"
|
"\tinput\t [(2*IWIDTH-1):0] i_data;\n"
|
"\tinput\t [(2*IWIDTH-1):0] i_data;\n"
|
"\toutput\treg [(2*OWIDTH-1):0] o_data;\n"
|
"\toutput\treg [(2*OWIDTH-1):0] o_data;\n"
|
"\toutput\treg o_sync;\n"
|
"\toutput\treg o_sync;\n"
|
"\t\n");
|
"\t\n");
|
fprintf(fp,
|
fprintf(fp,
|
"\treg\t wait_for_sync;\n"
|
"\treg\t wait_for_sync;\n"
|
"\treg\t[3:0] pipeline;\n"
|
"\treg\t[3:0] pipeline;\n"
|
"\n"
|
"\n"
|
"\treg\t[(IWIDTH):0] sum_r, sum_i, diff_r, diff_i;\n"
|
"\treg\t[(IWIDTH):0] sum_r, sum_i, diff_r, diff_i;\n"
|
"\twire\t[(IWIDTH):0] n_diff_r, n_diff_i;\n"
|
"\twire\t[(IWIDTH):0] n_diff_r, n_diff_i;\n"
|
"\tassign n_diff_r = -diff_r;\n"
|
"\tassign n_diff_r = -diff_r;\n"
|
"\tassign n_diff_i = -diff_i;\n"
|
"\tassign n_diff_i = -diff_i;\n"
|
"\n"
|
"\n"
|
"\treg\t[(2*OWIDTH-1):0]\tob_a;\n"
|
"\treg\t[(2*OWIDTH-1):0]\tob_a;\n"
|
"\twire\t[(2*OWIDTH-1):0]\tob_b;\n"
|
"\twire\t[(2*OWIDTH-1):0]\tob_b;\n"
|
"\treg\t[(OWIDTH-1):0]\t\tob_b_r, ob_b_i;\n"
|
"\treg\t[(OWIDTH-1):0]\t\tob_b_r, ob_b_i;\n"
|
"\tassign\tob_b = { ob_b_r, ob_b_i };\n"
|
"\tassign\tob_b = { ob_b_r, ob_b_i };\n"
|
"\n"
|
"\n"
|
"\treg\t[(LGWIDTH-1):0]\t\tiaddr;\n"
|
"\treg\t[(LGWIDTH-1):0]\t\tiaddr;\n"
|
"\treg\t[(2*IWIDTH-1):0]\timem;\n"
|
"\treg\t[(2*IWIDTH-1):0]\timem;\n"
|
"\n"
|
"\n"
|
"\twire\tsigned\t[(IWIDTH-1):0]\timem_r, imem_i;\n"
|
"\twire\tsigned\t[(IWIDTH-1):0]\timem_r, imem_i;\n"
|
"\tassign\timem_r = imem[(2*IWIDTH-1):(IWIDTH)];\n"
|
"\tassign\timem_r = imem[(2*IWIDTH-1):(IWIDTH)];\n"
|
"\tassign\timem_i = imem[(IWIDTH-1):0];\n"
|
"\tassign\timem_i = imem[(IWIDTH-1):0];\n"
|
"\n"
|
"\n"
|
"\twire\tsigned\t[(IWIDTH-1):0]\ti_data_r, i_data_i;\n"
|
"\twire\tsigned\t[(IWIDTH-1):0]\ti_data_r, i_data_i;\n"
|
"\tassign\ti_data_r = i_data[(2*IWIDTH-1):(IWIDTH)];\n"
|
"\tassign\ti_data_r = i_data[(2*IWIDTH-1):(IWIDTH)];\n"
|
"\tassign\ti_data_i = i_data[(IWIDTH-1):0];\n"
|
"\tassign\ti_data_i = i_data[(IWIDTH-1):0];\n"
|
"\n"
|
"\n"
|
"\treg [(2*OWIDTH-1):0] omem;\n"
|
"\treg [(2*OWIDTH-1):0] omem;\n"
|
"\n");
|
"\n");
|
fprintf(fp,
|
fprintf(fp,
|
"\twire\tsigned\t[(OWIDTH-1):0]\trnd_sum_r, rnd_sum_i, rnd_diff_r, rnd_diff_i,\n");
|
"\twire\tsigned\t[(OWIDTH-1):0]\trnd_sum_r, rnd_sum_i, rnd_diff_r, rnd_diff_i,\n");
|
fprintf(fp,
|
fprintf(fp,
|
"\t\t\t\t\tn_rnd_diff_r, n_rnd_diff_i;\n");
|
"\t\t\t\t\tn_rnd_diff_r, n_rnd_diff_i;\n");
|
fprintf(fp,
|
fprintf(fp,
|
"\t%s\t#(IWIDTH+1,OWIDTH,SHIFT)\tdo_rnd_sum_r(i_clk, i_ce,\n"
|
"\t%s\t#(IWIDTH+1,OWIDTH,SHIFT)\tdo_rnd_sum_r(i_clk, i_ce,\n"
|
"\t\t\t\tsum_r, rnd_sum_r);\n\n", rnd_string);
|
"\t\t\t\tsum_r, rnd_sum_r);\n\n", rnd_string);
|
fprintf(fp,
|
fprintf(fp,
|
"\t%s\t#(IWIDTH+1,OWIDTH,SHIFT)\tdo_rnd_sum_i(i_clk, i_ce,\n"
|
"\t%s\t#(IWIDTH+1,OWIDTH,SHIFT)\tdo_rnd_sum_i(i_clk, i_ce,\n"
|
"\t\t\t\tsum_i, rnd_sum_i);\n\n", rnd_string);
|
"\t\t\t\tsum_i, rnd_sum_i);\n\n", rnd_string);
|
fprintf(fp,
|
fprintf(fp,
|
"\t%s\t#(IWIDTH+1,OWIDTH,SHIFT)\tdo_rnd_diff_r(i_clk, i_ce,\n"
|
"\t%s\t#(IWIDTH+1,OWIDTH,SHIFT)\tdo_rnd_diff_r(i_clk, i_ce,\n"
|
"\t\t\t\tdiff_r, rnd_diff_r);\n\n", rnd_string);
|
"\t\t\t\tdiff_r, rnd_diff_r);\n\n", rnd_string);
|
fprintf(fp,
|
fprintf(fp,
|
"\t%s\t#(IWIDTH+1,OWIDTH,SHIFT)\tdo_rnd_diff_i(i_clk, i_ce,\n"
|
"\t%s\t#(IWIDTH+1,OWIDTH,SHIFT)\tdo_rnd_diff_i(i_clk, i_ce,\n"
|
"\t\t\t\tdiff_i, rnd_diff_i);\n\n", rnd_string);
|
"\t\t\t\tdiff_i, rnd_diff_i);\n\n", rnd_string);
|
fprintf(fp, "\tassign n_rnd_diff_r = - rnd_diff_r;\n"
|
fprintf(fp, "\tassign n_rnd_diff_r = - rnd_diff_r;\n"
|
"\tassign n_rnd_diff_i = - rnd_diff_i;\n");
|
"\tassign n_rnd_diff_i = - rnd_diff_i;\n");
|
/*
|
/*
|
fprintf(fp,
|
fprintf(fp,
|
"\twire [(IWIDTH-1):0] rnd;\n"
|
"\twire [(IWIDTH-1):0] rnd;\n"
|
"\tgenerate\n"
|
"\tgenerate\n"
|
"\tif ((ROUND)&&((IWIDTH+1-OWIDTH-SHIFT)>0))\n"
|
"\tif ((ROUND)&&((IWIDTH+1-OWIDTH-SHIFT)>0))\n"
|
"\t\tassign rnd = { {(IWIDTH-1){1'b0}}, 1'b1 };\n"
|
"\t\tassign rnd = { {(IWIDTH-1){1'b0}}, 1'b1 };\n"
|
"\telse\n"
|
"\telse\n"
|
"\t\tassign rnd = { {(IWIDTH){1'b0}}};\n"
|
"\t\tassign rnd = { {(IWIDTH){1'b0}}};\n"
|
"\tendgenerate\n"
|
"\tendgenerate\n"
|
"\n"
|
"\n"
|
*/
|
*/
|
fprintf(fp,
|
fprintf(fp,
|
"\talways @(posedge i_clk)\n"
|
"\talways @(posedge i_clk)\n"
|
"\t\tif (i_rst)\n"
|
"\t\tif (i_rst)\n"
|
"\t\tbegin\n"
|
"\t\tbegin\n"
|
"\t\t\twait_for_sync <= 1'b1;\n"
|
"\t\t\twait_for_sync <= 1'b1;\n"
|
"\t\t\tiaddr <= 0;\n"
|
"\t\t\tiaddr <= 0;\n"
|
"\t\tend else if ((i_ce)&&((~wait_for_sync)||(i_sync)))\n"
|
"\t\tend else if ((i_ce)&&((~wait_for_sync)||(i_sync)))\n"
|
"\t\tbegin\n"
|
"\t\tbegin\n"
|
"\t\t\timem <= i_data;\n"
|
"\t\t\timem <= i_data;\n"
|
"\t\t\tiaddr <= iaddr + 1;\n"
|
"\t\t\tiaddr <= iaddr + 1;\n"
|
"\t\t\twait_for_sync <= 1'b0;\n"
|
"\t\t\twait_for_sync <= 1'b0;\n"
|
"\t\tend\n\n");
|
"\t\tend\n\n");
|
fprintf(fp,
|
fprintf(fp,
|
"\t// Note that we don\'t check on wait_for_sync or i_sync here.\n"
|
"\t// Note that we don\'t check on wait_for_sync or i_sync here.\n"
|
"\t// Why not? Because iaddr will always be zero until after the\n"
|
"\t// Why not? Because iaddr will always be zero until after the\n"
|
"\t// first i_ce, so we are safe.\n"
|
"\t// first i_ce, so we are safe.\n"
|
"\talways\t@(posedge i_clk)\n"
|
"\talways\t@(posedge i_clk)\n"
|
"\t\tif (i_rst)\n"
|
"\t\tif (i_rst)\n"
|
"\t\t\tpipeline <= 4'h0;\n"
|
"\t\t\tpipeline <= 4'h0;\n"
|
"\t\telse if (i_ce) // is our pipeline process full? Which stages?\n"
|
"\t\telse if (i_ce) // is our pipeline process full? Which stages?\n"
|
"\t\t\tpipeline <= { pipeline[2:0], iaddr[0] };\n\n");
|
"\t\t\tpipeline <= { pipeline[2:0], iaddr[0] };\n\n");
|
fprintf(fp,
|
fprintf(fp,
|
"\t// This is the pipeline[-1] stage, pipeline[0] will be set next.\n"
|
"\t// This is the pipeline[-1] stage, pipeline[0] will be set next.\n"
|
"\talways\t@(posedge i_clk)\n"
|
"\talways\t@(posedge i_clk)\n"
|
"\t\tif ((i_ce)&&(iaddr[0]))\n"
|
"\t\tif ((i_ce)&&(iaddr[0]))\n"
|
"\t\tbegin\n"
|
"\t\tbegin\n"
|
"\t\t\tsum_r <= imem_r + i_data_r;\n"
|
"\t\t\tsum_r <= imem_r + i_data_r;\n"
|
"\t\t\tsum_i <= imem_i + i_data_i;\n"
|
"\t\t\tsum_i <= imem_i + i_data_i;\n"
|
"\t\t\tdiff_r <= imem_r - i_data_r;\n"
|
"\t\t\tdiff_r <= imem_r - i_data_r;\n"
|
"\t\t\tdiff_i <= imem_i - i_data_i;\n"
|
"\t\t\tdiff_i <= imem_i - i_data_i;\n"
|
"\t\tend\n\n");
|
"\t\tend\n\n");
|
fprintf(fp,
|
fprintf(fp,
|
"\t// pipeline[1] takes sum_x and diff_x and produces rnd_x\n\n");
|
"\t// pipeline[1] takes sum_x and diff_x and produces rnd_x\n\n");
|
fprintf(fp,
|
fprintf(fp,
|
"\t// Now for pipeline[2]\n"
|
"\t// Now for pipeline[2]\n"
|
"\talways\t@(posedge i_clk)\n"
|
"\talways\t@(posedge i_clk)\n"
|
"\t\tif ((i_ce)&&(pipeline[2]))\n"
|
"\t\tif ((i_ce)&&(pipeline[2]))\n"
|
"\t\tbegin\n"
|
"\t\tbegin\n"
|
"\t\t\tob_a <= { rnd_sum_r, rnd_sum_i };\n"
|
"\t\t\tob_a <= { rnd_sum_r, rnd_sum_i };\n"
|
"\t\t\t// on Even, W = e^{-j2pi 1/4 0} = 1\n"
|
"\t\t\t// on Even, W = e^{-j2pi 1/4 0} = 1\n"
|
"\t\t\tif (ODD == 0)\n"
|
"\t\t\tif (ODD == 0)\n"
|
"\t\t\tbegin\n"
|
"\t\t\tbegin\n"
|
"\t\t\t\tob_b_r <= rnd_diff_r;\n"
|
"\t\t\t\tob_b_r <= rnd_diff_r;\n"
|
"\t\t\t\tob_b_i <= rnd_diff_i;\n"
|
"\t\t\t\tob_b_i <= rnd_diff_i;\n"
|
"\t\t\tend else if (INVERSE==0) begin\n"
|
"\t\t\tend else if (INVERSE==0) begin\n"
|
"\t\t\t\t// on Odd, W = e^{-j2pi 1/4} = -j\n"
|
"\t\t\t\t// on Odd, W = e^{-j2pi 1/4} = -j\n"
|
"\t\t\t\tob_b_r <= rnd_diff_i;\n"
|
"\t\t\t\tob_b_r <= rnd_diff_i;\n"
|
"\t\t\t\tob_b_i <= n_rnd_diff_r;\n"
|
"\t\t\t\tob_b_i <= n_rnd_diff_r;\n"
|
"\t\t\tend else begin\n"
|
"\t\t\tend else begin\n"
|
"\t\t\t\t// on Odd, W = e^{j2pi 1/4} = j\n"
|
"\t\t\t\t// on Odd, W = e^{j2pi 1/4} = j\n"
|
"\t\t\t\tob_b_r <= n_rnd_diff_i;\n"
|
"\t\t\t\tob_b_r <= n_rnd_diff_i;\n"
|
"\t\t\t\tob_b_i <= rnd_diff_r;\n"
|
"\t\t\t\tob_b_i <= rnd_diff_r;\n"
|
"\t\t\tend\n"
|
"\t\t\tend\n"
|
"\t\tend\n\n");
|
"\t\tend\n\n");
|
fprintf(fp,
|
fprintf(fp,
|
"\talways\t@(posedge i_clk)\n"
|
"\talways\t@(posedge i_clk)\n"
|
"\t\tif (i_ce)\n"
|
"\t\tif (i_ce)\n"
|
"\t\tbegin // In sequence, clock = 3\n"
|
"\t\tbegin // In sequence, clock = 3\n"
|
"\t\t\tif (pipeline[3])\n"
|
"\t\t\tif (pipeline[3])\n"
|
"\t\t\tbegin\n"
|
"\t\t\tbegin\n"
|
"\t\t\t\tomem <= ob_b;\n"
|
"\t\t\t\tomem <= ob_b;\n"
|
"\t\t\t\to_data <= ob_a;\n"
|
"\t\t\t\to_data <= ob_a;\n"
|
"\t\t\tend else\n"
|
"\t\t\tend else\n"
|
"\t\t\t\to_data <= omem;\n"
|
"\t\t\t\to_data <= omem;\n"
|
"\t\tend\n\n");
|
"\t\tend\n\n");
|
|
|
fprintf(fp,
|
fprintf(fp,
|
"\t// Don\'t forget in the sync check that we are running\n"
|
"\t// Don\'t forget in the sync check that we are running\n"
|
"\t// at two clocks per sample. Thus we need to\n"
|
"\t// at two clocks per sample. Thus we need to\n"
|
"\t// produce a sync every 2^(LGWIDTH-1) clocks.\n"
|
"\t// produce a sync every 2^(LGWIDTH-1) clocks.\n"
|
"\talways\t@(posedge i_clk)\n"
|
"\talways\t@(posedge i_clk)\n"
|
"\t\tif (i_ce)\n"
|
"\t\tif (i_ce)\n"
|
"\t\t\to_sync <= &(~iaddr[(LGWIDTH-2):3]) && (iaddr[2:0] == 3'b101);\n");
|
"\t\t\to_sync <= &(~iaddr[(LGWIDTH-2):3]) && (iaddr[2:0] == 3'b101);\n");
|
fprintf(fp, "endmodule\n");
|
fprintf(fp, "endmodule\n");
|
}
|
}
|
|
|
void build_dblstage(const char *fname, ROUND_T rounding) {
|
void build_dblstage(const char *fname, ROUND_T rounding) {
|
FILE *fp = fopen(fname, "w");
|
FILE *fp = fopen(fname, "w");
|
if (NULL == fp) {
|
if (NULL == fp) {
|
fprintf(stderr, "Could not open \'%s\' for writing\n", fname);
|
fprintf(stderr, "Could not open \'%s\' for writing\n", fname);
|
perror("O/S Err was:");
|
perror("O/S Err was:");
|
return;
|
return;
|
}
|
}
|
|
|
const char *rnd_string;
|
const char *rnd_string;
|
if (rounding == RND_TRUNCATE)
|
if (rounding == RND_TRUNCATE)
|
rnd_string = "truncate";
|
rnd_string = "truncate";
|
else if (rounding == RND_FROMZERO)
|
else if (rounding == RND_FROMZERO)
|
rnd_string = "roundfromzero";
|
rnd_string = "roundfromzero";
|
else if (rounding == RND_HALFUP)
|
else if (rounding == RND_HALFUP)
|
rnd_string = "roundhalfup";
|
rnd_string = "roundhalfup";
|
else
|
else
|
rnd_string = "convround";
|
rnd_string = "convround";
|
|
|
|
|
fprintf(fp,
|
fprintf(fp,
|
"///////////////////////////////////////////////////////////////////////////\n"
|
"///////////////////////////////////////////////////////////////////////////\n"
|
"//\n"
|
"//\n"
|
"// Filename: dblstage.v\n"
|
"// Filename: dblstage.v\n"
|
"//\n"
|
"//\n"
|
"// Project: %s\n"
|
"// Project: %s\n"
|
"//\n"
|
"//\n"
|
"// Purpose: This is part of an FPGA implementation that will process\n"
|
"// Purpose: This is part of an FPGA implementation that will process\n"
|
"// the final stage of a decimate-in-frequency FFT, running\n"
|
"// the final stage of a decimate-in-frequency FFT, running\n"
|
"// through the data at two samples per clock. If you notice\n"
|
"// through the data at two samples per clock. If you notice\n"
|
"// from the derivation of an FFT, the only time both even and\n"
|
"// from the derivation of an FFT, the only time both even and\n"
|
"// odd samples are used at the same time is in this stage.\n"
|
"// odd samples are used at the same time is in this stage.\n"
|
"// Therefore, other than this stage and these twiddles, all of\n"
|
"// Therefore, other than this stage and these twiddles, all of\n"
|
"// the other stages can run two stages at a time at one sample\n"
|
"// the other stages can run two stages at a time at one sample\n"
|
"// per clock.\n"
|
"// per clock.\n"
|
"//\n"
|
"//\n"
|
"// In this implementation, the output is valid one clock after\n"
|
"// In this implementation, the output is valid one clock after\n"
|
"// the input is valid. The output also accumulates one bit\n"
|
"// the input is valid. The output also accumulates one bit\n"
|
"// above and beyond the number of bits in the input.\n"
|
"// above and beyond the number of bits in the input.\n"
|
"// \n"
|
"// \n"
|
"// i_clk A system clock\n"
|
"// i_clk A system clock\n"
|
"// i_rst A synchronous reset\n"
|
"// i_rst A synchronous reset\n"
|
"// i_ce Circuit enable--nothing happens unless this line is high\n"
|
"// i_ce Circuit enable--nothing happens unless this line is high\n"
|
"// i_sync A synchronization signal, high once per FFT at the start\n"
|
"// i_sync A synchronization signal, high once per FFT at the start\n"
|
"// i_left The first (even) complex sample input. The higher order\n"
|
"// i_left The first (even) complex sample input. The higher order\n"
|
"// bits contain the real portion, low order bits the\n"
|
"// bits contain the real portion, low order bits the\n"
|
"// imaginary portion, all in two\'s complement.\n"
|
"// imaginary portion, all in two\'s complement.\n"
|
"// i_right The next (odd) complex sample input, same format as\n"
|
"// i_right The next (odd) complex sample input, same format as\n"
|
"// i_left.\n"
|
"// i_left.\n"
|
"// o_left The first (even) complex output.\n"
|
"// o_left The first (even) complex output.\n"
|
"// o_right The next (odd) complex output.\n"
|
"// o_right The next (odd) complex output.\n"
|
"// o_sync Output synchronization signal.\n"
|
"// o_sync Output synchronization signal.\n"
|
"//\n%s"
|
"//\n%s"
|
"//\n", prjname, creator);
|
"//\n", prjname, creator);
|
|
|
fprintf(fp, "%s", cpyleft);
|
fprintf(fp, "%s", cpyleft);
|
fprintf(fp,
|
fprintf(fp,
|
"module\tdblstage(i_clk, i_rst, i_ce, i_sync, i_left, i_right, o_left, o_right, o_sync);\n"
|
"module\tdblstage(i_clk, i_rst, i_ce, i_sync, i_left, i_right, o_left, o_right, o_sync);\n"
|
"\tparameter\tIWIDTH=16,OWIDTH=IWIDTH+1, SHIFT=0;\n"
|
"\tparameter\tIWIDTH=16,OWIDTH=IWIDTH+1, SHIFT=0;\n"
|
"\tinput\t\ti_clk, i_rst, i_ce, i_sync;\n"
|
"\tinput\t\ti_clk, i_rst, i_ce, i_sync;\n"
|
"\tinput\t\t[(2*IWIDTH-1):0]\ti_left, i_right;\n"
|
"\tinput\t\t[(2*IWIDTH-1):0]\ti_left, i_right;\n"
|
"\toutput\twire\t[(2*OWIDTH-1):0]\to_left, o_right;\n"
|
"\toutput\twire\t[(2*OWIDTH-1):0]\to_left, o_right;\n"
|
"\toutput\treg\t\t\to_sync;\n"
|
"\toutput\treg\t\t\to_sync;\n"
|
"\n");
|
"\n");
|
fprintf(fp,
|
fprintf(fp,
|
"\twire\tsigned\t[(IWIDTH-1):0]\ti_in_0r, i_in_0i, i_in_1r, i_in_1i;\n"
|
"\twire\tsigned\t[(IWIDTH-1):0]\ti_in_0r, i_in_0i, i_in_1r, i_in_1i;\n"
|
"\tassign\ti_in_0r = i_left[(2*IWIDTH-1):(IWIDTH)]; \n"
|
"\tassign\ti_in_0r = i_left[(2*IWIDTH-1):(IWIDTH)]; \n"
|
"\tassign\ti_in_0i = i_left[(IWIDTH-1):0]; \n"
|
"\tassign\ti_in_0i = i_left[(IWIDTH-1):0]; \n"
|
"\tassign\ti_in_1r = i_right[(2*IWIDTH-1):(IWIDTH)]; \n"
|
"\tassign\ti_in_1r = i_right[(2*IWIDTH-1):(IWIDTH)]; \n"
|
"\tassign\ti_in_1i = i_right[(IWIDTH-1):0]; \n"
|
"\tassign\ti_in_1i = i_right[(IWIDTH-1):0]; \n"
|
"\twire\t[(OWIDTH-1):0]\t\to_out_0r, o_out_0i,\n"
|
"\twire\t[(OWIDTH-1):0]\t\to_out_0r, o_out_0i,\n"
|
"\t\t\t\t\to_out_1r, o_out_1i;\n"
|
"\t\t\t\t\to_out_1r, o_out_1i;\n"
|
"\n"
|
"\n"
|
"\n"
|
"\n"
|
"\t// Handle a potential rounding situation, when IWIDTH>=OWIDTH.\n"
|
"\t// Handle a potential rounding situation, when IWIDTH>=OWIDTH.\n"
|
"\n"
|
"\n"
|
"\n");
|
"\n");
|
fprintf(fp,
|
fprintf(fp,
|
"\t// Don't forget that we accumulate a bit by adding two values\n"
|
"\t// Don't forget that we accumulate a bit by adding two values\n"
|
"\t// together. Therefore our intermediate value must have one more\n"
|
"\t// together. Therefore our intermediate value must have one more\n"
|
"\t// bit than the two originals.\n"
|
"\t// bit than the two originals.\n"
|
"\twire\tsigned\t[(IWIDTH):0]\trnd_in_0r, rnd_in_0i, rnd_in_1r, rnd_in_1i;\n\n");
|
"\twire\tsigned\t[(IWIDTH):0]\trnd_in_0r, rnd_in_0i, rnd_in_1r, rnd_in_1i;\n\n");
|
fprintf(fp,
|
fprintf(fp,
|
"\t%s\t#(IWIDTH+1,OWIDTH,SHIFT)\tdo_rnd_0r(i_clk, i_ce,\n"
|
"\t%s\t#(IWIDTH+1,OWIDTH,SHIFT)\tdo_rnd_0r(i_clk, i_ce,\n"
|
"\t\t\t\t\t\t\t\trnd_in_0r, o_out_0r);\n\n", rnd_string);
|
"\t\t\t\t\t\t\t\trnd_in_0r, o_out_0r);\n\n", rnd_string);
|
fprintf(fp,
|
fprintf(fp,
|
"\t%s\t#(IWIDTH+1,OWIDTH,SHIFT)\tdo_rnd_0i(i_clk, i_ce,\n"
|
"\t%s\t#(IWIDTH+1,OWIDTH,SHIFT)\tdo_rnd_0i(i_clk, i_ce,\n"
|
"\t\t\t\t\t\t\t\trnd_in_0i, o_out_0i);\n\n", rnd_string);
|
"\t\t\t\t\t\t\t\trnd_in_0i, o_out_0i);\n\n", rnd_string);
|
fprintf(fp,
|
fprintf(fp,
|
"\t%s\t#(IWIDTH+1,OWIDTH,SHIFT)\tdo_rnd_1r(i_clk, i_ce,\n"
|
"\t%s\t#(IWIDTH+1,OWIDTH,SHIFT)\tdo_rnd_1r(i_clk, i_ce,\n"
|
"\t\t\t\t\t\t\t\trnd_in_1r, o_out_1r);\n\n", rnd_string);
|
"\t\t\t\t\t\t\t\trnd_in_1r, o_out_1r);\n\n", rnd_string);
|
fprintf(fp,
|
fprintf(fp,
|
"\t%s\t#(IWIDTH+1,OWIDTH,SHIFT)\tdo_rnd_1i(i_clk, i_ce,\n"
|
"\t%s\t#(IWIDTH+1,OWIDTH,SHIFT)\tdo_rnd_1i(i_clk, i_ce,\n"
|
"\t\t\t\t\t\t\t\trnd_in_1i, o_out_1i);\n\n", rnd_string);
|
"\t\t\t\t\t\t\t\trnd_in_1i, o_out_1i);\n\n", rnd_string);
|
|
|
fprintf(fp,
|
fprintf(fp,
|
"\treg\twait_for_sync, rnd_sync;\n"
|
"\treg\twait_for_sync, rnd_sync;\n"
|
"\n"
|
"\n"
|
"\talways @(posedge i_clk)\n"
|
"\talways @(posedge i_clk)\n"
|
"\t\tif (i_rst)\n"
|
"\t\tif (i_rst)\n"
|
"\t\tbegin\n"
|
"\t\tbegin\n"
|
"\t\t\trnd_sync <= 1'b0;\n"
|
"\t\t\trnd_sync <= 1'b0;\n"
|
"\t\t\to_sync <= 1'b0;\n"
|
"\t\t\to_sync <= 1'b0;\n"
|
"\t\t\twait_for_sync <= 1'b1;\n"
|
"\t\t\twait_for_sync <= 1'b1;\n"
|
"\t\tend else if ((i_ce)&&((~wait_for_sync)||(i_sync)))\n"
|
"\t\tend else if ((i_ce)&&((~wait_for_sync)||(i_sync)))\n"
|
"\t\tbegin\n"
|
"\t\tbegin\n"
|
"\t\t\twait_for_sync <= 1'b0;\n"
|
"\t\t\twait_for_sync <= 1'b0;\n"
|
"\t\t\t//\n"
|
"\t\t\t//\n"
|
"\t\t\trnd_in_0r <= i_in_0r + i_in_1r;\n"
|
"\t\t\trnd_in_0r <= i_in_0r + i_in_1r;\n"
|
"\t\t\trnd_in_0i <= i_in_0i + i_in_1i;\n"
|
"\t\t\trnd_in_0i <= i_in_0i + i_in_1i;\n"
|
"\t\t\t//\n"
|
"\t\t\t//\n"
|
"\t\t\trnd_in_1r <= i_in_0r - i_in_1r;\n"
|
"\t\t\trnd_in_1r <= i_in_0r - i_in_1r;\n"
|
"\t\t\trnd_in_1i <= i_in_0i - i_in_1i;\n"
|
"\t\t\trnd_in_1i <= i_in_0i - i_in_1i;\n"
|
"\t\t\t//\n"
|
"\t\t\t//\n"
|
"\t\t\trnd_sync <= i_sync;\n"
|
"\t\t\trnd_sync <= i_sync;\n"
|
"\t\t\to_sync <= rnd_sync;\n"
|
"\t\t\to_sync <= rnd_sync;\n"
|
"\t\tend\n"
|
"\t\tend\n"
|
"\n"
|
"\n"
|
"\tassign\to_left = { o_out_0r, o_out_0i };\n"
|
"\tassign\to_left = { o_out_0r, o_out_0i };\n"
|
"\tassign\to_right = { o_out_1r, o_out_1i };\n"
|
"\tassign\to_right = { o_out_1r, o_out_1i };\n"
|
"\n"
|
"\n"
|
"endmodule\n");
|
"endmodule\n");
|
fclose(fp);
|
fclose(fp);
|
}
|
}
|
|
|
void build_multiply(const char *fname) {
|
void build_multiply(const char *fname) {
|
FILE *fp = fopen(fname, "w");
|
FILE *fp = fopen(fname, "w");
|
if (NULL == fp) {
|
if (NULL == fp) {
|
fprintf(stderr, "Could not open \'%s\' for writing\n", fname);
|
fprintf(stderr, "Could not open \'%s\' for writing\n", fname);
|
perror("O/S Err was:");
|
perror("O/S Err was:");
|
return;
|
return;
|
}
|
}
|
|
|
fprintf(fp,
|
fprintf(fp,
|
"///////////////////////////////////////////////////////////////////////////\n"
|
"///////////////////////////////////////////////////////////////////////////\n"
|
"//\n"
|
"//\n"
|
"// Filename: shiftaddmpy.v\n"
|
"// Filename: shiftaddmpy.v\n"
|
"//\n"
|
"//\n"
|
"// Project: %s\n"
|
"// Project: %s\n"
|
"//\n"
|
"//\n"
|
"// Purpose: A portable shift and add multiply.\n"
|
"// Purpose: A portable shift and add multiply.\n"
|
"//\n"
|
"//\n"
|
"// While both Xilinx and Altera will offer single clock \n"
|
"// While both Xilinx and Altera will offer single clock \n"
|
"// multiplies, this simple approach will multiply two numbers\n"
|
"// multiplies, this simple approach will multiply two numbers\n"
|
"// on any architecture. The result maintains the full width\n"
|
"// on any architecture. The result maintains the full width\n"
|
"// of the multiply, there are no extra stuff bits, no rounding,\n"
|
"// of the multiply, there are no extra stuff bits, no rounding,\n"
|
"// no shifted bits, etc.\n"
|
"// no shifted bits, etc.\n"
|
"//\n"
|
"//\n"
|
"// Further, for those applications that can support it, this\n"
|
"// Further, for those applications that can support it, this\n"
|
"// multiply is pipelined and will produce one answer per clock.\n"
|
"// multiply is pipelined and will produce one answer per clock.\n"
|
"//\n"
|
"//\n"
|
"// For minimal processing delay, make the first parameter\n"
|
"// For minimal processing delay, make the first parameter\n"
|
"// the one with the least bits, so that AWIDTH <= BWIDTH.\n"
|
"// the one with the least bits, so that AWIDTH <= BWIDTH.\n"
|
"//\n"
|
"//\n"
|
"// The processing delay in this multiply is (AWIDTH+1) cycles.\n"
|
"// The processing delay in this multiply is (AWIDTH+1) cycles.\n"
|
"// That is, if the data is present on the input at clock t=0,\n"
|
"// That is, if the data is present on the input at clock t=0,\n"
|
"// the result will be present on the output at time t=AWIDTH+1;\n"
|
"// the result will be present on the output at time t=AWIDTH+1;\n"
|
"//\n"
|
"//\n"
|
"//\n%s"
|
"//\n%s"
|
"//\n", prjname, creator);
|
"//\n", prjname, creator);
|
|
|
fprintf(fp, "%s", cpyleft);
|
fprintf(fp, "%s", cpyleft);
|
fprintf(fp,
|
fprintf(fp,
|
"module shiftaddmpy(i_clk, i_ce, i_a, i_b, o_r);\n"
|
"module shiftaddmpy(i_clk, i_ce, i_a, i_b, o_r);\n"
|
"\tparameter\tAWIDTH=16,BWIDTH=AWIDTH;\n"
|
"\tparameter\tAWIDTH=16,BWIDTH=AWIDTH;\n"
|
"\tinput\t\t\t\t\ti_clk, i_ce;\n"
|
"\tinput\t\t\t\t\ti_clk, i_ce;\n"
|
"\tinput\t\t[(AWIDTH-1):0]\t\ti_a;\n"
|
"\tinput\t\t[(AWIDTH-1):0]\t\ti_a;\n"
|
"\tinput\t\t[(BWIDTH-1):0]\t\ti_b;\n"
|
"\tinput\t\t[(BWIDTH-1):0]\t\ti_b;\n"
|
"\toutput\treg\t[(AWIDTH+BWIDTH-1):0]\to_r;\n"
|
"\toutput\treg\t[(AWIDTH+BWIDTH-1):0]\to_r;\n"
|
"\n"
|
"\n"
|
"\treg\t[(AWIDTH-1):0]\tu_a;\n"
|
"\treg\t[(AWIDTH-1):0]\tu_a;\n"
|
"\treg\t[(BWIDTH-1):0]\tu_b;\n"
|
"\treg\t[(BWIDTH-1):0]\tu_b;\n"
|
"\treg\t\t\tsgn;\n"
|
"\treg\t\t\tsgn;\n"
|
"\n"
|
"\n"
|
"\treg\t[(AWIDTH-2):0]\t\tr_a[0:(AWIDTH-1)];\n"
|
"\treg\t[(AWIDTH-2):0]\t\tr_a[0:(AWIDTH-1)];\n"
|
"\treg\t[(AWIDTH+BWIDTH-2):0]\tr_b[0:(AWIDTH-1)];\n"
|
"\treg\t[(AWIDTH+BWIDTH-2):0]\tr_b[0:(AWIDTH-1)];\n"
|
"\treg\t\t\t\tr_s[0:(AWIDTH-1)];\n"
|
"\treg\t\t\t\tr_s[0:(AWIDTH-1)];\n"
|
"\treg\t[(AWIDTH+BWIDTH-1):0]\tacc[0:(AWIDTH-1)];\n"
|
"\treg\t[(AWIDTH+BWIDTH-1):0]\tacc[0:(AWIDTH-1)];\n"
|
"\tgenvar k;\n"
|
"\tgenvar k;\n"
|
"\n"
|
"\n"
|
"\t// If we were forced to stay within two\'s complement arithmetic,\n"
|
"\t// If we were forced to stay within two\'s complement arithmetic,\n"
|
"\t// taking the absolute value here would require an additional bit.\n"
|
"\t// taking the absolute value here would require an additional bit.\n"
|
"\t// However, because our results are now unsigned, we can stay\n"
|
"\t// However, because our results are now unsigned, we can stay\n"
|
"\t// within the number of bits given (for now).\n"
|
"\t// within the number of bits given (for now).\n"
|
"\talways @(posedge i_clk)\n"
|
"\talways @(posedge i_clk)\n"
|
"\t\tif (i_ce)\n"
|
"\t\tif (i_ce)\n"
|
"\t\tbegin\n"
|
"\t\tbegin\n"
|
"\t\t\tu_a <= (i_a[AWIDTH-1])?(-i_a):(i_a);\n"
|
"\t\t\tu_a <= (i_a[AWIDTH-1])?(-i_a):(i_a);\n"
|
"\t\t\tu_b <= (i_b[BWIDTH-1])?(-i_b):(i_b);\n"
|
"\t\t\tu_b <= (i_b[BWIDTH-1])?(-i_b):(i_b);\n"
|
"\t\t\tsgn <= i_a[AWIDTH-1] ^ i_b[BWIDTH-1];\n"
|
"\t\t\tsgn <= i_a[AWIDTH-1] ^ i_b[BWIDTH-1];\n"
|
"\t\tend\n"
|
"\t\tend\n"
|
"\n"
|
"\n"
|
"\talways @(posedge i_clk)\n"
|
"\talways @(posedge i_clk)\n"
|
"\t\tif (i_ce)\n"
|
"\t\tif (i_ce)\n"
|
"\t\tbegin\n"
|
"\t\tbegin\n"
|
"\t\t\tacc[0] <= (u_a[0]) ? { {(AWIDTH){1'b0}}, u_b }\n"
|
"\t\t\tacc[0] <= (u_a[0]) ? { {(AWIDTH){1'b0}}, u_b }\n"
|
"\t\t\t\t\t: {(AWIDTH+BWIDTH){1'b0}};\n"
|
"\t\t\t\t\t: {(AWIDTH+BWIDTH){1'b0}};\n"
|
"\t\t\tr_a[0] <= { u_a[(AWIDTH-1):1] };\n"
|
"\t\t\tr_a[0] <= { u_a[(AWIDTH-1):1] };\n"
|
"\t\t\tr_b[0] <= { {(AWIDTH-1){1'b0}}, u_b };\n"
|
"\t\t\tr_b[0] <= { {(AWIDTH-1){1'b0}}, u_b };\n"
|
"\t\t\tr_s[0] <= sgn; // The final sign, needs to be preserved\n"
|
"\t\t\tr_s[0] <= sgn; // The final sign, needs to be preserved\n"
|
"\t\tend\n"
|
"\t\tend\n"
|
"\n"
|
"\n"
|
"\tgenerate\n"
|
"\tgenerate\n"
|
"\tfor(k=0; k<AWIDTH-1; k=k+1)\n"
|
"\tfor(k=0; k<AWIDTH-1; k=k+1)\n"
|
"\tbegin\n"
|
"\tbegin\n"
|
"\t\talways @(posedge i_clk)\n"
|
"\t\talways @(posedge i_clk)\n"
|
"\t\tif (i_ce)\n"
|
"\t\tif (i_ce)\n"
|
"\t\tbegin\n"
|
"\t\tbegin\n"
|
"\t\t\tacc[k+1] <= acc[k] + ((r_a[k][0]) ? {r_b[k],1'b0}:0);\n"
|
"\t\t\tacc[k+1] <= acc[k] + ((r_a[k][0]) ? {r_b[k],1'b0}:0);\n"
|
"\t\t\tr_a[k+1] <= { 1'b0, r_a[k][(AWIDTH-2):1] };\n"
|
"\t\t\tr_a[k+1] <= { 1'b0, r_a[k][(AWIDTH-2):1] };\n"
|
"\t\t\tr_b[k+1] <= { r_b[k][(AWIDTH+BWIDTH-3):0], 1'b0};\n"
|
"\t\t\tr_b[k+1] <= { r_b[k][(AWIDTH+BWIDTH-3):0], 1'b0};\n"
|
"\t\t\tr_s[k+1] <= r_s[k];\n"
|
"\t\t\tr_s[k+1] <= r_s[k];\n"
|
"\t\tend\n"
|
"\t\tend\n"
|
"\tend\n"
|
"\tend\n"
|
"\tendgenerate\n"
|
"\tendgenerate\n"
|
"\n"
|
"\n"
|
"\talways @(posedge i_clk)\n"
|
"\talways @(posedge i_clk)\n"
|
"\t\tif (i_ce)\n"
|
"\t\tif (i_ce)\n"
|
"\t\t\to_r <= (r_s[AWIDTH-1]) ? (-acc[AWIDTH-1]) : acc[AWIDTH-1];\n"
|
"\t\t\to_r <= (r_s[AWIDTH-1]) ? (-acc[AWIDTH-1]) : acc[AWIDTH-1];\n"
|
"\n"
|
"\n"
|
"endmodule\n");
|
"endmodule\n");
|
|
|
fclose(fp);
|
fclose(fp);
|
}
|
}
|
|
|
void build_dblreverse(const char *fname) {
|
void build_dblreverse(const char *fname) {
|
FILE *fp = fopen(fname, "w");
|
FILE *fp = fopen(fname, "w");
|
if (NULL == fp) {
|
if (NULL == fp) {
|
fprintf(stderr, "Could not open \'%s\' for writing\n", fname);
|
fprintf(stderr, "Could not open \'%s\' for writing\n", fname);
|
perror("O/S Err was:");
|
perror("O/S Err was:");
|
return;
|
return;
|
}
|
}
|
|
|
fprintf(fp,
|
fprintf(fp,
|
"///////////////////////////////////////////////////////////////////////////\n"
|
"///////////////////////////////////////////////////////////////////////////\n"
|
"//\n"
|
"//\n"
|
"// Filename: dblreverse.v\n"
|
"// Filename: dblreverse.v\n"
|
"//\n"
|
"//\n"
|
"// Project: %s\n"
|
"// Project: %s\n"
|
"//\n"
|
"//\n"
|
"// Purpose: This module bitreverses a pipelined FFT input. Operation is\n"
|
"// Purpose: This module bitreverses a pipelined FFT input. Operation is\n"
|
"// expected as follows:\n"
|
"// expected as follows:\n"
|
"//\n"
|
"//\n"
|
"// i_clk A running clock at whatever system speed is offered.\n"
|
"// i_clk A running clock at whatever system speed is offered.\n"
|
"// i_rst A synchronous reset signal, that resets all internals\n"
|
"// i_rst A synchronous reset signal, that resets all internals\n"
|
"// i_ce If this is one, one input is consumed and an output\n"
|
"// i_ce If this is one, one input is consumed and an output\n"
|
"// is produced.\n"
|
"// is produced.\n"
|
"// i_in_0, i_in_1\n"
|
"// i_in_0, i_in_1\n"
|
"// Two inputs to be consumed, each of width WIDTH.\n"
|
"// Two inputs to be consumed, each of width WIDTH.\n"
|
"// o_out_0, o_out_1\n"
|
"// o_out_0, o_out_1\n"
|
"// Two of the bitreversed outputs, also of the same\n"
|
"// Two of the bitreversed outputs, also of the same\n"
|
"// width, WIDTH. Of course, there is a delay from the\n"
|
"// width, WIDTH. Of course, there is a delay from the\n"
|
"// first input to the first output. For this purpose,\n"
|
"// first input to the first output. For this purpose,\n"
|
"// o_sync is present.\n"
|
"// o_sync is present.\n"
|
"// o_sync This will be a 1'b1 for the first value in any block.\n"
|
"// o_sync This will be a 1'b1 for the first value in any block.\n"
|
"// Following a reset, this will only become 1'b1 once\n"
|
"// Following a reset, this will only become 1'b1 once\n"
|
"// the data has been loaded and is now valid. After that,\n"
|
"// the data has been loaded and is now valid. After that,\n"
|
"// all outputs will be valid.\n"
|
"// all outputs will be valid.\n"
|
"//\n%s"
|
"//\n%s"
|
"//\n", prjname, creator);
|
"//\n", prjname, creator);
|
fprintf(fp, "%s", cpyleft);
|
fprintf(fp, "%s", cpyleft);
|
fprintf(fp,
|
fprintf(fp,
|
"\n\n"
|
"\n\n"
|
"//\n"
|
"//\n"
|
"// How do we do bit reversing at two smples per clock? Can we separate out\n"
|
"// How do we do bit reversing at two smples per clock? Can we separate out\n"
|
"// our work into eight memory banks, writing two banks at once and reading\n"
|
"// our work into eight memory banks, writing two banks at once and reading\n"
|
"// another two banks in the same clock?\n"
|
"// another two banks in the same clock?\n"
|
"//\n"
|
"//\n"
|
"// mem[00xxx0] = s_0[n]\n"
|
"// mem[00xxx0] = s_0[n]\n"
|
"// mem[00xxx1] = s_1[n]\n"
|
"// mem[00xxx1] = s_1[n]\n"
|
"// o_0[n] = mem[10xxx0]\n"
|
"// o_0[n] = mem[10xxx0]\n"
|
"// o_1[n] = mem[11xxx0]\n"
|
"// o_1[n] = mem[11xxx0]\n"
|
"// ...\n"
|
"// ...\n"
|
"// mem[01xxx0] = s_0[m]\n"
|
"// mem[01xxx0] = s_0[m]\n"
|
"// mem[01xxx1] = s_1[m]\n"
|
"// mem[01xxx1] = s_1[m]\n"
|
"// o_0[m] = mem[10xxx1]\n"
|
"// o_0[m] = mem[10xxx1]\n"
|
"// o_1[m] = mem[11xxx1]\n"
|
"// o_1[m] = mem[11xxx1]\n"
|
"// ...\n"
|
"// ...\n"
|
"// mem[10xxx0] = s_0[n]\n"
|
"// mem[10xxx0] = s_0[n]\n"
|
"// mem[10xxx1] = s_1[n]\n"
|
"// mem[10xxx1] = s_1[n]\n"
|
"// o_0[n] = mem[00xxx0]\n"
|
"// o_0[n] = mem[00xxx0]\n"
|
"// o_1[n] = mem[01xxx0]\n"
|
"// o_1[n] = mem[01xxx0]\n"
|
"// ...\n"
|
"// ...\n"
|
"// mem[11xxx0] = s_0[m]\n"
|
"// mem[11xxx0] = s_0[m]\n"
|
"// mem[11xxx1] = s_1[m]\n"
|
"// mem[11xxx1] = s_1[m]\n"
|
"// o_0[m] = mem[00xxx1]\n"
|
"// o_0[m] = mem[00xxx1]\n"
|
"// o_1[m] = mem[01xxx1]\n"
|
"// o_1[m] = mem[01xxx1]\n"
|
"// ...\n"
|
"// ...\n"
|
"//\n"
|
"//\n"
|
"// The answer is that, yes we can but: we need to use four memory banks\n"
|
"// The answer is that, yes we can but: we need to use four memory banks\n"
|
"// to do it properly. These four banks are defined by the two bits\n"
|
"// to do it properly. These four banks are defined by the two bits\n"
|
"// that determine the top and bottom of the correct address. Larger\n"
|
"// that determine the top and bottom of the correct address. Larger\n"
|
"// FFT\'s would require more memories.\n"
|
"// FFT\'s would require more memories.\n"
|
"//\n"
|
"//\n"
|
"//\n");
|
"//\n");
|
fprintf(fp,
|
fprintf(fp,
|
"module dblreverse(i_clk, i_rst, i_ce, i_in_0, i_in_1,\n"
|
"module dblreverse(i_clk, i_rst, i_ce, i_in_0, i_in_1,\n"
|
"\t\to_out_0, o_out_1, o_sync);\n"
|
"\t\to_out_0, o_out_1, o_sync);\n"
|
"\tparameter\t\t\tLGSIZE=4, WIDTH=24;\n"
|
"\tparameter\t\t\tLGSIZE=4, WIDTH=24;\n"
|
"\tinput\t\t\t\ti_clk, i_rst, i_ce;\n"
|
"\tinput\t\t\t\ti_clk, i_rst, i_ce;\n"
|
"\tinput\t\t[(2*WIDTH-1):0]\ti_in_0, i_in_1;\n"
|
"\tinput\t\t[(2*WIDTH-1):0]\ti_in_0, i_in_1;\n"
|
"\toutput\treg\t[(2*WIDTH-1):0]\to_out_0, o_out_1;\n"
|
"\toutput\treg\t[(2*WIDTH-1):0]\to_out_0, o_out_1;\n"
|
"\toutput\treg\t\t\to_sync;\n"
|
"\toutput\treg\t\t\to_sync;\n"
|
"\n"
|
"\n"
|
"\treg\tin_reset;\n"
|
"\treg\tin_reset;\n"
|
"\treg\t[(LGSIZE):0]\tiaddr;\n"
|
"\treg\t[(LGSIZE):0]\tiaddr;\n"
|
"\treg\t[(2*WIDTH-1):0]\tmem_0e [0:((1<<(LGSIZE-1))-1)];\n"
|
"\treg\t[(2*WIDTH-1):0]\tmem_0e [0:((1<<(LGSIZE-1))-1)];\n"
|
"\treg\t[(2*WIDTH-1):0]\tmem_0o [0:((1<<(LGSIZE-1))-1)];\n"
|
"\treg\t[(2*WIDTH-1):0]\tmem_0o [0:((1<<(LGSIZE-1))-1)];\n"
|
"\treg\t[(2*WIDTH-1):0]\tmem_1e [0:((1<<(LGSIZE-1))-1)];\n"
|
"\treg\t[(2*WIDTH-1):0]\tmem_1e [0:((1<<(LGSIZE-1))-1)];\n"
|
"\treg\t[(2*WIDTH-1):0]\tmem_1o [0:((1<<(LGSIZE-1))-1)];\n"
|
"\treg\t[(2*WIDTH-1):0]\tmem_1o [0:((1<<(LGSIZE-1))-1)];\n"
|
"\n"
|
"\n"
|
"\twire\t[(2*LGSIZE-1):0] braddr;\n"
|
"\twire\t[(2*LGSIZE-1):0] braddr;\n"
|
"\tgenvar\tk;\n"
|
"\tgenvar\tk;\n"
|
"\tgenerate for(k=0; k<LGSIZE; k=k+1)\n"
|
"\tgenerate for(k=0; k<LGSIZE; k=k+1)\n"
|
"\t\tassign braddr[k] = iaddr[LGSIZE-1-k];\n"
|
"\t\tassign braddr[k] = iaddr[LGSIZE-1-k];\n"
|
"\tendgenerate\n"
|
"\tendgenerate\n"
|
"\n"
|
"\n"
|
"\talways @(posedge i_clk)\n"
|
"\talways @(posedge i_clk)\n"
|
"\t\tif (i_rst)\n"
|
"\t\tif (i_rst)\n"
|
"\t\tbegin\n"
|
"\t\tbegin\n"
|
"\t\t\tiaddr <= 0;\n"
|
"\t\t\tiaddr <= 0;\n"
|
"\t\t\tin_reset <= 1'b1;\n"
|
"\t\t\tin_reset <= 1'b1;\n"
|
"\t\tend else if (i_ce)\n"
|
"\t\tend else if (i_ce)\n"
|
"\t\tbegin\n"
|
"\t\tbegin\n"
|
"\t\t\tif (iaddr[(LGSIZE-1)])\n"
|
"\t\t\tif (iaddr[(LGSIZE-1)])\n"
|
"\t\t\tbegin\n"
|
"\t\t\tbegin\n"
|
"\t\t\t\tmem_1e[{iaddr[LGSIZE],iaddr[(LGSIZE-2):1]}] <= i_in_0;\n"
|
"\t\t\t\tmem_1e[{iaddr[LGSIZE],iaddr[(LGSIZE-2):1]}] <= i_in_0;\n"
|
"\t\t\t\tmem_1o[{iaddr[LGSIZE],iaddr[(LGSIZE-2):1]}] <= i_in_1;\n"
|
"\t\t\t\tmem_1o[{iaddr[LGSIZE],iaddr[(LGSIZE-2):1]}] <= i_in_1;\n"
|
"\t\t\tend else begin\n"
|
"\t\t\tend else begin\n"
|
"\t\t\t\tmem_0e[{iaddr[LGSIZE],iaddr[(LGSIZE-2):1]}] <= i_in_0;\n"
|
"\t\t\t\tmem_0e[{iaddr[LGSIZE],iaddr[(LGSIZE-2):1]}] <= i_in_0;\n"
|
"\t\t\t\tmem_0o[{iaddr[LGSIZE],iaddr[(LGSIZE-2):1]}] <= i_in_1;\n"
|
"\t\t\t\tmem_0o[{iaddr[LGSIZE],iaddr[(LGSIZE-2):1]}] <= i_in_1;\n"
|
"\t\t\tend\n"
|
"\t\t\tend\n"
|
"\t\t\tiaddr <= iaddr + 2;\n"
|
"\t\t\tiaddr <= iaddr + 2;\n"
|
"\t\t\tif (&iaddr[(LGSIZE-1):1])\n"
|
"\t\t\tif (&iaddr[(LGSIZE-1):1])\n"
|
"\t\t\t\tin_reset <= 1'b0;\n"
|
"\t\t\t\tin_reset <= 1'b0;\n"
|
"\t\t\tif (in_reset)\n"
|
"\t\t\tif (in_reset)\n"
|
"\t\t\tbegin\n"
|
"\t\t\tbegin\n"
|
"\t\t\t\to_out_0 <= {(2*WIDTH){1'b0}};\n"
|
"\t\t\t\to_out_0 <= {(2*WIDTH){1'b0}};\n"
|
"\t\t\t\to_out_1 <= {(2*WIDTH){1'b0}};\n"
|
"\t\t\t\to_out_1 <= {(2*WIDTH){1'b0}};\n"
|
"\t\t\t\to_sync <= 1'b0;\n"
|
"\t\t\t\to_sync <= 1'b0;\n"
|
"\t\t\tend else\n"
|
"\t\t\tend else\n"
|
"\t\t\tbegin\n"
|
"\t\t\tbegin\n"
|
"\t\t\t\tif (braddr[0])\n"
|
"\t\t\t\tif (braddr[0])\n"
|
"\t\t\t\tbegin\n"
|
"\t\t\t\tbegin\n"
|
"\t\t\t\t\to_out_0 <= mem_0o[{~iaddr[LGSIZE],braddr[(LGSIZE-2):1]}];\n"
|
"\t\t\t\t\to_out_0 <= mem_0o[{~iaddr[LGSIZE],braddr[(LGSIZE-2):1]}];\n"
|
"\t\t\t\t\to_out_1 <= mem_1o[{~iaddr[LGSIZE],braddr[(LGSIZE-2):1]}];\n"
|
"\t\t\t\t\to_out_1 <= mem_1o[{~iaddr[LGSIZE],braddr[(LGSIZE-2):1]}];\n"
|
"\t\t\t\tend else begin\n"
|
"\t\t\t\tend else begin\n"
|
"\t\t\t\t\to_out_0 <= mem_0e[{~iaddr[LGSIZE],braddr[(LGSIZE-2):1]}];\n"
|
"\t\t\t\t\to_out_0 <= mem_0e[{~iaddr[LGSIZE],braddr[(LGSIZE-2):1]}];\n"
|
"\t\t\t\t\to_out_1 <= mem_1e[{~iaddr[LGSIZE],braddr[(LGSIZE-2):1]}];\n"
|
"\t\t\t\t\to_out_1 <= mem_1e[{~iaddr[LGSIZE],braddr[(LGSIZE-2):1]}];\n"
|
"\t\t\t\tend\n"
|
"\t\t\t\tend\n"
|
"\t\t\t\to_sync <= ~(|iaddr[(LGSIZE-1):0]);\n"
|
"\t\t\t\to_sync <= ~(|iaddr[(LGSIZE-1):0]);\n"
|
"\t\t\tend\n"
|
"\t\t\tend\n"
|
"\t\tend\n"
|
"\t\tend\n"
|
"\n"
|
"\n"
|
"endmodule\n");
|
"endmodule\n");
|
|
|
fclose(fp);
|
fclose(fp);
|
}
|
}
|
|
|
void build_butterfly(const char *fname, int xtracbits, ROUND_T rounding) {
|
void build_butterfly(const char *fname, int xtracbits, ROUND_T rounding) {
|
FILE *fp = fopen(fname, "w");
|
FILE *fp = fopen(fname, "w");
|
if (NULL == fp) {
|
if (NULL == fp) {
|
fprintf(stderr, "Could not open \'%s\' for writing\n", fname);
|
fprintf(stderr, "Could not open \'%s\' for writing\n", fname);
|
perror("O/S Err was:");
|
perror("O/S Err was:");
|
return;
|
return;
|
}
|
}
|
const char *rnd_string;
|
const char *rnd_string;
|
if (rounding == RND_TRUNCATE)
|
if (rounding == RND_TRUNCATE)
|
rnd_string = "truncate";
|
rnd_string = "truncate";
|
else if (rounding == RND_FROMZERO)
|
else if (rounding == RND_FROMZERO)
|
rnd_string = "roundfromzero";
|
rnd_string = "roundfromzero";
|
else if (rounding == RND_HALFUP)
|
else if (rounding == RND_HALFUP)
|
rnd_string = "roundhalfup";
|
rnd_string = "roundhalfup";
|
else
|
else
|
rnd_string = "convround";
|
rnd_string = "convround";
|
|
|
fprintf(fp,
|
fprintf(fp,
|
"///////////////////////////////////////////////////////////////////////////\n"
|
"///////////////////////////////////////////////////////////////////////////\n"
|
"//\n"
|
"//\n"
|
"// Filename: butterfly.v\n"
|
"// Filename: butterfly.v\n"
|
"//\n"
|
"//\n"
|
"// Project: %s\n"
|
"// Project: %s\n"
|
"//\n"
|
"//\n"
|
"// Purpose: This routine caculates a butterfly for a decimation\n"
|
"// Purpose: This routine caculates a butterfly for a decimation\n"
|
"// in frequency version of an FFT. Specifically, given\n"
|
"// in frequency version of an FFT. Specifically, given\n"
|
"// complex Left and Right values together with a \n"
|
"// complex Left and Right values together with a \n"
|
"// coefficient, the output of this routine is given\n"
|
"// coefficient, the output of this routine is given\n"
|
"// by:\n"
|
"// by:\n"
|
"//\n"
|
"//\n"
|
"// L' = L + R\n"
|
"// L' = L + R\n"
|
"// R' = (L - R)*C\n"
|
"// R' = (L - R)*C\n"
|
"//\n"
|
"//\n"
|
"// The rest of the junk below handles timing (mostly),\n"
|
"// The rest of the junk below handles timing (mostly),\n"
|
"// to make certain that L' and R' reach the output at\n"
|
"// to make certain that L' and R' reach the output at\n"
|
"// the same clock. Further, just to make certain\n"
|
"// the same clock. Further, just to make certain\n"
|
"// that is the case, an 'aux' input exists. This\n"
|
"// that is the case, an 'aux' input exists. This\n"
|
"// aux value will come out of this routine synchronized\n"
|
"// aux value will come out of this routine synchronized\n"
|
"// to the values it came in with. (i.e., both L', R',\n"
|
"// to the values it came in with. (i.e., both L', R',\n"
|
"// and aux all have the same delay.) Hence, a caller\n"
|
"// and aux all have the same delay.) Hence, a caller\n"
|
"// of this routine may set aux on the first input with\n"
|
"// of this routine may set aux on the first input with\n"
|
"// valid data, and then wait to see aux set on the output\n"
|
"// valid data, and then wait to see aux set on the output\n"
|
"// to know when to find the first output with valid data.\n"
|
"// to know when to find the first output with valid data.\n"
|
"//\n"
|
"//\n"
|
"// All bits are preserved until the very last clock,\n"
|
"// All bits are preserved until the very last clock,\n"
|
"// where any more bits than OWIDTH will be quietly\n"
|
"// where any more bits than OWIDTH will be quietly\n"
|
"// discarded.\n"
|
"// discarded.\n"
|
"//\n"
|
"//\n"
|
"// This design features no overflow checking.\n"
|
"// This design features no overflow checking.\n"
|
"// \n"
|
"// \n"
|
"// Notes:\n"
|
"// Notes:\n"
|
"// CORDIC:\n"
|
"// CORDIC:\n"
|
"// Much as we would like, we can't use a cordic here.\n"
|
"// Much as we would like, we can't use a cordic here.\n"
|
"// The goal is to accomplish an FFT, as defined, and a\n"
|
"// The goal is to accomplish an FFT, as defined, and a\n"
|
"// CORDIC places a scale factor onto the data. Removing\n"
|
"// CORDIC places a scale factor onto the data. Removing\n"
|
"// the scale factor would cost a two multiplies, which\n"
|
"// the scale factor would cost a two multiplies, which\n"
|
"// is precisely what we are trying to avoid.\n"
|
"// is precisely what we are trying to avoid.\n"
|
"//\n"
|
"//\n"
|
"//\n"
|
"//\n"
|
"// 3-MULTIPLIES:\n"
|
"// 3-MULTIPLIES:\n"
|
"// It should also be possible to do this with three \n"
|
"// It should also be possible to do this with three \n"
|
"// multiplies and an extra two addition cycles. \n"
|
"// multiplies and an extra two addition cycles. \n"
|
"//\n"
|
"//\n"
|
"// We want\n"
|
"// We want\n"
|
"// R+I = (a + jb) * (c + jd)\n"
|
"// R+I = (a + jb) * (c + jd)\n"
|
"// R+I = (ac-bd) + j(ad+bc)\n"
|
"// R+I = (ac-bd) + j(ad+bc)\n"
|
"// We multiply\n"
|
"// We multiply\n"
|
"// P1 = ac\n"
|
"// P1 = ac\n"
|
"// P2 = bd\n"
|
"// P2 = bd\n"
|
"// P3 = (a+b)(c+d)\n"
|
"// P3 = (a+b)(c+d)\n"
|
"// Then \n"
|
"// Then \n"
|
"// R+I=(P1-P2)+j(P3-P2-P1)\n"
|
"// R+I=(P1-P2)+j(P3-P2-P1)\n"
|
"//\n"
|
"//\n"
|
"// WIDTHS:\n"
|
"// WIDTHS:\n"
|
"// On multiplying an X width number by an\n"
|
"// On multiplying an X width number by an\n"
|
"// Y width number, X>Y, the result should be (X+Y)\n"
|
"// Y width number, X>Y, the result should be (X+Y)\n"
|
"// bits, right?\n"
|
"// bits, right?\n"
|
"// -2^(X-1) <= a <= 2^(X-1) - 1\n"
|
"// -2^(X-1) <= a <= 2^(X-1) - 1\n"
|
"// -2^(Y-1) <= b <= 2^(Y-1) - 1\n"
|
"// -2^(Y-1) <= b <= 2^(Y-1) - 1\n"
|
"// (2^(Y-1)-1)*(-2^(X-1)) <= ab <= 2^(X-1)2^(Y-1)\n"
|
"// (2^(Y-1)-1)*(-2^(X-1)) <= ab <= 2^(X-1)2^(Y-1)\n"
|
"// -2^(X+Y-2)+2^(X-1) <= ab <= 2^(X+Y-2) <= 2^(X+Y-1) - 1\n"
|
"// -2^(X+Y-2)+2^(X-1) <= ab <= 2^(X+Y-2) <= 2^(X+Y-1) - 1\n"
|
"// -2^(X+Y-1) <= ab <= 2^(X+Y-1)-1\n"
|
"// -2^(X+Y-1) <= ab <= 2^(X+Y-1)-1\n"
|
"// YUP! But just barely. Do this and you'll really want\n"
|
"// YUP! But just barely. Do this and you'll really want\n"
|
"// to drop a bit, although you will risk overflow in so\n"
|
"// to drop a bit, although you will risk overflow in so\n"
|
"// doing.\n"
|
"// doing.\n"
|
"//\n%s"
|
"//\n%s"
|
"//\n", prjname, creator);
|
"//\n", prjname, creator);
|
fprintf(fp, "%s", cpyleft);
|
fprintf(fp, "%s", cpyleft);
|
|
|
fprintf(fp,
|
fprintf(fp,
|
"module\tbutterfly(i_clk, i_rst, i_ce, i_coef, i_left, i_right, i_aux,\n"
|
"module\tbutterfly(i_clk, i_rst, i_ce, i_coef, i_left, i_right, i_aux,\n"
|
"\t\to_left, o_right, o_aux);\n"
|
"\t\to_left, o_right, o_aux);\n"
|
"\t// Public changeable parameters ...\n"
|
"\t// Public changeable parameters ...\n"
|
"\tparameter IWIDTH=%d,CWIDTH=IWIDTH+%d,OWIDTH=IWIDTH+1;\n"
|
"\tparameter IWIDTH=%d,CWIDTH=IWIDTH+%d,OWIDTH=IWIDTH+1;\n"
|
"\t// Parameters specific to the core that should not be changed.\n"
|
"\t// Parameters specific to the core that should not be changed.\n"
|
"\tparameter MPYDELAY=%d'd%d, // (IWIDTH+1 < CWIDTH)?(IWIDTH+4):(CWIDTH+3),\n"
|
"\tparameter MPYDELAY=%d'd%d, // (IWIDTH+1 < CWIDTH)?(IWIDTH+4):(CWIDTH+3),\n"
|
"\t\t\tSHIFT=0;\n"
|
"\t\t\tSHIFT=0;\n"
|
"\t// The LGDELAY should be the base two log of the MPYDELAY. If\n"
|
"\t// The LGDELAY should be the base two log of the MPYDELAY. If\n"
|
"\t// this value is fractional, then round up to the nearest\n"
|
"\t// this value is fractional, then round up to the nearest\n"
|
"\t// integer: LGDELAY=ceil(log(MPYDELAY)/log(2));\n"
|
"\t// integer: LGDELAY=ceil(log(MPYDELAY)/log(2));\n"
|
"\tparameter\tLGDELAY=%d;\n"
|
"\tparameter\tLGDELAY=%d;\n"
|
"\tinput\t\ti_clk, i_rst, i_ce;\n"
|
"\tinput\t\ti_clk, i_rst, i_ce;\n"
|
"\tinput\t\t[(2*CWIDTH-1):0] i_coef;\n"
|
"\tinput\t\t[(2*CWIDTH-1):0] i_coef;\n"
|
"\tinput\t\t[(2*IWIDTH-1):0] i_left, i_right;\n"
|
"\tinput\t\t[(2*IWIDTH-1):0] i_left, i_right;\n"
|
"\tinput\t\ti_aux;\n"
|
"\tinput\t\ti_aux;\n"
|
"\toutput\twire [(2*OWIDTH-1):0] o_left, o_right;\n"
|
"\toutput\twire [(2*OWIDTH-1):0] o_left, o_right;\n"
|
"\toutput\treg o_aux;\n"
|
"\toutput\treg o_aux;\n"
|
"\n", 16, xtracbits, lgdelay(16,xtracbits),
|
"\n", 16, xtracbits, lgdelay(16,xtracbits),
|
bflydelay(16, xtracbits), lgdelay(16,xtracbits));
|
bflydelay(16, xtracbits), lgdelay(16,xtracbits));
|
fprintf(fp,
|
fprintf(fp,
|
"\twire\t[(OWIDTH-1):0] o_left_r, o_left_i, o_right_r, o_right_i;\n"
|
"\twire\t[(OWIDTH-1):0] o_left_r, o_left_i, o_right_r, o_right_i;\n"
|
"\n"
|
"\n"
|
"\treg\t[(2*IWIDTH-1):0]\tr_left, r_right;\n"
|
"\treg\t[(2*IWIDTH-1):0]\tr_left, r_right;\n"
|
"\treg\t\t\t\tr_aux, r_aux_2;\n"
|
"\treg\t\t\t\tr_aux, r_aux_2;\n"
|
"\treg\t[(2*CWIDTH-1):0]\tr_coef, r_coef_2;\n"
|
"\treg\t[(2*CWIDTH-1):0]\tr_coef, r_coef_2;\n"
|
"\twire\tsigned\t[(CWIDTH-1):0]\tr_coef_r, r_coef_i;\n"
|
"\twire\tsigned\t[(CWIDTH-1):0]\tr_coef_r, r_coef_i;\n"
|
"\tassign\tr_coef_r = r_coef_2[ (2*CWIDTH-1):(CWIDTH)];\n"
|
"\tassign\tr_coef_r = r_coef_2[ (2*CWIDTH-1):(CWIDTH)];\n"
|
"\tassign\tr_coef_i = r_coef_2[ ( CWIDTH-1):0];\n"
|
"\tassign\tr_coef_i = r_coef_2[ ( CWIDTH-1):0];\n"
|
"\twire\tsigned\t[(IWIDTH-1):0]\tr_left_r, r_left_i, r_right_r, r_right_i;\n"
|
"\twire\tsigned\t[(IWIDTH-1):0]\tr_left_r, r_left_i, r_right_r, r_right_i;\n"
|
"\tassign\tr_left_r = r_left[ (2*IWIDTH-1):(IWIDTH)];\n"
|
"\tassign\tr_left_r = r_left[ (2*IWIDTH-1):(IWIDTH)];\n"
|
"\tassign\tr_left_i = r_left[ (IWIDTH-1):0];\n"
|
"\tassign\tr_left_i = r_left[ (IWIDTH-1):0];\n"
|
"\tassign\tr_right_r = r_right[(2*IWIDTH-1):(IWIDTH)];\n"
|
"\tassign\tr_right_r = r_right[(2*IWIDTH-1):(IWIDTH)];\n"
|
"\tassign\tr_right_i = r_right[(IWIDTH-1):0];\n"
|
"\tassign\tr_right_i = r_right[(IWIDTH-1):0];\n"
|
"\n"
|
"\n"
|
"\treg\tsigned\t[(IWIDTH):0]\tr_sum_r, r_sum_i, r_dif_r, r_dif_i;\n"
|
"\treg\tsigned\t[(IWIDTH):0]\tr_sum_r, r_sum_i, r_dif_r, r_dif_i;\n"
|
"\n"
|
"\n"
|
"\treg [(LGDELAY-1):0] fifo_addr;\n"
|
"\treg [(LGDELAY-1):0] fifo_addr;\n"
|
"\twire [(LGDELAY-1):0] fifo_read_addr;\n"
|
"\twire [(LGDELAY-1):0] fifo_read_addr;\n"
|
"\tassign\tfifo_read_addr = fifo_addr - MPYDELAY;\n"
|
"\tassign\tfifo_read_addr = fifo_addr - MPYDELAY;\n"
|
"\treg [(2*IWIDTH+2):0] fifo_left [ 0:((1<<LGDELAY)-1)];\n"
|
"\treg [(2*IWIDTH+2):0] fifo_left [ 0:((1<<LGDELAY)-1)];\n"
|
"\treg\t\t\t\tovalid;\n"
|
"\treg\t\t\t\tovalid;\n"
|
"\n");
|
"\n");
|
fprintf(fp,
|
fprintf(fp,
|
"\t// Set up the input to the multiply\n"
|
"\t// Set up the input to the multiply\n"
|
"\talways @(posedge i_clk)\n"
|
"\talways @(posedge i_clk)\n"
|
"\t\tif (i_ce)\n"
|
"\t\tif (i_ce)\n"
|
"\t\tbegin\n"
|
"\t\tbegin\n"
|
"\t\t\t// One clock just latches the inputs\n"
|
"\t\t\t// One clock just latches the inputs\n"
|
"\t\t\tr_left <= i_left; // No change in # of bits\n"
|
"\t\t\tr_left <= i_left; // No change in # of bits\n"
|
"\t\t\tr_right <= i_right;\n"
|
"\t\t\tr_right <= i_right;\n"
|
"\t\t\tr_aux <= i_aux;\n"
|
"\t\t\tr_aux <= i_aux;\n"
|
"\t\t\tr_coef <= i_coef;\n"
|
"\t\t\tr_coef <= i_coef;\n"
|
"\t\t\t// Next clock adds/subtracts\n"
|
"\t\t\t// Next clock adds/subtracts\n"
|
"\t\t\tr_sum_r <= r_left_r + r_right_r; // Now IWIDTH+1 bits\n"
|
"\t\t\tr_sum_r <= r_left_r + r_right_r; // Now IWIDTH+1 bits\n"
|
"\t\t\tr_sum_i <= r_left_i + r_right_i;\n"
|
"\t\t\tr_sum_i <= r_left_i + r_right_i;\n"
|
"\t\t\tr_dif_r <= r_left_r - r_right_r;\n"
|
"\t\t\tr_dif_r <= r_left_r - r_right_r;\n"
|
"\t\t\tr_dif_i <= r_left_i - r_right_i;\n"
|
"\t\t\tr_dif_i <= r_left_i - r_right_i;\n"
|
"\t\t\t// Other inputs are simply delayed on second clock\n"
|
"\t\t\t// Other inputs are simply delayed on second clock\n"
|
"\t\t\tr_aux_2 <= r_aux;\n"
|
"\t\t\tr_aux_2 <= r_aux;\n"
|
"\t\t\tr_coef_2<= r_coef;\n"
|
"\t\t\tr_coef_2<= r_coef;\n"
|
"\t\tend\n"
|
"\t\tend\n"
|
"\n");
|
"\n");
|
fprintf(fp,
|
fprintf(fp,
|
"\t// Don\'t forget to record the even side, since it doesn\'t need\n"
|
"\t// Don\'t forget to record the even side, since it doesn\'t need\n"
|
"\t// to be multiplied, but yet we still need the results in sync\n"
|
"\t// to be multiplied, but yet we still need the results in sync\n"
|
"\t// with the answer when it is ready.\n"
|
"\t// with the answer when it is ready.\n"
|
"\talways @(posedge i_clk)\n"
|
"\talways @(posedge i_clk)\n"
|
"\t\tif (i_rst)\n"
|
"\t\tif (i_rst)\n"
|
"\t\tbegin\n"
|
"\t\tbegin\n"
|
"\t\t\tfifo_addr <= 0;\n"
|
"\t\t\tfifo_addr <= 0;\n"
|
"\t\t\tovalid <= 1'b0;\n"
|
"\t\t\tovalid <= 1'b0;\n"
|
"\t\tend else if (i_ce)\n"
|
"\t\tend else if (i_ce)\n"
|
"\t\tbegin\n"
|
"\t\tbegin\n"
|
"\t\t\t// Need to delay the sum side--nothing else happens\n"
|
"\t\t\t// Need to delay the sum side--nothing else happens\n"
|
"\t\t\t// to it, but it needs to stay synchronized with the\n"
|
"\t\t\t// to it, but it needs to stay synchronized with the\n"
|
"\t\t\t// right side.\n"
|
"\t\t\t// right side.\n"
|
"\t\t\tfifo_left[fifo_addr] <= { r_aux_2, r_sum_r, r_sum_i };\n"
|
"\t\t\tfifo_left[fifo_addr] <= { r_aux_2, r_sum_r, r_sum_i };\n"
|
"\t\t\tfifo_addr <= fifo_addr + 1;\n"
|
"\t\t\tfifo_addr <= fifo_addr + 1;\n"
|
"\n"
|
"\n"
|
"\t\t\tovalid <= (ovalid) || (fifo_addr > (MPYDELAY+1));\n"
|
"\t\t\tovalid <= (ovalid) || (fifo_addr > (MPYDELAY+1));\n"
|
"\t\tend\n"
|
"\t\tend\n"
|
"\n"
|
"\n"
|
"\twire\tsigned\t[(CWIDTH-1):0] ir_coef_r, ir_coef_i;\n"
|
"\twire\tsigned\t[(CWIDTH-1):0] ir_coef_r, ir_coef_i;\n"
|
"\tassign\tir_coef_r = r_coef_2[(2*CWIDTH-1):CWIDTH];\n"
|
"\tassign\tir_coef_r = r_coef_2[(2*CWIDTH-1):CWIDTH];\n"
|
"\tassign\tir_coef_i = r_coef_2[(CWIDTH-1):0];\n"
|
"\tassign\tir_coef_i = r_coef_2[(CWIDTH-1):0];\n"
|
"\twire\tsigned\t[((IWIDTH+2)+(CWIDTH+1)-1):0]\tp_one, p_two, p_three;\n"
|
"\twire\tsigned\t[((IWIDTH+2)+(CWIDTH+1)-1):0]\tp_one, p_two, p_three;\n"
|
"\n"
|
"\n"
|
"\n");
|
"\n");
|
fprintf(fp,
|
fprintf(fp,
|
"\t// Multiply output is always a width of the sum of the widths of\n"
|
"\t// Multiply output is always a width of the sum of the widths of\n"
|
"\t// the two inputs. ALWAYS. This is independent of the number of\n"
|
"\t// the two inputs. ALWAYS. This is independent of the number of\n"
|
"\t// bits in p_one, p_two, or p_three. These values needed to \n"
|
"\t// bits in p_one, p_two, or p_three. These values needed to \n"
|
"\t// accumulate a bit (or two) each. However, this approach to a\n"
|
"\t// accumulate a bit (or two) each. However, this approach to a\n"
|
"\t// three multiply complex multiply cannot increase the total\n"
|
"\t// three multiply complex multiply cannot increase the total\n"
|
"\t// number of bits in our final output. We\'ll take care of\n"
|
"\t// number of bits in our final output. We\'ll take care of\n"
|
"\t// dropping back down to the proper width, OWIDTH, in our routine\n"
|
"\t// dropping back down to the proper width, OWIDTH, in our routine\n"
|
"\t// below.\n"
|
"\t// below.\n"
|
"\n"
|
"\n"
|
"\n");
|
"\n");
|
fprintf(fp,
|
fprintf(fp,
|
"\t// We accomplish here \"Karatsuba\" multiplication. That is,\n"
|
"\t// We accomplish here \"Karatsuba\" multiplication. That is,\n"
|
"\t// by doing three multiplies we accomplish the work of four.\n"
|
"\t// by doing three multiplies we accomplish the work of four.\n"
|
"\t// Let\'s prove to ourselves that this works ... We wish to\n"
|
"\t// Let\'s prove to ourselves that this works ... We wish to\n"
|
"\t// multiply: (a+jb) * (c+jd), where a+jb is given by\n"
|
"\t// multiply: (a+jb) * (c+jd), where a+jb is given by\n"
|
"\t//\ta + jb = r_dif_r + j r_dif_i, and\n"
|
"\t//\ta + jb = r_dif_r + j r_dif_i, and\n"
|
"\t//\tc + jd = ir_coef_r + j ir_coef_i.\n"
|
"\t//\tc + jd = ir_coef_r + j ir_coef_i.\n"
|
"\t// We do this by calculating the intermediate products P1, P2,\n"
|
"\t// We do this by calculating the intermediate products P1, P2,\n"
|
"\t// and P3 as\n"
|
"\t// and P3 as\n"
|
"\t//\tP1 = ac\n"
|
"\t//\tP1 = ac\n"
|
"\t//\tP2 = bd\n"
|
"\t//\tP2 = bd\n"
|
"\t//\tP3 = (a + b) * (c + d)\n"
|
"\t//\tP3 = (a + b) * (c + d)\n"
|
"\t// and then complete our final answer with\n"
|
"\t// and then complete our final answer with\n"
|
"\t//\tac - bd = P1 - P2 (this checks)\n"
|
"\t//\tac - bd = P1 - P2 (this checks)\n"
|
"\t//\tad + bc = P3 - P2 - P1\n"
|
"\t//\tad + bc = P3 - P2 - P1\n"
|
"\t//\t = (ac + bc + ad + bd) - bd - ac\n"
|
"\t//\t = (ac + bc + ad + bd) - bd - ac\n"
|
"\t//\t = bc + ad (this checks)\n"
|
"\t//\t = bc + ad (this checks)\n"
|
"\n"
|
"\n"
|
"\n");
|
"\n");
|
fprintf(fp,
|
fprintf(fp,
|
"\t// This should really be based upon an IF, such as in\n"
|
"\t// This should really be based upon an IF, such as in\n"
|
"\t// if (IWIDTH < CWIDTH) then ...\n"
|
"\t// if (IWIDTH < CWIDTH) then ...\n"
|
"\t// However, this is the only (other) way I know to do it.\n"
|
"\t// However, this is the only (other) way I know to do it.\n"
|
"\tgenerate\n"
|
"\tgenerate\n"
|
"\tif (CWIDTH < IWIDTH+1)\n"
|
"\tif (CWIDTH < IWIDTH+1)\n"
|
"\tbegin\n"
|
"\tbegin\n"
|
"\t\twire\t[(CWIDTH):0]\tp3c_in;\n"
|
"\t\twire\t[(CWIDTH):0]\tp3c_in;\n"
|
"\t\twire\t[(IWIDTH+1):0]\tp3d_in;\n"
|
"\t\twire\t[(IWIDTH+1):0]\tp3d_in;\n"
|
"\t\tassign\tp3c_in = ir_coef_i + ir_coef_r;\n"
|
"\t\tassign\tp3c_in = ir_coef_i + ir_coef_r;\n"
|
"\t\tassign\tp3d_in = r_dif_r + r_dif_i;\n"
|
"\t\tassign\tp3d_in = r_dif_r + r_dif_i;\n"
|
"\n"
|
"\n"
|
"\t\t// We need to pad these first two multiplies by an extra\n"
|
"\t\t// We need to pad these first two multiplies by an extra\n"
|
"\t\t// bit just to keep them aligned with the third,\n"
|
"\t\t// bit just to keep them aligned with the third,\n"
|
"\t\t// simpler, multiply.\n"
|
"\t\t// simpler, multiply.\n"
|
"\t\tshiftaddmpy #(CWIDTH+1,IWIDTH+2) p1(i_clk, i_ce,\n"
|
"\t\tshiftaddmpy #(CWIDTH+1,IWIDTH+2) p1(i_clk, i_ce,\n"
|
"\t\t\t\t{ir_coef_r[CWIDTH-1],ir_coef_r},\n"
|
"\t\t\t\t{ir_coef_r[CWIDTH-1],ir_coef_r},\n"
|
"\t\t\t\t{r_dif_r[IWIDTH],r_dif_r}, p_one);\n"
|
"\t\t\t\t{r_dif_r[IWIDTH],r_dif_r}, p_one);\n"
|
"\t\tshiftaddmpy #(CWIDTH+1,IWIDTH+2) p2(i_clk, i_ce,\n"
|
"\t\tshiftaddmpy #(CWIDTH+1,IWIDTH+2) p2(i_clk, i_ce,\n"
|
"\t\t\t\t{ir_coef_i[CWIDTH-1],ir_coef_i},\n"
|
"\t\t\t\t{ir_coef_i[CWIDTH-1],ir_coef_i},\n"
|
"\t\t\t\t{r_dif_i[IWIDTH],r_dif_i}, p_two);\n"
|
"\t\t\t\t{r_dif_i[IWIDTH],r_dif_i}, p_two);\n"
|
"\t\tshiftaddmpy #(CWIDTH+1,IWIDTH+2) p3(i_clk, i_ce,\n"
|
"\t\tshiftaddmpy #(CWIDTH+1,IWIDTH+2) p3(i_clk, i_ce,\n"
|
"\t\t\t\tp3c_in, p3d_in, p_three);\n"
|
"\t\t\t\tp3c_in, p3d_in, p_three);\n"
|
"\tend else begin\n"
|
"\tend else begin\n"
|
"\t\twire\t[(CWIDTH):0]\tp3c_in;\n"
|
"\t\twire\t[(CWIDTH):0]\tp3c_in;\n"
|
"\t\twire\t[(IWIDTH+1):0]\tp3d_in;\n"
|
"\t\twire\t[(IWIDTH+1):0]\tp3d_in;\n"
|
"\t\tassign\tp3c_in = ir_coef_i + ir_coef_r;\n"
|
"\t\tassign\tp3c_in = ir_coef_i + ir_coef_r;\n"
|
"\t\tassign\tp3d_in = r_dif_r + r_dif_i;\n"
|
"\t\tassign\tp3d_in = r_dif_r + r_dif_i;\n"
|
"\n"
|
"\n"
|
"\t\tshiftaddmpy #(IWIDTH+2,CWIDTH+1) p1a(i_clk, i_ce,\n"
|
"\t\tshiftaddmpy #(IWIDTH+2,CWIDTH+1) p1a(i_clk, i_ce,\n"
|
"\t\t\t\t{r_dif_r[IWIDTH],r_dif_r},\n"
|
"\t\t\t\t{r_dif_r[IWIDTH],r_dif_r},\n"
|
"\t\t\t\t{ir_coef_r[CWIDTH-1],ir_coef_r}, p_one);\n"
|
"\t\t\t\t{ir_coef_r[CWIDTH-1],ir_coef_r}, p_one);\n"
|
"\t\tshiftaddmpy #(IWIDTH+2,CWIDTH+1) p2a(i_clk, i_ce,\n"
|
"\t\tshiftaddmpy #(IWIDTH+2,CWIDTH+1) p2a(i_clk, i_ce,\n"
|
"\t\t\t\t{r_dif_i[IWIDTH], r_dif_i},\n"
|
"\t\t\t\t{r_dif_i[IWIDTH], r_dif_i},\n"
|
"\t\t\t\t{ir_coef_i[CWIDTH-1],ir_coef_i}, p_two);\n"
|
"\t\t\t\t{ir_coef_i[CWIDTH-1],ir_coef_i}, p_two);\n"
|
"\t\tshiftaddmpy #(IWIDTH+2,CWIDTH+1) p3a(i_clk, i_ce,\n"
|
"\t\tshiftaddmpy #(IWIDTH+2,CWIDTH+1) p3a(i_clk, i_ce,\n"
|
"\t\t\t\tp3d_in, p3c_in, p_three);\n"
|
"\t\t\t\tp3d_in, p3c_in, p_three);\n"
|
"\tend\n"
|
"\tend\n"
|
"\tendgenerate\n"
|
"\tendgenerate\n"
|
"\n");
|
"\n");
|
fprintf(fp,
|
fprintf(fp,
|
"\t// These values are held in memory and delayed during the\n"
|
"\t// These values are held in memory and delayed during the\n"
|
"\t// multiply. Here, we recover them. During the multiply,\n"
|
"\t// multiply. Here, we recover them. During the multiply,\n"
|
"\t// values were multiplied by 2^(CWIDTH-2)*exp{-j*2*pi*...},\n"
|
"\t// values were multiplied by 2^(CWIDTH-2)*exp{-j*2*pi*...},\n"
|
"\t// therefore, the left_x values need to be right shifted by\n"
|
"\t// therefore, the left_x values need to be right shifted by\n"
|
"\t// CWIDTH-2 as well. The additional bits come from a sign\n"
|
"\t// CWIDTH-2 as well. The additional bits come from a sign\n"
|
"\t// extension.\n"
|
"\t// extension.\n"
|
"\twire aux;\n"
|
"\twire aux;\n"
|
"\twire\tsigned\t[(IWIDTH+CWIDTH):0] fifo_i, fifo_r;\n"
|
"\twire\tsigned\t[(IWIDTH+CWIDTH):0] fifo_i, fifo_r;\n"
|
"\treg\t\t[(2*IWIDTH+2):0] fifo_read;\n"
|
"\treg\t\t[(2*IWIDTH+2):0] fifo_read;\n"
|
"\tassign\tfifo_r = { {2{fifo_read[2*(IWIDTH+1)-1]}}, fifo_read[(2*(IWIDTH+1)-1):(IWIDTH+1)], {(CWIDTH-2){1'b0}} };\n"
|
"\tassign\tfifo_r = { {2{fifo_read[2*(IWIDTH+1)-1]}}, fifo_read[(2*(IWIDTH+1)-1):(IWIDTH+1)], {(CWIDTH-2){1'b0}} };\n"
|
"\tassign\tfifo_i = { {2{fifo_read[(IWIDTH+1)-1]}}, fifo_read[((IWIDTH+1)-1):0], {(CWIDTH-2){1'b0}} };\n"
|
"\tassign\tfifo_i = { {2{fifo_read[(IWIDTH+1)-1]}}, fifo_read[((IWIDTH+1)-1):0], {(CWIDTH-2){1'b0}} };\n"
|
"\tassign\taux = fifo_read[2*IWIDTH+2];\n"
|
"\tassign\taux = fifo_read[2*IWIDTH+2];\n"
|
"\n"
|
"\n"
|
"\n"
|
"\n"
|
"\treg\tsigned\t[(OWIDTH-1):0] b_left_r, b_left_i,\n"
|
"\treg\tsigned\t[(OWIDTH-1):0] b_left_r, b_left_i,\n"
|
"\t\t\t\t\t\tb_right_r, b_right_i;\n"
|
"\t\t\t\t\t\tb_right_r, b_right_i;\n"
|
"\treg\tsigned\t[(CWIDTH+IWIDTH+3-1):0] mpy_r, mpy_i;\n"
|
"\treg\tsigned\t[(CWIDTH+IWIDTH+3-1):0] mpy_r, mpy_i;\n"
|
"\n");
|
"\n");
|
fprintf(fp,
|
fprintf(fp,
|
"\t// Let's do some rounding and remove unnecessary bits.\n"
|
"\t// Let's do some rounding and remove unnecessary bits.\n"
|
"\t// We have (IWIDTH+CWIDTH+3) bits here, we need to drop down to\n"
|
"\t// We have (IWIDTH+CWIDTH+3) bits here, we need to drop down to\n"
|
"\t// OWIDTH, and SHIFT by SHIFT bits in the process. The trick is\n"
|
"\t// OWIDTH, and SHIFT by SHIFT bits in the process. The trick is\n"
|
"\t// that we don\'t need (IWIDTH+CWIDTH+3) bits. We\'ve accumulated\n"
|
"\t// that we don\'t need (IWIDTH+CWIDTH+3) bits. We\'ve accumulated\n"
|
"\t// them, but the actual values will never fill all these bits.\n"
|
"\t// them, but the actual values will never fill all these bits.\n"
|
"\t// In particular, we only need:\n"
|
"\t// In particular, we only need:\n"
|
"\t//\t IWIDTH bits for the input\n"
|
"\t//\t IWIDTH bits for the input\n"
|
"\t//\t +1 bit for the add/subtract\n"
|
"\t//\t +1 bit for the add/subtract\n"
|
"\t//\t+CWIDTH bits for the coefficient multiply\n"
|
"\t//\t+CWIDTH bits for the coefficient multiply\n"
|
"\t//\t +1 bit for the add/subtract in the complex multiply\n"
|
"\t//\t +1 bit for the add/subtract in the complex multiply\n"
|
"\t//\t ------\n"
|
"\t//\t ------\n"
|
"\t//\t (IWIDTH+CWIDTH+2) bits at full precision.\n"
|
"\t//\t (IWIDTH+CWIDTH+2) bits at full precision.\n"
|
"\t//\n"
|
"\t//\n"
|
"\t// However, the coefficient multiply multiplied by a maximum value\n"
|
"\t// However, the coefficient multiply multiplied by a maximum value\n"
|
"\t// of 2^(CWIDTH-2). Thus, we only have\n"
|
"\t// of 2^(CWIDTH-2). Thus, we only have\n"
|
"\t//\t IWIDTH bits for the input\n"
|
"\t//\t IWIDTH bits for the input\n"
|
"\t//\t +1 bit for the add/subtract\n"
|
"\t//\t +1 bit for the add/subtract\n"
|
"\t//\t+CWIDTH-2 bits for the coefficient multiply\n"
|
"\t//\t+CWIDTH-2 bits for the coefficient multiply\n"
|
"\t//\t +1 (optional) bit for the add/subtract in the cpx mpy.\n"
|
"\t//\t +1 (optional) bit for the add/subtract in the cpx mpy.\n"
|
"\t//\t -------- ... multiply. (This last bit may be shifted out.)\n"
|
"\t//\t -------- ... multiply. (This last bit may be shifted out.)\n"
|
"\t//\t (IWIDTH+CWIDTH) valid output bits. \n"
|
"\t//\t (IWIDTH+CWIDTH) valid output bits. \n"
|
"\t// Now, if the user wants to keep any extras of these (via OWIDTH),\n"
|
"\t// Now, if the user wants to keep any extras of these (via OWIDTH),\n"
|
"\t// or if he wishes to arbitrarily shift some of these off (via\n"
|
"\t// or if he wishes to arbitrarily shift some of these off (via\n"
|
"\t// SHIFT) we accomplish that here.\n"
|
"\t// SHIFT) we accomplish that here.\n"
|
"\n");
|
"\n");
|
fprintf(fp,
|
fprintf(fp,
|
"\twire\tsigned\t[(OWIDTH-1):0]\trnd_left_r, rnd_left_i, rnd_right_r, rnd_right_i;\n\n");
|
"\twire\tsigned\t[(OWIDTH-1):0]\trnd_left_r, rnd_left_i, rnd_right_r, rnd_right_i;\n\n");
|
|
|
fprintf(fp,
|
fprintf(fp,
|
"\t%s\t#(CWIDTH+IWIDTH+3,OWIDTH,SHIFT+4)\tdo_rnd_left_r(i_clk, i_ce,\n"
|
"\t%s\t#(CWIDTH+IWIDTH+3,OWIDTH,SHIFT+4)\tdo_rnd_left_r(i_clk, i_ce,\n"
|
"\t\t\t\t{ {2{fifo_r[(IWIDTH+CWIDTH)]}}, fifo_r }, rnd_left_r);\n\n",
|
"\t\t\t\t{ {2{fifo_r[(IWIDTH+CWIDTH)]}}, fifo_r }, rnd_left_r);\n\n",
|
rnd_string);
|
rnd_string);
|
fprintf(fp,
|
fprintf(fp,
|
"\t%s\t#(CWIDTH+IWIDTH+3,OWIDTH,SHIFT+4)\tdo_rnd_left_i(i_clk, i_ce,\n"
|
"\t%s\t#(CWIDTH+IWIDTH+3,OWIDTH,SHIFT+4)\tdo_rnd_left_i(i_clk, i_ce,\n"
|
"\t\t\t\t{ {2{fifo_i[(IWIDTH+CWIDTH)]}}, fifo_i }, rnd_left_i);\n\n",
|
"\t\t\t\t{ {2{fifo_i[(IWIDTH+CWIDTH)]}}, fifo_i }, rnd_left_i);\n\n",
|
rnd_string);
|
rnd_string);
|
fprintf(fp,
|
fprintf(fp,
|
"\t%s\t#(CWIDTH+IWIDTH+3,OWIDTH,SHIFT+4)\tdo_rnd_right_r(i_clk, i_ce,\n"
|
"\t%s\t#(CWIDTH+IWIDTH+3,OWIDTH,SHIFT+4)\tdo_rnd_right_r(i_clk, i_ce,\n"
|
"\t\t\t\tmpy_r, rnd_right_r);\n\n", rnd_string);
|
"\t\t\t\tmpy_r, rnd_right_r);\n\n", rnd_string);
|
fprintf(fp,
|
fprintf(fp,
|
"\t%s\t#(CWIDTH+IWIDTH+3,OWIDTH,SHIFT+4)\tdo_rnd_right_i(i_clk, i_ce,\n"
|
"\t%s\t#(CWIDTH+IWIDTH+3,OWIDTH,SHIFT+4)\tdo_rnd_right_i(i_clk, i_ce,\n"
|
"\t\t\t\tmpy_i, rnd_right_i);\n\n", rnd_string);
|
"\t\t\t\tmpy_i, rnd_right_i);\n\n", rnd_string);
|
fprintf(fp,
|
fprintf(fp,
|
"\talways @(posedge i_clk)\n"
|
"\talways @(posedge i_clk)\n"
|
"\t\tif (i_ce)\n"
|
"\t\tif (i_ce)\n"
|
"\t\tbegin\n"
|
"\t\tbegin\n"
|
"\t\t\t// First clock, recover all values\n"
|
"\t\t\t// First clock, recover all values\n"
|
"\t\t\tfifo_read <= fifo_left[fifo_read_addr];\n"
|
"\t\t\tfifo_read <= fifo_left[fifo_read_addr];\n"
|
"\t\t\t// These values are IWIDTH+CWIDTH+3 bits wide\n"
|
"\t\t\t// These values are IWIDTH+CWIDTH+3 bits wide\n"
|
"\t\t\t// although they only need to be (IWIDTH+1)\n"
|
"\t\t\t// although they only need to be (IWIDTH+1)\n"
|
"\t\t\t// + (CWIDTH) bits wide. (We\'ve got two\n"
|
"\t\t\t// + (CWIDTH) bits wide. (We\'ve got two\n"
|
"\t\t\t// extra bits we need to get rid of.)\n"
|
"\t\t\t// extra bits we need to get rid of.)\n"
|
"\t\t\tmpy_r <= p_one - p_two;\n"
|
"\t\t\tmpy_r <= p_one - p_two;\n"
|
"\t\t\tmpy_i <= p_three - p_one - p_two;\n"
|
"\t\t\tmpy_i <= p_three - p_one - p_two;\n"
|
"\n"
|
"\n"
|
"\t\t\t// Second clock, round and latch for final clock\n"
|
"\t\t\t// Second clock, round and latch for final clock\n"
|
"\t\t\tb_right_r <= rnd_right_r;\n"
|
"\t\t\tb_right_r <= rnd_right_r;\n"
|
"\t\t\tb_right_i <= rnd_right_i;\n"
|
"\t\t\tb_right_i <= rnd_right_i;\n"
|
"\t\t\tb_left_r <= rnd_left_r;\n"
|
"\t\t\tb_left_r <= rnd_left_r;\n"
|
"\t\t\tb_left_i <= rnd_left_i;\n"
|
"\t\t\tb_left_i <= rnd_left_i;\n"
|
|
"\t\tend\n"
|
|
"\n");
|
|
fprintf(fp,
|
|
"\talways @(posedge i_clk)\n"
|
|
"\t\tif (i_rst)\n"
|
|
"\t\t\to_aux <= 1\'b0;\n"
|
|
"\t\telse if (i_ce)\n"
|
|
"\t\tbegin\n"
|
|
"\t\t\t// Second clock, latch for final clock\n"
|
"\t\t\to_aux <= aux & ovalid;\n"
|
"\t\t\to_aux <= aux & ovalid;\n"
|
"\t\tend\n"
|
"\t\tend\n"
|
"\n");
|
"\n");
|
|
|
fprintf(fp,
|
fprintf(fp,
|
"\t// As a final step, we pack our outputs into two packed two\'s\n"
|
"\t// As a final step, we pack our outputs into two packed two\'s\n"
|
"\t// complement numbers per output word, so that each output word\n"
|
"\t// complement numbers per output word, so that each output word\n"
|
"\t// has (2*OWIDTH) bits in it, with the top half being the real\n"
|
"\t// has (2*OWIDTH) bits in it, with the top half being the real\n"
|
"\t// portion and the bottom half being the imaginary portion.\n"
|
"\t// portion and the bottom half being the imaginary portion.\n"
|
"\tassign o_left = { rnd_left_r, rnd_left_i };\n"
|
"\tassign o_left = { rnd_left_r, rnd_left_i };\n"
|
"\tassign o_right= { rnd_right_r,rnd_right_i};\n"
|
"\tassign o_right= { rnd_right_r,rnd_right_i};\n"
|
"\n"
|
"\n"
|
"endmodule\n");
|
"endmodule\n");
|
fclose(fp);
|
fclose(fp);
|
}
|
}
|
|
|
void build_hwbfly(const char *fname, int xtracbits, ROUND_T rounding) {
|
void build_hwbfly(const char *fname, int xtracbits, ROUND_T rounding) {
|
FILE *fp = fopen(fname, "w");
|
FILE *fp = fopen(fname, "w");
|
if (NULL == fp) {
|
if (NULL == fp) {
|
fprintf(stderr, "Could not open \'%s\' for writing\n", fname);
|
fprintf(stderr, "Could not open \'%s\' for writing\n", fname);
|
perror("O/S Err was:");
|
perror("O/S Err was:");
|
return;
|
return;
|
}
|
}
|
|
|
const char *rnd_string;
|
const char *rnd_string;
|
if (rounding == RND_TRUNCATE)
|
if (rounding == RND_TRUNCATE)
|
rnd_string = "truncate";
|
rnd_string = "truncate";
|
else if (rounding == RND_FROMZERO)
|
else if (rounding == RND_FROMZERO)
|
rnd_string = "roundfromzero";
|
rnd_string = "roundfromzero";
|
else if (rounding == RND_HALFUP)
|
else if (rounding == RND_HALFUP)
|
rnd_string = "roundhalfup";
|
rnd_string = "roundhalfup";
|
else
|
else
|
rnd_string = "convround";
|
rnd_string = "convround";
|
|
|
|
|
fprintf(fp,
|
fprintf(fp,
|
"///////////////////////////////////////////////////////////////////////////\n"
|
"///////////////////////////////////////////////////////////////////////////\n"
|
"//\n"
|
"//\n"
|
"// Filename: hwbfly.v\n"
|
"// Filename: hwbfly.v\n"
|
"//\n"
|
"//\n"
|
"// Project: %s\n"
|
"// Project: %s\n"
|
"//\n"
|
"//\n"
|
"// Purpose: This routine is identical to the butterfly.v routine found\n"
|
"// Purpose: This routine is identical to the butterfly.v routine found\n"
|
"// in 'butterfly.v', save only that it uses the verilog \n"
|
"// in 'butterfly.v', save only that it uses the verilog \n"
|
"// operator '*' in hopes that the synthesizer would be able\n"
|
"// operator '*' in hopes that the synthesizer would be able\n"
|
"// to optimize it with hardware resources.\n"
|
"// to optimize it with hardware resources.\n"
|
"//\n"
|
"//\n"
|
"// It is understood that a hardware multiply can complete its\n"
|
"// It is understood that a hardware multiply can complete its\n"
|
"// operation in a single clock.\n"
|
"// operation in a single clock.\n"
|
"//\n"
|
"//\n"
|
"//\n%s"
|
"//\n%s"
|
"//\n", prjname, creator);
|
"//\n", prjname, creator);
|
fprintf(fp, "%s", cpyleft);
|
fprintf(fp, "%s", cpyleft);
|
fprintf(fp,
|
fprintf(fp,
|
"module hwbfly(i_clk, i_rst, i_ce, i_coef, i_left, i_right, i_aux,\n"
|
"module hwbfly(i_clk, i_rst, i_ce, i_coef, i_left, i_right, i_aux,\n"
|
"\t\to_left, o_right, o_aux);\n"
|
"\t\to_left, o_right, o_aux);\n"
|
"\t// Public changeable parameters ...\n"
|
"\t// Public changeable parameters ...\n"
|
"\tparameter IWIDTH=16,CWIDTH=IWIDTH+%d,OWIDTH=IWIDTH+1;\n"
|
"\tparameter IWIDTH=16,CWIDTH=IWIDTH+%d,OWIDTH=IWIDTH+1;\n"
|
"\t// Parameters specific to the core that should not be changed.\n"
|
"\t// Parameters specific to the core that should not be changed.\n"
|
"\tparameter\tSHIFT=0;\n"
|
"\tparameter\tSHIFT=0;\n"
|
"\tinput\t\ti_clk, i_rst, i_ce;\n"
|
"\tinput\t\ti_clk, i_rst, i_ce;\n"
|
"\tinput\t\t[(2*CWIDTH-1):0]\ti_coef;\n"
|
"\tinput\t\t[(2*CWIDTH-1):0]\ti_coef;\n"
|
"\tinput\t\t[(2*IWIDTH-1):0]\ti_left, i_right;\n"
|
"\tinput\t\t[(2*IWIDTH-1):0]\ti_left, i_right;\n"
|
"\tinput\t\ti_aux;\n"
|
"\tinput\t\ti_aux;\n"
|
"\toutput\twire\t[(2*OWIDTH-1):0]\to_left, o_right;\n"
|
"\toutput\twire\t[(2*OWIDTH-1):0]\to_left, o_right;\n"
|
"\toutput\treg\to_aux;\n"
|
"\toutput\treg\to_aux;\n"
|
"\n", xtracbits);
|
"\n", xtracbits);
|
fprintf(fp,
|
fprintf(fp,
|
"\twire\t[(OWIDTH-1):0] o_left_r, o_left_i, o_right_r, o_right_i;\n"
|
"\twire\t[(OWIDTH-1):0] o_left_r, o_left_i, o_right_r, o_right_i;\n"
|
"\n"
|
"\n"
|
"\treg\t[(2*IWIDTH-1):0] r_left, r_right;\n"
|
"\treg\t[(2*IWIDTH-1):0] r_left, r_right;\n"
|
"\treg\t r_aux, r_aux_2;\n"
|
"\treg\t r_aux, r_aux_2;\n"
|
"\treg\t[(2*CWIDTH-1):0] r_coef, r_coef_2;\n"
|
"\treg\t[(2*CWIDTH-1):0] r_coef, r_coef_2;\n"
|
"\twire\tsigned [(CWIDTH-1):0] r_coef_r, r_coef_i;\n"
|
"\twire\tsigned [(CWIDTH-1):0] r_coef_r, r_coef_i;\n"
|
"\tassign\tr_coef_r = r_coef_2[ (2*CWIDTH-1):(CWIDTH)];\n"
|
"\tassign\tr_coef_r = r_coef_2[ (2*CWIDTH-1):(CWIDTH)];\n"
|
"\tassign\tr_coef_i = r_coef_2[ ( CWIDTH-1):0];\n"
|
"\tassign\tr_coef_i = r_coef_2[ ( CWIDTH-1):0];\n"
|
"\twire signed [(IWIDTH-1):0] r_left_r, r_left_i, r_right_r, r_right_i;\n"
|
"\twire signed [(IWIDTH-1):0] r_left_r, r_left_i, r_right_r, r_right_i;\n"
|
"\tassign\tr_left_r = r_left[ (2*IWIDTH-1):(IWIDTH)];\n"
|
"\tassign\tr_left_r = r_left[ (2*IWIDTH-1):(IWIDTH)];\n"
|
"\tassign\tr_left_i = r_left[ (IWIDTH-1):0];\n"
|
"\tassign\tr_left_i = r_left[ (IWIDTH-1):0];\n"
|
"\tassign\tr_right_r = r_right[(2*IWIDTH-1):(IWIDTH)];\n"
|
"\tassign\tr_right_r = r_right[(2*IWIDTH-1):(IWIDTH)];\n"
|
"\tassign\tr_right_i = r_right[(IWIDTH-1):0];\n"
|
"\tassign\tr_right_i = r_right[(IWIDTH-1):0];\n"
|
"\n"
|
"\n"
|
"\treg signed [(IWIDTH):0] r_sum_r, r_sum_i, r_dif_r, r_dif_i;\n"
|
"\treg signed [(IWIDTH):0] r_sum_r, r_sum_i, r_dif_r, r_dif_i;\n"
|
"\n"
|
"\n"
|
"\treg [(2*IWIDTH+2):0] leftv, leftvv;\n"
|
"\treg [(2*IWIDTH+2):0] leftv, leftvv;\n"
|
"\n"
|
"\n"
|
"\t// Set up the input to the multiply\n"
|
"\t// Set up the input to the multiply\n"
|
"\talways @(posedge i_clk)\n"
|
"\talways @(posedge i_clk)\n"
|
"\t\tif (i_rst)\n"
|
"\t\tif (i_rst)\n"
|
"\t\tbegin\n"
|
"\t\tbegin\n"
|
"\t\t\tr_aux <= 1'b0;\n"
|
"\t\t\tr_aux <= 1'b0;\n"
|
"\t\t\tr_aux_2 <= 1'b0;\n"
|
"\t\t\tr_aux_2 <= 1'b0;\n"
|
"\t\tend else if (i_ce)\n"
|
"\t\tend else if (i_ce)\n"
|
"\t\tbegin\n"
|
"\t\tbegin\n"
|
"\t\t\t// One clock just latches the inputs\n"
|
"\t\t\t// One clock just latches the inputs\n"
|
"\t\t\tr_left <= i_left; // No change in # of bits\n"
|
"\t\t\tr_left <= i_left; // No change in # of bits\n"
|
"\t\t\tr_right <= i_right;\n"
|
"\t\t\tr_right <= i_right;\n"
|
"\t\t\tr_aux <= i_aux;\n"
|
"\t\t\tr_aux <= i_aux;\n"
|
"\t\t\tr_coef <= i_coef;\n"
|
"\t\t\tr_coef <= i_coef;\n"
|
"\t\t\t// Next clock adds/subtracts\n"
|
"\t\t\t// Next clock adds/subtracts\n"
|
"\t\t\tr_sum_r <= r_left_r + r_right_r; // Now IWIDTH+1 bits\n"
|
"\t\t\tr_sum_r <= r_left_r + r_right_r; // Now IWIDTH+1 bits\n"
|
"\t\t\tr_sum_i <= r_left_i + r_right_i;\n"
|
"\t\t\tr_sum_i <= r_left_i + r_right_i;\n"
|
"\t\t\tr_dif_r <= r_left_r - r_right_r;\n"
|
"\t\t\tr_dif_r <= r_left_r - r_right_r;\n"
|
"\t\t\tr_dif_i <= r_left_i - r_right_i;\n"
|
"\t\t\tr_dif_i <= r_left_i - r_right_i;\n"
|
"\t\t\t// Other inputs are simply delayed on second clock\n"
|
"\t\t\t// Other inputs are simply delayed on second clock\n"
|
"\t\t\tr_aux_2 <= r_aux;\n"
|
"\t\t\tr_aux_2 <= r_aux;\n"
|
"\t\t\tr_coef_2<= r_coef;\n"
|
"\t\t\tr_coef_2<= r_coef;\n"
|
"\t\tend\n"
|
"\t\tend\n"
|
"\n\n");
|
"\n\n");
|
fprintf(fp,
|
fprintf(fp,
|
"\t// See comments in the butterfly.v source file for a discussion of\n"
|
"\t// See comments in the butterfly.v source file for a discussion of\n"
|
"\t// these operations and the appropriate bit widths.\n\n");
|
"\t// these operations and the appropriate bit widths.\n\n");
|
fprintf(fp,
|
fprintf(fp,
|
"\twire signed [(CWIDTH-1):0] ir_coef_r, ir_coef_i;\n"
|
"\twire signed [(CWIDTH-1):0] ir_coef_r, ir_coef_i;\n"
|
"\tassign ir_coef_r = r_coef_2[(2*CWIDTH-1):CWIDTH];\n"
|
"\tassign ir_coef_r = r_coef_2[(2*CWIDTH-1):CWIDTH];\n"
|
"\tassign ir_coef_i = r_coef_2[(CWIDTH-1):0];\n"
|
"\tassign ir_coef_i = r_coef_2[(CWIDTH-1):0];\n"
|
"\treg\tsigned [((IWIDTH+2)+(CWIDTH+1)-1):0] p_one, p_two, p_three;\n"
|
"\treg\tsigned [((IWIDTH+2)+(CWIDTH+1)-1):0] p_one, p_two, p_three;\n"
|
"\n"
|
"\n"
|
"\treg\tsigned [(CWIDTH):0] p3c_in, p1c_in, p2c_in;\n"
|
"\treg\tsigned [(CWIDTH):0] p3c_in, p1c_in, p2c_in;\n"
|
"\treg\tsigned [(IWIDTH+1):0] p3d_in, p1d_in, p2d_in;\n"
|
"\treg\tsigned [(IWIDTH+1):0] p3d_in, p1d_in, p2d_in;\n"
|
"\treg\t[3:0] pipeline;\n"
|
"\treg\t[3:0] pipeline;\n"
|
"\n"
|
"\n"
|
"\talways @(posedge i_clk)\n"
|
"\talways @(posedge i_clk)\n"
|
"\tbegin\n"
|
"\tbegin\n"
|
"\t\tif (i_rst)\n"
|
"\t\tif (i_rst)\n"
|
"\t\tbegin\n"
|
"\t\tbegin\n"
|
"\t\t\tpipeline <= 4'h0;\n"
|
"\t\t\tpipeline <= 4'h0;\n"
|
"\t\t\tleftv <= 0;\n"
|
"\t\t\tleftv <= 0;\n"
|
"\t\t\tleftvv <= 0;\n"
|
"\t\t\tleftvv <= 0;\n"
|
"\t\tend else if (i_clk)\n"
|
"\t\tend else if (i_clk)\n"
|
"\t\tbegin\n"
|
"\t\tbegin\n"
|
"\t\t\t// Second clock, pipeline = 1\n"
|
"\t\t\t// Second clock, pipeline = 1\n"
|
"\t\t\tp1c_in <= { ir_coef_r[(CWIDTH-1)], ir_coef_r };\n"
|
"\t\t\tp1c_in <= { ir_coef_r[(CWIDTH-1)], ir_coef_r };\n"
|
"\t\t\tp2c_in <= { ir_coef_i[(CWIDTH-1)], ir_coef_i };\n"
|
"\t\t\tp2c_in <= { ir_coef_i[(CWIDTH-1)], ir_coef_i };\n"
|
"\t\t\tp1d_in <= { r_dif_r[(IWIDTH)], r_dif_r };\n"
|
"\t\t\tp1d_in <= { r_dif_r[(IWIDTH)], r_dif_r };\n"
|
"\t\t\tp2d_in <= { r_dif_i[(IWIDTH)], r_dif_i };\n"
|
"\t\t\tp2d_in <= { r_dif_i[(IWIDTH)], r_dif_i };\n"
|
"\t\t\tp3c_in <= ir_coef_i + ir_coef_r;\n"
|
"\t\t\tp3c_in <= ir_coef_i + ir_coef_r;\n"
|
"\t\t\tp3d_in <= r_dif_r + r_dif_i;\n"
|
"\t\t\tp3d_in <= r_dif_r + r_dif_i;\n"
|
"\n"
|
"\n"
|
"\t\t\tleftv <= { r_aux_2, r_sum_r, r_sum_i };\n"
|
"\t\t\tleftv <= { r_aux_2, r_sum_r, r_sum_i };\n"
|
"\n"
|
"\n"
|
"\t\t\t// Third clock, pipeline = 3\n"
|
"\t\t\t// Third clock, pipeline = 3\n"
|
"\t\t\tp_one <= p1c_in * p1d_in;\n"
|
"\t\t\tp_one <= p1c_in * p1d_in;\n"
|
"\t\t\tp_two <= p2c_in * p2d_in;\n"
|
"\t\t\tp_two <= p2c_in * p2d_in;\n"
|
"\t\t\tp_three <= p3c_in * p3d_in;\n"
|
"\t\t\tp_three <= p3c_in * p3d_in;\n"
|
"\t\t\tleftvv <= leftv;\n"
|
"\t\t\tleftvv <= leftv;\n"
|
"\n"
|
"\n"
|
"\t\t\tpipeline <= { pipeline[2:0], 1'b1 };\n"
|
"\t\t\tpipeline <= { pipeline[2:0], 1'b1 };\n"
|
"\t\tend\n"
|
"\t\tend\n"
|
"\tend\n"
|
"\tend\n"
|
"\n");
|
"\n");
|
|
|
fprintf(fp,
|
fprintf(fp,
|
"\t// These values are held in memory and delayed during the\n"
|
"\t// These values are held in memory and delayed during the\n"
|
"\t// multiply. Here, we recover them. During the multiply,\n"
|
"\t// multiply. Here, we recover them. During the multiply,\n"
|
"\t// values were multiplied by 2^(CWIDTH-2)*exp{-j*2*pi*...},\n"
|
"\t// values were multiplied by 2^(CWIDTH-2)*exp{-j*2*pi*...},\n"
|
"\t// therefore, the left_x values need to be right shifted by\n"
|
"\t// therefore, the left_x values need to be right shifted by\n"
|
"\t// CWIDTH-2 as well. The additional bits come from a sign\n"
|
"\t// CWIDTH-2 as well. The additional bits come from a sign\n"
|
"\t// extension.\n"
|
"\t// extension.\n"
|
"\twire\taux_s, aux_ss;\n"
|
"\twire\taux_s;\n"
|
"\twire\tsigned\t[(IWIDTH+CWIDTH):0] left_si, left_sr;\n"
|
"\twire\tsigned\t[(IWIDTH+CWIDTH):0] left_si, left_sr;\n"
|
"\treg\t\t[(2*IWIDTH+2):0] left_saved;\n"
|
"\treg\t\t[(2*IWIDTH+2):0] left_saved;\n"
|
"\tassign\tleft_sr = { {2{left_saved[2*(IWIDTH+1)-1]}}, left_saved[(2*(IWIDTH+1)-1):(IWIDTH+1)], {(CWIDTH-2){1'b0}} };\n"
|
"\tassign\tleft_sr = { {2{left_saved[2*(IWIDTH+1)-1]}}, left_saved[(2*(IWIDTH+1)-1):(IWIDTH+1)], {(CWIDTH-2){1'b0}} };\n"
|
"\tassign\tleft_si = { {2{left_saved[(IWIDTH+1)-1]}}, left_saved[((IWIDTH+1)-1):0], {(CWIDTH-2){1'b0}} };\n"
|
"\tassign\tleft_si = { {2{left_saved[(IWIDTH+1)-1]}}, left_saved[((IWIDTH+1)-1):0], {(CWIDTH-2){1'b0}} };\n"
|
"\tassign\taux_s = left_saved[2*IWIDTH+2];\n"
|
"\tassign\taux_s = left_saved[2*IWIDTH+2];\n"
|
"\n"
|
"\n"
|
"\n"
|
"\n"
|
"\treg signed [(CWIDTH+IWIDTH+3-1):0] mpy_r, mpy_i;\n");
|
"\treg signed [(CWIDTH+IWIDTH+3-1):0] mpy_r, mpy_i;\n");
|
fprintf(fp,
|
fprintf(fp,
|
"\twire\tsigned\t[(OWIDTH-1):0]\trnd_left_r, rnd_left_i, rnd_right_r, rnd_right_i;\n\n");
|
"\twire\tsigned\t[(OWIDTH-1):0]\trnd_left_r, rnd_left_i, rnd_right_r, rnd_right_i;\n\n");
|
|
|
fprintf(fp,
|
fprintf(fp,
|
"\t%s\t#(CWIDTH+IWIDTH+3,OWIDTH,SHIFT+4)\tdo_rnd_left_r(i_clk, i_ce,\n"
|
"\t%s\t#(CWIDTH+IWIDTH+3,OWIDTH,SHIFT+4)\tdo_rnd_left_r(i_clk, i_ce,\n"
|
"\t\t\t\t{ {2{left_sr[(IWIDTH+CWIDTH)]}}, left_sr }, rnd_left_r);\n\n",
|
"\t\t\t\t{ {2{left_sr[(IWIDTH+CWIDTH)]}}, left_sr }, rnd_left_r);\n\n",
|
rnd_string);
|
rnd_string);
|
fprintf(fp,
|
fprintf(fp,
|
"\t%s\t#(CWIDTH+IWIDTH+3,OWIDTH,SHIFT+4)\tdo_rnd_left_i(i_clk, i_ce,\n"
|
"\t%s\t#(CWIDTH+IWIDTH+3,OWIDTH,SHIFT+4)\tdo_rnd_left_i(i_clk, i_ce,\n"
|
"\t\t\t\t{ {2{left_si[(IWIDTH+CWIDTH)]}}, left_si }, rnd_left_i);\n\n",
|
"\t\t\t\t{ {2{left_si[(IWIDTH+CWIDTH)]}}, left_si }, rnd_left_i);\n\n",
|
rnd_string);
|
rnd_string);
|
fprintf(fp,
|
fprintf(fp,
|
"\t%s\t#(CWIDTH+IWIDTH+3,OWIDTH,SHIFT+4)\tdo_rnd_right_r(i_clk, i_ce,\n"
|
"\t%s\t#(CWIDTH+IWIDTH+3,OWIDTH,SHIFT+4)\tdo_rnd_right_r(i_clk, i_ce,\n"
|
"\t\t\t\tmpy_r, rnd_right_r);\n\n", rnd_string);
|
"\t\t\t\tmpy_r, rnd_right_r);\n\n", rnd_string);
|
fprintf(fp,
|
fprintf(fp,
|
"\t%s\t#(CWIDTH+IWIDTH+3,OWIDTH,SHIFT+4)\tdo_rnd_right_i(i_clk, i_ce,\n"
|
"\t%s\t#(CWIDTH+IWIDTH+3,OWIDTH,SHIFT+4)\tdo_rnd_right_i(i_clk, i_ce,\n"
|
"\t\t\t\tmpy_i, rnd_right_i);\n\n", rnd_string);
|
"\t\t\t\tmpy_i, rnd_right_i);\n\n", rnd_string);
|
|
|
fprintf(fp,
|
fprintf(fp,
|
"\talways @(posedge i_clk)\n"
|
"\talways @(posedge i_clk)\n"
|
"\t\tif (i_rst)\n"
|
"\t\tif (i_rst)\n"
|
"\t\tbegin\n"
|
"\t\tbegin\n"
|
"\t\t\tleft_saved <= 0;\n"
|
"\t\t\tleft_saved <= 0;\n"
|
"\t\t\to_aux <= 1'b0;\n"
|
"\t\t\to_aux <= 1'b0;\n"
|
"\t\tend else if (i_ce)\n"
|
"\t\tend else if (i_ce)\n"
|
"\t\tbegin\n"
|
"\t\tbegin\n"
|
"\t\t\t// First clock, recover all values\n"
|
"\t\t\t// First clock, recover all values\n"
|
"\t\t\tleft_saved <= leftvv;\n"
|
"\t\t\tleft_saved <= leftvv;\n"
|
"\t\t\t// These values are IWIDTH+CWIDTH+3 bits wide\n"
|
"\t\t\t// These values are IWIDTH+CWIDTH+3 bits wide\n"
|
"\t\t\t// although they only need to be (IWIDTH+1)\n"
|
"\t\t\t// although they only need to be (IWIDTH+1)\n"
|
"\t\t\t// + (CWIDTH) bits wide. (We've got two\n"
|
"\t\t\t// + (CWIDTH) bits wide. (We've got two\n"
|
"\t\t\t// extra bits we need to get rid of.)\n"
|
"\t\t\t// extra bits we need to get rid of.)\n"
|
"\t\t\tmpy_r <= p_one - p_two;\n"
|
"\t\t\tmpy_r <= p_one - p_two;\n"
|
"\t\t\tmpy_i <= p_three - p_one - p_two;\n"
|
"\t\t\tmpy_i <= p_three - p_one - p_two;\n"
|
"\n"
|
"\n"
|
"\t\t\t// Second clock, round and latch for final clock\n"
|
"\t\t\t// Second clock, round and latch for final clock\n"
|
"\n"
|
"\n"
|
"\t\t\to_aux <= aux_s;\n"
|
"\t\t\to_aux <= aux_s;\n"
|
"\t\tend\n"
|
"\t\tend\n"
|
"\n");
|
"\n");
|
|
|
fprintf(fp,
|
fprintf(fp,
|
"\t// As a final step, we pack our outputs into two packed two's\n"
|
"\t// As a final step, we pack our outputs into two packed two's\n"
|
"\t// complement numbers per output word, so that each output word\n"
|
"\t// complement numbers per output word, so that each output word\n"
|
"\t// has (2*OWIDTH) bits in it, with the top half being the real\n"
|
"\t// has (2*OWIDTH) bits in it, with the top half being the real\n"
|
"\t// portion and the bottom half being the imaginary portion.\n"
|
"\t// portion and the bottom half being the imaginary portion.\n"
|
"\tassign\to_left = { rnd_left_r, rnd_left_i };\n"
|
"\tassign\to_left = { rnd_left_r, rnd_left_i };\n"
|
"\tassign\to_right= { rnd_right_r,rnd_right_i};\n"
|
"\tassign\to_right= { rnd_right_r,rnd_right_i};\n"
|
"\n"
|
"\n"
|
"endmodule\n");
|
"endmodule\n");
|
|
|
}
|
}
|
|
|
void build_stage(const char *fname, int stage, bool odd, int nbits, bool inv, int xtra, bool hwmpy=false) {
|
void build_stage(const char *fname, int stage, bool odd, int nbits, bool inv, int xtra, bool hwmpy=false) {
|
FILE *fstage = fopen(fname, "w");
|
FILE *fstage = fopen(fname, "w");
|
int cbits = nbits + xtra;
|
int cbits = nbits + xtra;
|
|
|
if ((cbits * 2) >= sizeof(long long)*8) {
|
if ((cbits * 2) >= sizeof(long long)*8) {
|
fprintf(stderr, "ERROR: CMEM Coefficient precision requested overflows long long data type.\n");
|
fprintf(stderr, "ERROR: CMEM Coefficient precision requested overflows long long data type.\n");
|
exit(-1);
|
exit(-1);
|
}
|
}
|
|
|
if (fstage == NULL) {
|
if (fstage == NULL) {
|
fprintf(stderr, "ERROR: Could not open %s for writing!\n", fname);
|
fprintf(stderr, "ERROR: Could not open %s for writing!\n", fname);
|
perror("O/S Err was:");
|
perror("O/S Err was:");
|
fprintf(stderr, "Attempting to continue, but this file will be missing.\n");
|
fprintf(stderr, "Attempting to continue, but this file will be missing.\n");
|
return;
|
return;
|
}
|
}
|
|
|
fprintf(fstage,
|
fprintf(fstage,
|
"////////////////////////////////////////////////////////////////////////////\n"
|
"////////////////////////////////////////////////////////////////////////////\n"
|
"//\n"
|
"//\n"
|
"// Filename: %sfftstage_%c%d.v\n"
|
"// Filename: %sfftstage_%c%d.v\n"
|
"//\n"
|
"//\n"
|
"// Project: %s\n"
|
"// Project: %s\n"
|
"//\n"
|
"//\n"
|
"// Purpose: This file is (almost) a Verilog source file. It is meant to\n"
|
"// Purpose: This file is (almost) a Verilog source file. It is meant to\n"
|
"// be used by a FFT core compiler to generate FFTs which may be\n"
|
"// be used by a FFT core compiler to generate FFTs which may be\n"
|
"// used as part of an FFT core. Specifically, this file \n"
|
"// used as part of an FFT core. Specifically, this file \n"
|
"// encapsulates the options of an FFT-stage. For any 2^N length\n"
|
"// encapsulates the options of an FFT-stage. For any 2^N length\n"
|
"// FFT, there shall be (N-1) of these stages. \n"
|
"// FFT, there shall be (N-1) of these stages. \n"
|
"//\n%s"
|
"//\n%s"
|
"//\n",
|
"//\n",
|
(inv)?"i":"", (odd)?'o':'e', stage*2, prjname, creator);
|
(inv)?"i":"", (odd)?'o':'e', stage*2, prjname, creator);
|
fprintf(fstage, "%s", cpyleft);
|
fprintf(fstage, "%s", cpyleft);
|
fprintf(fstage, "module\t%sfftstage_%c%d(i_clk, i_rst, i_ce, i_sync, i_data, o_data, o_sync);\n",
|
fprintf(fstage, "module\t%sfftstage_%c%d(i_clk, i_rst, i_ce, i_sync, i_data, o_data, o_sync);\n",
|
(inv)?"i":"", (odd)?'o':'e', stage*2);
|
(inv)?"i":"", (odd)?'o':'e', stage*2);
|
// These parameter values are useless at this point--they are to be
|
// These parameter values are useless at this point--they are to be
|
// replaced by the parameter values in the calling program. Only
|
// replaced by the parameter values in the calling program. Only
|
// problem is, the CWIDTH needs to match exactly!
|
// problem is, the CWIDTH needs to match exactly!
|
fprintf(fstage, "\tparameter\tIWIDTH=%d,CWIDTH=%d,OWIDTH=%d;\n",
|
fprintf(fstage, "\tparameter\tIWIDTH=%d,CWIDTH=%d,OWIDTH=%d;\n",
|
nbits, cbits, nbits+1);
|
nbits, cbits, nbits+1);
|
fprintf(fstage,
|
fprintf(fstage,
|
"\t// Parameters specific to the core that should be changed when this\n"
|
"\t// Parameters specific to the core that should be changed when this\n"
|
"\t// core is built ... Note that the minimum LGSPAN (the base two log\n"
|
"\t// core is built ... Note that the minimum LGSPAN (the base two log\n"
|
"\t// of the span, or the base two log of the current FFT size) is 3.\n"
|
"\t// of the span, or the base two log of the current FFT size) is 3.\n"
|
"\t// Smaller spans (i.e. the span of 2) must use the dblstage module.\n"
|
"\t// Smaller spans (i.e. the span of 2) must use the dblstage module.\n"
|
"\tparameter\tLGWIDTH=11, LGSPAN=9, LGBDLY=5, BFLYSHIFT=0;\n");
|
"\tparameter\tLGWIDTH=11, LGSPAN=9, LGBDLY=5, BFLYSHIFT=0;\n");
|
fprintf(fstage,
|
fprintf(fstage,
|
"\tinput i_clk, i_rst, i_ce, i_sync;\n"
|
"\tinput i_clk, i_rst, i_ce, i_sync;\n"
|
"\tinput [(2*IWIDTH-1):0] i_data;\n"
|
"\tinput [(2*IWIDTH-1):0] i_data;\n"
|
"\toutput reg [(2*OWIDTH-1):0] o_data;\n"
|
"\toutput reg [(2*OWIDTH-1):0] o_data;\n"
|
"\toutput reg o_sync;\n"
|
"\toutput reg o_sync;\n"
|
"\n"
|
"\n"
|
"\treg wait_for_sync;\n"
|
"\treg wait_for_sync;\n"
|
"\treg [(2*IWIDTH-1):0] ib_a, ib_b;\n"
|
"\treg [(2*IWIDTH-1):0] ib_a, ib_b;\n"
|
"\treg [(2*CWIDTH-1):0] ib_c;\n"
|
"\treg [(2*CWIDTH-1):0] ib_c;\n"
|
"\treg ib_sync;\n"
|
"\treg ib_sync;\n"
|
"\n"
|
"\n"
|
"\treg b_started;\n"
|
"\treg b_started;\n"
|
"\twire ob_sync;\n"
|
"\twire ob_sync;\n"
|
"\twire [(2*OWIDTH-1):0]\tob_a, ob_b;\n");
|
"\twire [(2*OWIDTH-1):0]\tob_a, ob_b;\n");
|
fprintf(fstage,
|
fprintf(fstage,
|
"\n"
|
"\n"
|
"\t// %scmem is defined as an array of real and complex values,\n"
|
"\t// %scmem is defined as an array of real and complex values,\n"
|
"\t// where the top CWIDTH bits are the real value and the bottom\n"
|
"\t// where the top CWIDTH bits are the real value and the bottom\n"
|
"\t// CWIDTH bits are the imaginary value.\n"
|
"\t// CWIDTH bits are the imaginary value.\n"
|
"\t//\n"
|
"\t//\n"
|
"\t// cmem[i] = { (2^(CWIDTH-2)) * cos(2*pi*i/(2^LGWIDTH)),\n"
|
"\t// %scmem[i] = { (2^(CWIDTH-2)) * cos(2*pi*i/(2^LGWIDTH)),\n"
|
"\t// (2^(CWIDTH-2)) * sin(2*pi*i/(2^LGWIDTH)) };\n"
|
"\t// (2^(CWIDTH-2)) * sin(2*pi*i/(2^LGWIDTH)) };\n"
|
"\t//\n"
|
"\t//\n"
|
"\treg [(2*CWIDTH-1):0] %scmem [0:((1<<LGSPAN)-1)];\n"
|
"\treg [(2*CWIDTH-1):0] %scmem [0:((1<<LGSPAN)-1)];\n"
|
"\tinitial\t$readmemh(\"%scmem_%c%d.hex\",%scmem);\n\n",
|
"\tinitial\t$readmemh(\"%scmem_%c%d.hex\",%scmem);\n\n",
|
(inv)?"i":"", (inv)?"i":"",
|
(inv)?"i":"", (inv)?"i":"", (inv)?"i":"",
|
(inv)?"i":"", (odd)?'o':'e',stage<<1,
|
(inv)?"i":"", (odd)?'o':'e',stage<<1, (inv)?"i":"");
|
(inv)?"i":"");
|
|
{
|
{
|
FILE *cmem;
|
FILE *cmem;
|
|
|
{
|
{
|
char *memfile, *ptr;
|
char *memfile, *ptr;
|
|
|
memfile = new char[strlen(fname)+128];
|
memfile = new char[strlen(fname)+128];
|
strcpy(memfile, fname);
|
strcpy(memfile, fname);
|
if ((NULL != (ptr = strrchr(memfile, '/')))&&(ptr>memfile)) {
|
if ((NULL != (ptr = strrchr(memfile, '/')))&&(ptr>memfile)) {
|
ptr++;
|
ptr++;
|
sprintf(ptr, "%scmem_%c%d.hex", (inv)?"i":"", (odd)?'o':'e', stage*2);
|
sprintf(ptr, "%scmem_%c%d.hex", (inv)?"i":"", (odd)?'o':'e', stage*2);
|
} else {
|
} else {
|
sprintf(memfile, "%s/%scmem_%c%d.hex",
|
sprintf(memfile, "%s/%scmem_%c%d.hex",
|
COREDIR, (inv)?"i":"",
|
COREDIR, (inv)?"i":"",
|
(odd)?'o':'e', stage*2);
|
(odd)?'o':'e', stage*2);
|
}
|
}
|
// strcpy(&memfile[strlen(memfile)-2], ".hex");
|
// strcpy(&memfile[strlen(memfile)-2], ".hex");
|
cmem = fopen(memfile, "w");
|
cmem = fopen(memfile, "w");
|
if (NULL == cmem) {
|
if (NULL == cmem) {
|
fprintf(stderr, "Could not open/write \'%s\' with FFT coefficients.\n", memfile);
|
fprintf(stderr, "Could not open/write \'%s\' with FFT coefficients.\n", memfile);
|
perror("Err from O/S:");
|
perror("Err from O/S:");
|
exit(-2);
|
exit(-2);
|
}
|
}
|
|
|
delete[] memfile;
|
delete[] memfile;
|
}
|
}
|
// fprintf(cmem, "// CBITS = %d, inv = %s\n", cbits, (inv)?"true":"false");
|
// fprintf(cmem, "// CBITS = %d, inv = %s\n", cbits, (inv)?"true":"false");
|
for(int i=0; i<stage/2; i++) {
|
for(int i=0; i<stage/2; i++) {
|
int k = 2*i+odd;
|
int k = 2*i+odd;
|
double W = ((inv)?1:-1)*2.0*M_PI*k/(double)(2*stage);
|
double W = ((inv)?1:-1)*2.0*M_PI*k/(double)(2*stage);
|
double c, s;
|
double c, s;
|
long long ic, is, vl;
|
long long ic, is, vl;
|
|
|
c = cos(W); s = sin(W);
|
c = cos(W); s = sin(W);
|
ic = (long long)round((1ll<<(cbits-2)) * c);
|
ic = (long long)round((1ll<<(cbits-2)) * c);
|
is = (long long)round((1ll<<(cbits-2)) * s);
|
is = (long long)round((1ll<<(cbits-2)) * s);
|
vl = (ic & (~(-1ll << (cbits))));
|
vl = (ic & (~(-1ll << (cbits))));
|
vl <<= (cbits);
|
vl <<= (cbits);
|
vl |= (is & (~(-1ll << (cbits))));
|
vl |= (is & (~(-1ll << (cbits))));
|
fprintf(cmem, "%0*llx\n", ((cbits*2+3)/4), vl);
|
fprintf(cmem, "%0*llx\n", ((cbits*2+3)/4), vl);
|
/*
|
/*
|
fprintf(cmem, "%0*llx\t\t// %f+j%f -> %llx +j%llx\n",
|
fprintf(cmem, "%0*llx\t\t// %f+j%f -> %llx +j%llx\n",
|
((cbits*2+3)/4), vl, c, s,
|
((cbits*2+3)/4), vl, c, s,
|
ic & (~(-1ll<<(((cbits+3)/4)*4))),
|
ic & (~(-1ll<<(((cbits+3)/4)*4))),
|
is & (~(-1ll<<(((cbits+3)/4)*4))));
|
is & (~(-1ll<<(((cbits+3)/4)*4))));
|
*/
|
*/
|
} fclose(cmem);
|
} fclose(cmem);
|
}
|
}
|
|
|
fprintf(fstage,
|
fprintf(fstage,
|
"\treg [(LGWIDTH-2):0] iaddr;\n"
|
"\treg [(LGWIDTH-2):0] iaddr;\n"
|
"\treg [(2*IWIDTH-1):0] imem [0:((1<<LGSPAN)-1)];\n"
|
"\treg [(2*IWIDTH-1):0] imem [0:((1<<LGSPAN)-1)];\n"
|
"\n"
|
"\n"
|
"\treg [LGSPAN:0] oB;\n"
|
"\treg [LGSPAN:0] oB;\n"
|
"\treg [(2*OWIDTH-1):0] omem [0:((1<<LGSPAN)-1)];\n"
|
"\treg [(2*OWIDTH-1):0] omem [0:((1<<LGSPAN)-1)];\n"
|
"\n"
|
"\n"
|
"\talways @(posedge i_clk)\n"
|
"\talways @(posedge i_clk)\n"
|
"\t\tif (i_rst)\n"
|
"\t\tif (i_rst)\n"
|
"\t\tbegin\n"
|
"\t\tbegin\n"
|
"\t\t\twait_for_sync <= 1'b1;\n"
|
"\t\t\twait_for_sync <= 1'b1;\n"
|
"\t\t\tiaddr <= 0;\n"
|
"\t\t\tiaddr <= 0;\n"
|
"\t\t\tib_sync <= 1'b0;\n"
|
"\t\t\tib_sync <= 1'b0;\n"
|
"\t\tend\n"
|
"\t\tend\n"
|
"\t\telse if ((i_ce)&&((~wait_for_sync)||(i_sync)))\n"
|
"\t\telse if ((i_ce)&&((~wait_for_sync)||(i_sync)))\n"
|
"\t\tbegin\n"
|
"\t\tbegin\n"
|
"\t\t\t//\n"
|
"\t\t\t//\n"
|
"\t\t\t// First step: Record what we\'re not ready to use yet\n"
|
"\t\t\t// First step: Record what we\'re not ready to use yet\n"
|
"\t\t\t//\n"
|
"\t\t\t//\n"
|
"\t\t\timem[iaddr[(LGSPAN-1):0]] <= i_data;\n"
|
"\t\t\timem[iaddr[(LGSPAN-1):0]] <= i_data;\n"
|
"\t\t\tiaddr <= iaddr + 1;\n"
|
"\t\t\tiaddr <= iaddr + 1;\n"
|
"\t\t\twait_for_sync <= 1'b0;\n"
|
"\t\t\twait_for_sync <= 1'b0;\n"
|
"\t\tend\n\n");
|
"\t\tend\n\n");
|
|
|
fprintf(fstage,
|
fprintf(fstage,
|
"\t//\n"
|
"\t//\n"
|
"\t// Now, we have all the inputs, so let\'s feed the butterfly\n"
|
"\t// Now, we have all the inputs, so let\'s feed the butterfly\n"
|
"\t//\n"
|
"\t//\n"
|
"\talways\t@(posedge i_clk)\n"
|
"\talways\t@(posedge i_clk)\n"
|
|
"\tif (i_rst)\n"
|
|
"\t\tib_sync <= 1\'b0;\n"
|
|
"\telse if ((i_ce)&&(iaddr[LGSPAN]))\n"
|
|
"\t\tbegin\n"
|
|
"\t\t\t// Set the sync to true on the very first\n"
|
|
"\t\t\t// valid input in, and hence on the very\n"
|
|
"\t\t\t// first valid data out per FFT.\n"
|
|
"\t\t\tib_sync <= (iaddr==(1<<(LGSPAN)));\n"
|
|
"\t\tend\n"
|
|
"\talways\t@(posedge i_clk)\n"
|
"\tif ((i_ce)&&(iaddr[LGSPAN]))\n"
|
"\tif ((i_ce)&&(iaddr[LGSPAN]))\n"
|
"\t\tbegin\n"
|
"\t\tbegin\n"
|
"\t\t\t// One input from memory, ...\n"
|
"\t\t\t// One input from memory, ...\n"
|
"\t\t\tib_a <= imem[iaddr[(LGSPAN-1):0]];\n"
|
"\t\t\tib_a <= imem[iaddr[(LGSPAN-1):0]];\n"
|
"\t\t\t// One input clocked in from the top\n"
|
"\t\t\t// One input clocked in from the top\n"
|
"\t\t\tib_b <= i_data;\n"
|
"\t\t\tib_b <= i_data;\n"
|
"\t\t\t// Set the sync to true on the very first\n"
|
|
"\t\t\t// valid input in, and hence on the very\n"
|
|
"\t\t\t// first valid data out per FFT.\n"
|
|
"\t\t\tib_sync <= (iaddr==(1<<(LGSPAN)));\n"
|
|
"\t\t\tib_c <= %scmem[iaddr[(LGSPAN-1):0]];\n"
|
"\t\t\tib_c <= %scmem[iaddr[(LGSPAN-1):0]];\n"
|
"\t\tend\n\n", (inv)?"i":"");
|
"\t\tend\n\n", (inv)?"i":"");
|
|
|
if (hwmpy) {
|
if (hwmpy) {
|
fprintf(fstage,
|
fprintf(fstage,
|
"\thwbfly #(.IWIDTH(IWIDTH),.CWIDTH(CWIDTH),.OWIDTH(OWIDTH),\n"
|
"\thwbfly #(.IWIDTH(IWIDTH),.CWIDTH(CWIDTH),.OWIDTH(OWIDTH),\n"
|
"\t\t\t.SHIFT(BFLYSHIFT))\n"
|
"\t\t\t.SHIFT(BFLYSHIFT))\n"
|
"\t\tbfly(i_clk, i_rst, i_ce, ib_c,\n"
|
"\t\tbfly(i_clk, i_rst, i_ce, ib_c,\n"
|
"\t\t\tib_a, ib_b, ib_sync, ob_a, ob_b, ob_sync);\n");
|
"\t\t\tib_a, ib_b, ib_sync, ob_a, ob_b, ob_sync);\n");
|
} else {
|
} else {
|
fprintf(fstage,
|
fprintf(fstage,
|
"\tbutterfly #(.IWIDTH(IWIDTH),.CWIDTH(CWIDTH),.OWIDTH(OWIDTH),\n"
|
"\tbutterfly #(.IWIDTH(IWIDTH),.CWIDTH(CWIDTH),.OWIDTH(OWIDTH),\n"
|
"\t\t\t.MPYDELAY(%d\'d%d),.LGDELAY(LGBDLY),.SHIFT(BFLYSHIFT))\n"
|
"\t\t\t.MPYDELAY(%d\'d%d),.LGDELAY(LGBDLY),.SHIFT(BFLYSHIFT))\n"
|
"\t\tbfly(i_clk, i_rst, i_ce, ib_c,\n"
|
"\t\tbfly(i_clk, i_rst, i_ce, ib_c,\n"
|
"\t\t\tib_a, ib_b, ib_sync, ob_a, ob_b, ob_sync);\n",
|
"\t\t\tib_a, ib_b, ib_sync, ob_a, ob_b, ob_sync);\n",
|
lgdelay(nbits, xtra), bflydelay(nbits, xtra));
|
lgdelay(nbits, xtra), bflydelay(nbits, xtra));
|
}
|
}
|
|
|
fprintf(fstage,
|
fprintf(fstage,
|
"\t//\n"
|
"\t//\n"
|
"\t// Next step: recover the outputs from the butterfly\n"
|
"\t// Next step: recover the outputs from the butterfly\n"
|
"\t//\n"
|
"\t//\n"
|
"\talways\t@(posedge i_clk)\n"
|
"\talways\t@(posedge i_clk)\n"
|
"\t\tif (i_rst)\n"
|
"\t\tif (i_rst)\n"
|
"\t\tbegin\n"
|
"\t\tbegin\n"
|
"\t\t\toB <= 0;\n"
|
"\t\t\toB <= 0;\n"
|
"\t\t\to_sync <= 0;\n"
|
"\t\t\to_sync <= 0;\n"
|
"\t\t\tb_started <= 0;\n"
|
"\t\t\tb_started <= 0;\n"
|
"\t\tend else if (i_ce)\n"
|
"\t\tend else if (i_ce)\n"
|
"\t\tbegin\n"
|
"\t\tbegin\n"
|
"\t\t\tif ((ob_sync||b_started)&&(~oB[LGSPAN]))\n"
|
"\t\t\tif ((ob_sync||b_started)&&(~oB[LGSPAN]))\n"
|
"\t\t\tbegin // A butterfly output is available\n"
|
"\t\t\tbegin // A butterfly output is available\n"
|
"\t\t\t\tb_started <= 1'b1;\n"
|
"\t\t\t\tb_started <= 1'b1;\n"
|
"\t\t\t\tomem[oB[(LGSPAN-1):0]] <= ob_b;\n"
|
"\t\t\t\tomem[oB[(LGSPAN-1):0]] <= ob_b;\n"
|
"\t\t\t\toB <= oB+1;\n"
|
"\t\t\t\toB <= oB+1;\n"
|
"\n"
|
"\n"
|
"\t\t\t\to_sync <= (ob_sync);\n"
|
"\t\t\t\to_sync <= (ob_sync);\n"
|
"\t\t\t\to_data <= ob_a;\n"
|
"\t\t\t\to_data <= ob_a;\n"
|
"\t\t\tend else if (b_started)\n"
|
"\t\t\tend else if (b_started)\n"
|
"\t\t\tbegin // and keep outputting once you start--at a rate\n"
|
"\t\t\tbegin // and keep outputting once you start--at a rate\n"
|
"\t\t\t// of one guaranteed output per clock that has i_ce set.\n"
|
"\t\t\t// of one guaranteed output per clock that has i_ce set.\n"
|
"\t\t\t\to_data <= omem[oB[(LGSPAN-1):0]];\n"
|
"\t\t\t\to_data <= omem[oB[(LGSPAN-1):0]];\n"
|
"\t\t\t\toB <= oB + 1;\n"
|
"\t\t\t\toB <= oB + 1;\n"
|
"\t\t\t\to_sync <= 1'b0;\n"
|
"\t\t\t\to_sync <= 1'b0;\n"
|
"\t\t\tend else\n"
|
"\t\t\tend else\n"
|
"\t\t\t\to_sync <= 1'b0;\n"
|
"\t\t\t\to_sync <= 1'b0;\n"
|
"\t\tend\n\n");
|
"\t\tend\n\n");
|
fprintf(fstage, "endmodule\n");
|
fprintf(fstage, "endmodule\n");
|
}
|
}
|
|
|
void usage(void) {
|
void usage(void) {
|
fprintf(stderr,
|
fprintf(stderr,
|
"USAGE:\tfftgen [-f <size>] [-d dir] [-c cbits] [-n nbits] [-m mxbits] [-s01]\n"
|
"USAGE:\tfftgen [-f <size>] [-d dir] [-c cbits] [-n nbits] [-m mxbits] [-s01]\n"
|
// "\tfftgen -i\n"
|
// "\tfftgen -i\n"
|
"\t-c <cbits>\tCauses all internal complex coefficients to be\n"
|
"\t-c <cbits>\tCauses all internal complex coefficients to be\n"
|
"\t\tlonger than the corresponding data bits, to help avoid\n"
|
"\t\tlonger than the corresponding data bits, to help avoid\n"
|
"\t\tcoefficient truncation errors.\n"
|
"\t\tcoefficient truncation errors.\n"
|
"\t-d <dir>\tPlaces all of the generated verilog files into <dir>.\n"
|
"\t-d <dir>\tPlaces all of the generated verilog files into <dir>.\n"
|
"\t-f <size>\tSets the size of the FFT as the number of complex\n"
|
"\t-f <size>\tSets the size of the FFT as the number of complex\n"
|
"\t\tsamples input to the transform.\n"
|
"\t\tsamples input to the transform.\n"
|
"\t-n <nbits>\tSets the number of bits in the twos complement input\n"
|
|
"\t\tto the FFT routine.\n"
|
|
"\t-m <mxbits>\tSets the maximum bit width that the FFT should ever\n"
|
"\t-m <mxbits>\tSets the maximum bit width that the FFT should ever\n"
|
"\t\tproduce. Internal values greater than this value will be\n"
|
"\t\tproduce. Internal values greater than this value will be\n"
|
"\t\ttruncated to this value.\n"
|
"\t\ttruncated to this value.\n"
|
"\t-n <nbits>\tSets the bitwidth for values coming into the (i)FFT.\n"
|
"\t-n <nbits>\tSets the bitwidth for values coming into the (i)FFT.\n"
|
"\t-p <nmpy>\tSets the number of stages that will use any hardware \n"
|
"\t-p <nmpy>\tSets the number of stages that will use any hardware \n"
|
"\t\tmultiplication facility, instead of shift-add emulation.\n"
|
"\t\tmultiplication facility, instead of shift-add emulation.\n"
|
"\t-s\tSkip the final bit reversal stage. This is useful in\n"
|
"\t-s\tSkip the final bit reversal stage. This is useful in\n"
|
"\t\talgorithms that need to apply a filter without needing to do\n"
|
"\t\talgorithms that need to apply a filter without needing to do\n"
|
"\t\tbin shifting, as these algorithms can, with this option, just\n"
|
"\t\tbin shifting, as these algorithms can, with this option, just\n"
|
"\t\tmultiply by a bit reversed correlation sequence and then\n"
|
"\t\tmultiply by a bit reversed correlation sequence and then\n"
|
"\t\tinverse FFT the (still bit reversed) result. (You would need\n"
|
"\t\tinverse FFT the (still bit reversed) result. (You would need\n"
|
"\t\ta decimation in time inverse to do this, which this program does\n"
|
"\t\ta decimation in time inverse to do this, which this program does\n"
|
"\t\tnot yet provide.)\n"
|
"\t\tnot yet provide.)\n"
|
"\t-S\tInclude the final bit reversal stage (default).\n"
|
"\t-S\tInclude the final bit reversal stage (default).\n"
|
"\t-x <xtrabits>\tUse this many extra bits internally, before any final\n"
|
"\t-x <xtrabits>\tUse this many extra bits internally, before any final\n"
|
"\t\trounding or truncation of the answer to the final number of bits.\n"
|
"\t\trounding or truncation of the answer to the final number of bits.\n"
|
"\t-0\tA forward FFT (default), meaning that the coefficients are\n"
|
"\t-0\tA forward FFT (default), meaning that the coefficients are\n"
|
"\t\tgiven by e^{-j 2 pi k/N n }.\n"
|
"\t\tgiven by e^{-j 2 pi k/N n }.\n"
|
"\t-1\tAn inverse FFT, meaning that the coefficients are\n"
|
"\t-1\tAn inverse FFT, meaning that the coefficients are\n"
|
"\t\tgiven by e^{ j 2 pi k/N n }.\n");
|
"\t\tgiven by e^{ j 2 pi k/N n }.\n");
|
}
|
}
|
|
|
// Features still needed:
|
// Features still needed:
|
// Interactivity.
|
// Interactivity.
|
// Some number of maximum bits, beyond which we won't accumulate any more.
|
|
// Obviously, the build_stage above.
|
|
// Copying the files of interest into the fft-core directory, from
|
|
// whatever directory this file is run out of.
|
|
int main(int argc, char **argv) {
|
int main(int argc, char **argv) {
|
int fftsize = -1, lgsize = -1;
|
int fftsize = -1, lgsize = -1;
|
int nbitsin = 16, xtracbits = 4, nummpy=0, nonmpy=2;
|
int nbitsin = 16, xtracbits = 4, nummpy=0, nonmpy=2;
|
int nbitsout, maxbitsout = -1, xtrapbits=0;
|
int nbitsout, maxbitsout = -1, xtrapbits=0;
|
bool bitreverse = true, inverse=false, interactive = false,
|
bool bitreverse = true, inverse=false, interactive = false,
|
verbose_flag = false;
|
verbose_flag = false;
|
FILE *vmain;
|
FILE *vmain;
|
std::string coredir = "fft-core", cmdline = "";
|
std::string coredir = "fft-core", cmdline = "";
|
ROUND_T rounding = RND_CONVERGENT;
|
ROUND_T rounding = RND_CONVERGENT;
|
// ROUND_T rounding = RND_HALFUP;
|
// ROUND_T rounding = RND_HALFUP;
|
|
|
if (argc <= 1)
|
if (argc <= 1)
|
usage();
|
usage();
|
|
|
cmdline = argv[0];
|
cmdline = argv[0];
|
for(int argn=1; argn<argc; argn++) {
|
for(int argn=1; argn<argc; argn++) {
|
cmdline += " ";
|
cmdline += " ";
|
cmdline += argv[argn];
|
cmdline += argv[argn];
|
}
|
}
|
|
|
for(int argn=1; argn<argc; argn++) {
|
for(int argn=1; argn<argc; argn++) {
|
if ('-' == argv[argn][0]) {
|
if ('-' == argv[argn][0]) {
|
for(int j=1; (argv[argn][j])&&(j<100); j++) {
|
for(int j=1; (argv[argn][j])&&(j<100); j++) {
|
switch(argv[argn][j]) {
|
switch(argv[argn][j]) {
|
case '0':
|
case '0':
|
inverse = false;
|
inverse = false;
|
break;
|
break;
|
case '1':
|
case '1':
|
inverse = true;
|
inverse = true;
|
break;
|
break;
|
case 'c':
|
case 'c':
|
if (argn+1 >= argc) {
|
if (argn+1 >= argc) {
|
printf("ERR: No extra number of coefficient bits given!\n\n");
|
printf("ERR: No extra number of coefficient bits given!\n\n");
|
usage(); exit(-1);
|
usage(); exit(-1);
|
}
|
}
|
xtracbits = atoi(argv[++argn]);
|
xtracbits = atoi(argv[++argn]);
|
j+= 200;
|
j+= 200;
|
break;
|
break;
|
case 'd':
|
case 'd':
|
if (argn+1 >= argc) {
|
if (argn+1 >= argc) {
|
printf("ERR: No directory given into which to place the core!\n\n");
|
printf("ERR: No directory given into which to place the core!\n\n");
|
usage(); exit(-1);
|
usage(); exit(-1);
|
}
|
}
|
coredir = argv[++argn];
|
coredir = argv[++argn];
|
j += 200;
|
j += 200;
|
break;
|
break;
|
case 'f':
|
case 'f':
|
if (argn+1 >= argc) {
|
if (argn+1 >= argc) {
|
printf("ERR: No FFT Size given!\n\n");
|
printf("ERR: No FFT Size given!\n\n");
|
usage(); exit(-1);
|
usage(); exit(-1);
|
}
|
}
|
fftsize = atoi(argv[++argn]);
|
fftsize = atoi(argv[++argn]);
|
{ int sln = strlen(argv[argn]);
|
{ int sln = strlen(argv[argn]);
|
if (!isdigit(argv[argn][sln-1])){
|
if (!isdigit(argv[argn][sln-1])){
|
switch(argv[argn][sln-1]) {
|
switch(argv[argn][sln-1]) {
|
case 'k': case 'K':
|
case 'k': case 'K':
|
fftsize <<= 10;
|
fftsize <<= 10;
|
break;
|
break;
|
case 'm': case 'M':
|
case 'm': case 'M':
|
fftsize <<= 20;
|
fftsize <<= 20;
|
break;
|
break;
|
case 'g': case 'G':
|
case 'g': case 'G':
|
fftsize <<= 30;
|
fftsize <<= 30;
|
break;
|
break;
|
default:
|
default:
|
printf("ERR: Unknown FFT size, %s!\n", argv[argn]);
|
printf("ERR: Unknown FFT size, %s!\n", argv[argn]);
|
exit(-1);
|
exit(-1);
|
}
|
}
|
}}
|
}}
|
j += 200;
|
j += 200;
|
break;
|
break;
|
case 'h':
|
case 'h':
|
usage();
|
usage();
|
exit(0);
|
exit(0);
|
break;
|
break;
|
case 'i':
|
case 'i':
|
interactive = true;
|
interactive = true;
|
break;
|
break;
|
case 'm':
|
case 'm':
|
if (argn+1 >= argc) {
|
if (argn+1 >= argc) {
|
printf("ERR: No maximum output bit value given!\n\n");
|
printf("ERR: No maximum output bit value given!\n\n");
|
exit(-1);
|
exit(-1);
|
}
|
}
|
maxbitsout = atoi(argv[++argn]);
|
maxbitsout = atoi(argv[++argn]);
|
j += 200;
|
j += 200;
|
break;
|
break;
|
case 'n':
|
case 'n':
|
if (argn+1 >= argc) {
|
if (argn+1 >= argc) {
|
printf("ERR: No input bit size given!\n\n");
|
printf("ERR: No input bit size given!\n\n");
|
exit(-1);
|
exit(-1);
|
}
|
}
|
nbitsin = atoi(argv[++argn]);
|
nbitsin = atoi(argv[++argn]);
|
j += 200;
|
j += 200;
|
break;
|
break;
|
case 'p':
|
case 'p':
|
if (argn+1 >= argc) {
|
if (argn+1 >= argc) {
|
printf("ERR: No number given for number of hardware multiply stages!\n\n");
|
printf("ERR: No number given for number of hardware multiply stages!\n\n");
|
exit(-1);
|
exit(-1);
|
}
|
}
|
nummpy = atoi(argv[++argn]);
|
nummpy = atoi(argv[++argn]);
|
j += 200;
|
j += 200;
|
break;
|
break;
|
case 'S':
|
case 'S':
|
bitreverse = true;
|
bitreverse = true;
|
break;
|
break;
|
case 's':
|
case 's':
|
bitreverse = false;
|
bitreverse = false;
|
break;
|
break;
|
case 'x':
|
case 'x':
|
if (argn+1 >= argc) {
|
if (argn+1 >= argc) {
|
printf("ERR: No extra number of bits given!\n\n");
|
printf("ERR: No extra number of bits given!\n\n");
|
usage(); exit(-1);
|
usage(); exit(-1);
|
} j+= 200;
|
} j+= 200;
|
xtrapbits = atoi(argv[++argn]);
|
xtrapbits = atoi(argv[++argn]);
|
break;
|
break;
|
case 'v':
|
case 'v':
|
verbose_flag = true;
|
verbose_flag = true;
|
break;
|
break;
|
default:
|
default:
|
printf("Unknown argument, -%c\n", argv[argn][j]);
|
printf("Unknown argument, -%c\n", argv[argn][j]);
|
usage();
|
usage();
|
exit(-1);
|
exit(-1);
|
}
|
}
|
}
|
}
|
} else {
|
} else {
|
printf("Unrecognized argument, %s\n", argv[argn]);
|
printf("Unrecognized argument, %s\n", argv[argn]);
|
usage();
|
usage();
|
exit(-1);
|
exit(-1);
|
}
|
}
|
}
|
}
|
|
|
if ((lgsize < 0)&&(fftsize > 1)) {
|
if ((lgsize < 0)&&(fftsize > 1)) {
|
for(lgsize=1; (1<<lgsize) < fftsize; lgsize++)
|
for(lgsize=1; (1<<lgsize) < fftsize; lgsize++)
|
;
|
;
|
}
|
}
|
|
|
if ((fftsize <= 0)||(nbitsin < 1)||(nbitsin>48)) {
|
if ((fftsize <= 0)||(nbitsin < 1)||(nbitsin>48)) {
|
printf("INVALID PARAMETERS!!!!\n");
|
printf("INVALID PARAMETERS!!!!\n");
|
exit(-1);
|
exit(-1);
|
}
|
}
|
|
|
|
|
if (nextlg(fftsize) != fftsize) {
|
if (nextlg(fftsize) != fftsize) {
|
fprintf(stderr, "ERR: FFTSize (%d) *must* be a power of two\n",
|
fprintf(stderr, "ERR: FFTSize (%d) *must* be a power of two\n",
|
fftsize);
|
fftsize);
|
exit(-1);
|
exit(-1);
|
} else if (fftsize < 2) {
|
} else if (fftsize < 2) {
|
fprintf(stderr, "ERR: Minimum FFTSize is 2, not %d\n",
|
fprintf(stderr, "ERR: Minimum FFTSize is 2, not %d\n",
|
fftsize);
|
fftsize);
|
if (fftsize == 1) {
|
if (fftsize == 1) {
|
fprintf(stderr, "You do realize that a 1 point FFT makes very little sense\n");
|
fprintf(stderr, "You do realize that a 1 point FFT makes very little sense\n");
|
fprintf(stderr, "in an FFT operation that handles two samples per clock?\n");
|
fprintf(stderr, "in an FFT operation that handles two samples per clock?\n");
|
fprintf(stderr, "If you really need to do an FFT of this size, the output\n");
|
fprintf(stderr, "If you really need to do an FFT of this size, the output\n");
|
fprintf(stderr, "can be connected straight to the input.\n");
|
fprintf(stderr, "can be connected straight to the input.\n");
|
} else {
|
} else {
|
fprintf(stderr, "Indeed, a size of %d doesn\'t make much sense to me at all.\n", fftsize);
|
fprintf(stderr, "Indeed, a size of %d doesn\'t make much sense to me at all.\n", fftsize);
|
fprintf(stderr, "Is such an operation even defined?\n");
|
fprintf(stderr, "Is such an operation even defined?\n");
|
}
|
}
|
exit(-1);
|
exit(-1);
|
}
|
}
|
|
|
// Calculate how many output bits we'll have, and what the log
|
// Calculate how many output bits we'll have, and what the log
|
// based two size of our FFT is.
|
// based two size of our FFT is.
|
{
|
{
|
int tmp_size = fftsize;
|
int tmp_size = fftsize;
|
|
|
// The first stage always accumulates one bit, regardless
|
// The first stage always accumulates one bit, regardless
|
// of whether you need to or not.
|
// of whether you need to or not.
|
nbitsout = nbitsin + 1;
|
nbitsout = nbitsin + 1;
|
tmp_size >>= 1;
|
tmp_size >>= 1;
|
|
|
while(tmp_size > 4) {
|
while(tmp_size > 4) {
|
nbitsout += 1;
|
nbitsout += 1;
|
tmp_size >>= 2;
|
tmp_size >>= 2;
|
}
|
}
|
|
|
if (tmp_size > 1)
|
if (tmp_size > 1)
|
nbitsout ++;
|
nbitsout ++;
|
|
|
if (fftsize <= 2)
|
if (fftsize <= 2)
|
bitreverse = false;
|
bitreverse = false;
|
} if ((maxbitsout > 0)&&(nbitsout > maxbitsout))
|
} if ((maxbitsout > 0)&&(nbitsout > maxbitsout))
|
nbitsout = maxbitsout;
|
nbitsout = maxbitsout;
|
|
|
// Figure out how many multiply stages to use, and how many to skip
|
// Figure out how many multiply stages to use, and how many to skip
|
{
|
{
|
int lgv = lgval(fftsize);
|
int lgv = lgval(fftsize);
|
|
|
nonmpy = lgv - nummpy;
|
nonmpy = lgv - nummpy;
|
if (nonmpy < 2) nonmpy = 2;
|
if (nonmpy < 2) nonmpy = 2;
|
nummpy = lgv - nonmpy;
|
nummpy = lgv - nonmpy;
|
}
|
}
|
|
|
{
|
{
|
struct stat sbuf;
|
struct stat sbuf;
|
if (lstat(coredir.c_str(), &sbuf)==0) {
|
if (lstat(coredir.c_str(), &sbuf)==0) {
|
if (!S_ISDIR(sbuf.st_mode)) {
|
if (!S_ISDIR(sbuf.st_mode)) {
|
fprintf(stderr, "\'%s\' already exists, and is not a directory!\n", coredir.c_str());
|
fprintf(stderr, "\'%s\' already exists, and is not a directory!\n", coredir.c_str());
|
fprintf(stderr, "I will stop now, lest I overwrite something you care about.\n");
|
fprintf(stderr, "I will stop now, lest I overwrite something you care about.\n");
|
fprintf(stderr, "To try again, please remove this file.\n");
|
fprintf(stderr, "To try again, please remove this file.\n");
|
exit(-1);
|
exit(-1);
|
}
|
}
|
} else
|
} else
|
mkdir(coredir.c_str(), 0755);
|
mkdir(coredir.c_str(), 0755);
|
if (access(coredir.c_str(), X_OK|W_OK) != 0) {
|
if (access(coredir.c_str(), X_OK|W_OK) != 0) {
|
fprintf(stderr, "I have no access to the directory \'%s\'.\n", coredir.c_str());
|
fprintf(stderr, "I have no access to the directory \'%s\'.\n", coredir.c_str());
|
exit(-1);
|
exit(-1);
|
}
|
}
|
}
|
}
|
|
|
{
|
{
|
std::string fname_string;
|
std::string fname_string;
|
|
|
fname_string = coredir;
|
fname_string = coredir;
|
fname_string += "/";
|
fname_string += "/";
|
if (inverse) fname_string += "i";
|
if (inverse) fname_string += "i";
|
fname_string += "fftmain.v";
|
fname_string += "fftmain.v";
|
|
|
vmain = fopen(fname_string.c_str(), "w");
|
vmain = fopen(fname_string.c_str(), "w");
|
if (NULL == vmain) {
|
if (NULL == vmain) {
|
fprintf(stderr, "Could not open \'%s\' for writing\n", fname_string.c_str());
|
fprintf(stderr, "Could not open \'%s\' for writing\n", fname_string.c_str());
|
perror("Err from O/S:");
|
perror("Err from O/S:");
|
exit(-1);
|
exit(-1);
|
}
|
}
|
}
|
}
|
|
|
fprintf(vmain, "/////////////////////////////////////////////////////////////////////////////\n");
|
fprintf(vmain, "/////////////////////////////////////////////////////////////////////////////\n");
|
fprintf(vmain, "//\n");
|
fprintf(vmain, "//\n");
|
fprintf(vmain, "// Filename: %sfftmain.v\n", (inverse)?"i":"");
|
fprintf(vmain, "// Filename: %sfftmain.v\n", (inverse)?"i":"");
|
fprintf(vmain, "//\n");
|
fprintf(vmain, "//\n");
|
fprintf(vmain, "// Project: %s\n", prjname);
|
fprintf(vmain, "// Project: %s\n", prjname);
|
fprintf(vmain, "//\n");
|
fprintf(vmain, "//\n");
|
fprintf(vmain, "// Purpose: This is the main module in the Doubletime FPGA FFT project.\n");
|
fprintf(vmain, "// Purpose: This is the main module in the Doubletime FPGA FFT project.\n");
|
fprintf(vmain, "// As such, all other modules are subordinate to this one.\n");
|
fprintf(vmain, "// As such, all other modules are subordinate to this one.\n");
|
fprintf(vmain, "// (I have been reading too much legalese this week ...)\n");
|
fprintf(vmain, "// (I have been reading too much legalese this week ...)\n");
|
fprintf(vmain, "// This module accomplish a fixed size Complex FFT on %d data\n", fftsize);
|
fprintf(vmain, "// This module accomplish a fixed size Complex FFT on %d data\n", fftsize);
|
fprintf(vmain, "// points. The FFT is fully pipelined, and accepts as inputs\n");
|
fprintf(vmain, "// points. The FFT is fully pipelined, and accepts as inputs\n");
|
fprintf(vmain, "// two complex two\'s complement samples per clock.\n");
|
fprintf(vmain, "// two complex two\'s complement samples per clock.\n");
|
fprintf(vmain, "//\n");
|
fprintf(vmain, "//\n");
|
fprintf(vmain, "// Parameters:\n");
|
fprintf(vmain, "// Parameters:\n");
|
fprintf(vmain, "// i_clk\tThe clock. All operations are synchronous with this clock.\n");
|
fprintf(vmain, "// i_clk\tThe clock. All operations are synchronous with this clock.\n");
|
fprintf(vmain, "//\ti_rst\tSynchronous reset, active high. Setting this line will\n");
|
fprintf(vmain, "//\ti_rst\tSynchronous reset, active high. Setting this line will\n");
|
fprintf(vmain, "//\t\t\tforce the reset of all of the internals to this routine.\n");
|
fprintf(vmain, "//\t\t\tforce the reset of all of the internals to this routine.\n");
|
fprintf(vmain, "//\t\t\tFurther, following a reset, the o_sync line will go\n");
|
fprintf(vmain, "//\t\t\tFurther, following a reset, the o_sync line will go\n");
|
fprintf(vmain, "//\t\t\thigh the same time the first output sample is valid.\n");
|
fprintf(vmain, "//\t\t\thigh the same time the first output sample is valid.\n");
|
fprintf(vmain, "// i_ce\tA clock enable line. If this line is set, this module\n");
|
fprintf(vmain, "// i_ce\tA clock enable line. If this line is set, this module\n");
|
fprintf(vmain, "//\t\t\twill accept two complex values as inputs, and produce\n");
|
fprintf(vmain, "//\t\t\twill accept two complex values as inputs, and produce\n");
|
fprintf(vmain, "//\t\t\ttwo (possibly empty) complex values as outputs.\n");
|
fprintf(vmain, "//\t\t\ttwo (possibly empty) complex values as outputs.\n");
|
fprintf(vmain, "//\t\ti_left\tThe first of two complex input samples. This value\n");
|
fprintf(vmain, "//\t\ti_left\tThe first of two complex input samples. This value\n");
|
fprintf(vmain, "//\t\t\tis split into two two\'s complement numbers, of \n");
|
fprintf(vmain, "//\t\t\tis split into two two\'s complement numbers, of \n");
|
fprintf(vmain, "//\t\t\t%d bits each, with the real portion in the high\n", nbitsin);
|
fprintf(vmain, "//\t\t\t%d bits each, with the real portion in the high\n", nbitsin);
|
fprintf(vmain, "//\t\t\torder bits, and the imaginary portion taking the\n");
|
fprintf(vmain, "//\t\t\torder bits, and the imaginary portion taking the\n");
|
fprintf(vmain, "//\t\t\tbottom %d bits.\n", nbitsin);
|
fprintf(vmain, "//\t\t\tbottom %d bits.\n", nbitsin);
|
fprintf(vmain, "//\t\ti_right\tThis is the same thing as i_left, only this is the\n");
|
fprintf(vmain, "//\t\ti_right\tThis is the same thing as i_left, only this is the\n");
|
fprintf(vmain, "//\t\t\tsecond of two such samples. Hence, i_left would\n");
|
fprintf(vmain, "//\t\t\tsecond of two such samples. Hence, i_left would\n");
|
fprintf(vmain, "//\t\t\tcontain input sample zero, i_right would contain\n");
|
fprintf(vmain, "//\t\t\tcontain input sample zero, i_right would contain\n");
|
fprintf(vmain, "//\t\t\tsample one. On the next clock i_left would contain\n");
|
fprintf(vmain, "//\t\t\tsample one. On the next clock i_left would contain\n");
|
fprintf(vmain, "//\t\t\tinput sample two, i_right number three and so forth.\n");
|
fprintf(vmain, "//\t\t\tinput sample two, i_right number three and so forth.\n");
|
fprintf(vmain, "//\t\to_left\tThe first of two output samples, of the same\n");
|
fprintf(vmain, "//\t\to_left\tThe first of two output samples, of the same\n");
|
fprintf(vmain, "//\t\t\tformat as i_left, only having %d bits for each of\n", nbitsout);
|
fprintf(vmain, "//\t\t\tformat as i_left, only having %d bits for each of\n", nbitsout);
|
fprintf(vmain, "//\t\t\tthe real and imaginary components, leading to %d\n", nbitsout*2);
|
fprintf(vmain, "//\t\t\tthe real and imaginary components, leading to %d\n", nbitsout*2);
|
fprintf(vmain, "//\t\t\tbits total.\n");
|
fprintf(vmain, "//\t\t\tbits total.\n");
|
fprintf(vmain, "//\t\to_right\tThe second of two output samples produced each clock.\n");
|
fprintf(vmain, "//\t\to_right\tThe second of two output samples produced each clock.\n");
|
fprintf(vmain, "//\t\t\tThis has the same format as o_left.\n");
|
fprintf(vmain, "//\t\t\tThis has the same format as o_left.\n");
|
fprintf(vmain, "//\t\to_sync\tA one bit output indicating the first valid sample\n");
|
fprintf(vmain, "//\t\to_sync\tA one bit output indicating the first valid sample\n");
|
fprintf(vmain, "//\t\t\tproduced by this FFT following a reset. Ever after,\n");
|
fprintf(vmain, "//\t\t\tproduced by this FFT following a reset. Ever after,\n");
|
fprintf(vmain, "//\t\t\tthis will indicate the first sample of an FFT frame.\n");
|
fprintf(vmain, "//\t\t\tthis will indicate the first sample of an FFT frame.\n");
|
fprintf(vmain, "//\n");
|
fprintf(vmain, "//\n");
|
fprintf(vmain, "// Arguments:\tThis file was computer generated using the\n");
|
fprintf(vmain, "// Arguments:\tThis file was computer generated using the\n");
|
fprintf(vmain, "//\t\tfollowing command line:\n");
|
fprintf(vmain, "//\t\tfollowing command line:\n");
|
fprintf(vmain, "//\n");
|
fprintf(vmain, "//\n");
|
fprintf(vmain, "//\t\t%% %s\n", cmdline.c_str());
|
fprintf(vmain, "//\t\t%% %s\n", cmdline.c_str());
|
fprintf(vmain, "//\n");
|
fprintf(vmain, "//\n");
|
fprintf(vmain, "%s", creator);
|
fprintf(vmain, "%s", creator);
|
fprintf(vmain, "//\n");
|
fprintf(vmain, "//\n");
|
fprintf(vmain, "%s", cpyleft);
|
fprintf(vmain, "%s", cpyleft);
|
|
|
|
|
fprintf(vmain, "//\n");
|
fprintf(vmain, "//\n");
|
fprintf(vmain, "//\n");
|
fprintf(vmain, "//\n");
|
fprintf(vmain, "module %sfftmain(i_clk, i_rst, i_ce,\n", (inverse)?"i":"");
|
fprintf(vmain, "module %sfftmain(i_clk, i_rst, i_ce,\n", (inverse)?"i":"");
|
fprintf(vmain, "\t\ti_left, i_right,\n");
|
fprintf(vmain, "\t\ti_left, i_right,\n");
|
fprintf(vmain, "\t\to_left, o_right, o_sync);\n");
|
fprintf(vmain, "\t\to_left, o_right, o_sync);\n");
|
fprintf(vmain, "\tparameter\tIWIDTH=%d, OWIDTH=%d, LGWIDTH=%d;\n", nbitsin, nbitsout, lgsize);
|
fprintf(vmain, "\tparameter\tIWIDTH=%d, OWIDTH=%d, LGWIDTH=%d;\n", nbitsin, nbitsout, lgsize);
|
assert(lgsize > 0);
|
assert(lgsize > 0);
|
fprintf(vmain, "\tinput\t\ti_clk, i_rst, i_ce;\n");
|
fprintf(vmain, "\tinput\t\ti_clk, i_rst, i_ce;\n");
|
fprintf(vmain, "\tinput\t\t[(2*IWIDTH-1):0]\ti_left, i_right;\n");
|
fprintf(vmain, "\tinput\t\t[(2*IWIDTH-1):0]\ti_left, i_right;\n");
|
fprintf(vmain, "\toutput\treg\t[(2*OWIDTH-1):0]\to_left, o_right;\n");
|
fprintf(vmain, "\toutput\treg\t[(2*OWIDTH-1):0]\to_left, o_right;\n");
|
fprintf(vmain, "\toutput\treg\t\t\to_sync;\n");
|
fprintf(vmain, "\toutput\treg\t\t\to_sync;\n");
|
fprintf(vmain, "\n\n");
|
fprintf(vmain, "\n\n");
|
|
|
fprintf(vmain, "\t// Outputs of the FFT, ready for bit reversal.\n");
|
fprintf(vmain, "\t// Outputs of the FFT, ready for bit reversal.\n");
|
fprintf(vmain, "\twire\t[(2*OWIDTH-1):0]\tbr_left, br_right;\n");
|
fprintf(vmain, "\twire\t[(2*OWIDTH-1):0]\tbr_left, br_right;\n");
|
fprintf(vmain, "\n\n");
|
fprintf(vmain, "\n\n");
|
|
|
int tmp_size = fftsize, lgtmp = lgsize;
|
int tmp_size = fftsize, lgtmp = lgsize;
|
if (fftsize == 2) {
|
if (fftsize == 2) {
|
if (bitreverse) {
|
if (bitreverse) {
|
fprintf(vmain, "\treg\tbr_start;\n");
|
fprintf(vmain, "\treg\tbr_start;\n");
|
fprintf(vmain, "\talways @(posedge i_clk)\n");
|
fprintf(vmain, "\talways @(posedge i_clk)\n");
|
fprintf(vmain, "\t\tif (i_rst)\n");
|
fprintf(vmain, "\t\tif (i_rst)\n");
|
fprintf(vmain, "\t\t\tbr_start <= 1'b0;\n");
|
fprintf(vmain, "\t\t\tbr_start <= 1'b0;\n");
|
fprintf(vmain, "\t\telse if (i_ce)\n");
|
fprintf(vmain, "\t\telse if (i_ce)\n");
|
fprintf(vmain, "\t\t\tbr_start <= 1'b1;\n");
|
fprintf(vmain, "\t\t\tbr_start <= 1'b1;\n");
|
}
|
}
|
fprintf(vmain, "\n\n");
|
fprintf(vmain, "\n\n");
|
fprintf(vmain, "\tdblstage\t#(IWIDTH)\tstage_2(i_clk, i_rst, i_ce,\n");
|
fprintf(vmain, "\tdblstage\t#(IWIDTH)\tstage_2(i_clk, i_rst, i_ce,\n");
|
fprintf(vmain, "\t\t\t(~i_rst), i_left, i_right, br_left, br_right);\n");
|
fprintf(vmain, "\t\t\t(~i_rst), i_left, i_right, br_left, br_right);\n");
|
fprintf(vmain, "\n\n");
|
fprintf(vmain, "\n\n");
|
} else {
|
} else {
|
int nbits = nbitsin, dropbit=0;
|
int nbits = nbitsin, dropbit=0;
|
// Always do a first stage
|
// Always do a first stage
|
fprintf(vmain, "\n\n");
|
fprintf(vmain, "\n\n");
|
fprintf(vmain, "\twire\t\tw_s%d, w_os%d;\n", fftsize, fftsize);
|
fprintf(vmain, "\twire\t\tw_s%d, w_os%d;\n", fftsize, fftsize);
|
fprintf(vmain, "\twire\t[%d:0]\tw_e%d, w_o%d;\n", 2*(nbits+1+xtrapbits)-1, fftsize, fftsize);
|
fprintf(vmain, "\twire\t[%d:0]\tw_e%d, w_o%d;\n", 2*(nbits+1+xtrapbits)-1, fftsize, fftsize);
|
fprintf(vmain, "\t%sfftstage_e%d\t#(IWIDTH,IWIDTH+%d,%d,%d,%d,%d,0)\tstage_e%d(i_clk, i_rst, i_ce,\n",
|
fprintf(vmain, "\t%sfftstage_e%d\t#(IWIDTH,IWIDTH+%d,%d,%d,%d,%d,0)\tstage_e%d(i_clk, i_rst, i_ce,\n",
|
(inverse)?"i":"", fftsize,
|
(inverse)?"i":"", fftsize,
|
xtracbits, nbits+1+xtrapbits,
|
xtracbits, nbits+1+xtrapbits,
|
lgsize, lgtmp-2, lgdelay(nbits,xtracbits),
|
lgsize, lgtmp-2, lgdelay(nbits,xtracbits),
|
fftsize);
|
fftsize);
|
fprintf(vmain, "\t\t\t(~i_rst), i_left, w_e%d, w_s%d);\n", fftsize, fftsize);
|
fprintf(vmain, "\t\t\t(~i_rst), i_left, w_e%d, w_s%d);\n", fftsize, fftsize);
|
fprintf(vmain, "\t%sfftstage_o%d\t#(IWIDTH,IWIDTH+%d,%d,%d,%d,%d,0)\tstage_o%d(i_clk, i_rst, i_ce,\n",
|
fprintf(vmain, "\t%sfftstage_o%d\t#(IWIDTH,IWIDTH+%d,%d,%d,%d,%d,0)\tstage_o%d(i_clk, i_rst, i_ce,\n",
|
(inverse)?"i":"", fftsize,
|
(inverse)?"i":"", fftsize,
|
xtracbits, nbits+1+xtrapbits,
|
xtracbits, nbits+1+xtrapbits,
|
lgsize, lgtmp-2, lgdelay(nbits,xtracbits),
|
lgsize, lgtmp-2, lgdelay(nbits,xtracbits),
|
fftsize);
|
fftsize);
|
fprintf(vmain, "\t\t\t(~i_rst), i_right, w_o%d, w_os%d);\n", fftsize, fftsize);
|
fprintf(vmain, "\t\t\t(~i_rst), i_right, w_o%d, w_os%d);\n", fftsize, fftsize);
|
fprintf(vmain, "\n\n");
|
fprintf(vmain, "\n\n");
|
|
|
{
|
{
|
std::string fname;
|
std::string fname;
|
char numstr[12];
|
char numstr[12];
|
bool mpystage;
|
bool mpystage;
|
|
|
// Last two stages are always non-multiply stages
|
// Last two stages are always non-multiply stages
|
// since the multiplies can be done by adds
|
// since the multiplies can be done by adds
|
mpystage = ((lgtmp-2) <= nummpy);
|
mpystage = ((lgtmp-2) <= nummpy);
|
|
|
fname = coredir + "/";
|
fname = coredir + "/";
|
if (inverse) fname += "i";
|
if (inverse) fname += "i";
|
fname += "fftstage_e";
|
fname += "fftstage_e";
|
sprintf(numstr, "%d", fftsize);
|
sprintf(numstr, "%d", fftsize);
|
fname += numstr;
|
fname += numstr;
|
fname += ".v";
|
fname += ".v";
|
build_stage(fname.c_str(), fftsize/2, 0, nbits, inverse, xtracbits, mpystage); // Even stage
|
build_stage(fname.c_str(), fftsize/2, 0, nbits, inverse, xtracbits, mpystage); // Even stage
|
|
|
fname = coredir + "/";
|
fname = coredir + "/";
|
if (inverse) fname += "i";
|
if (inverse) fname += "i";
|
fname += "fftstage_o";
|
fname += "fftstage_o";
|
sprintf(numstr, "%d", fftsize);
|
sprintf(numstr, "%d", fftsize);
|
fname += numstr;
|
fname += numstr;
|
fname += ".v";
|
fname += ".v";
|
build_stage(fname.c_str(), fftsize/2, 1, nbits, inverse, xtracbits, mpystage); // Odd stage
|
build_stage(fname.c_str(), fftsize/2, 1, nbits, inverse, xtracbits, mpystage); // Odd stage
|
}
|
}
|
|
|
nbits += 1; // New number of input bits
|
nbits += 1; // New number of input bits
|
tmp_size >>= 1; lgtmp--;
|
tmp_size >>= 1; lgtmp--;
|
dropbit = 0;
|
dropbit = 0;
|
fprintf(vmain, "\n\n");
|
fprintf(vmain, "\n\n");
|
while(tmp_size >= 8) {
|
while(tmp_size >= 8) {
|
int obits = nbits+((dropbit)?0:1);
|
int obits = nbits+((dropbit)?0:1);
|
|
|
if ((maxbitsout > 0)&&(obits > maxbitsout))
|
if ((maxbitsout > 0)&&(obits > maxbitsout))
|
obits = maxbitsout;
|
obits = maxbitsout;
|
|
|
fprintf(vmain, "\twire\t\tw_s%d, w_os%d;\n", tmp_size, tmp_size);
|
fprintf(vmain, "\twire\t\tw_s%d, w_os%d;\n", tmp_size, tmp_size);
|
fprintf(vmain, "\twire\t[%d:0]\tw_e%d, w_o%d;\n", 2*(obits+xtrapbits)-1, tmp_size, tmp_size);
|
fprintf(vmain, "\twire\t[%d:0]\tw_e%d, w_o%d;\n", 2*(obits+xtrapbits)-1, tmp_size, tmp_size);
|
fprintf(vmain, "\t%sfftstage_e%d\t#(%d,%d,%d,%d,%d,%d,%d)\tstage_e%d(i_clk, i_rst, i_ce,\n",
|
fprintf(vmain, "\t%sfftstage_e%d\t#(%d,%d,%d,%d,%d,%d,%d)\tstage_e%d(i_clk, i_rst, i_ce,\n",
|
(inverse)?"i":"", tmp_size,
|
(inverse)?"i":"", tmp_size,
|
nbits+xtrapbits, nbits+xtracbits+xtrapbits, obits+xtrapbits,
|
nbits+xtrapbits, nbits+xtracbits+xtrapbits, obits+xtrapbits,
|
lgsize, lgtmp-2, lgdelay(nbits+xtrapbits,xtracbits), (dropbit)?0:0,
|
lgsize, lgtmp-2, lgdelay(nbits+xtrapbits,xtracbits), (dropbit)?0:0,
|
tmp_size);
|
tmp_size);
|
fprintf(vmain, "\t\t\t\t\t\tw_s%d, w_e%d, w_e%d, w_s%d);\n", tmp_size<<1, tmp_size<<1, tmp_size, tmp_size);
|
fprintf(vmain, "\t\t\t\t\t\tw_s%d, w_e%d, w_e%d, w_s%d);\n", tmp_size<<1, tmp_size<<1, tmp_size, tmp_size);
|
fprintf(vmain, "\t%sfftstage_o%d\t#(%d,%d,%d,%d,%d,%d,%d)\tstage_o%d(i_clk, i_rst, i_ce,\n",
|
fprintf(vmain, "\t%sfftstage_o%d\t#(%d,%d,%d,%d,%d,%d,%d)\tstage_o%d(i_clk, i_rst, i_ce,\n",
|
(inverse)?"i":"", tmp_size,
|
(inverse)?"i":"", tmp_size,
|
nbits+xtrapbits, nbits+xtracbits+xtrapbits, obits+xtrapbits,
|
nbits+xtrapbits, nbits+xtracbits+xtrapbits, obits+xtrapbits,
|
lgsize, lgtmp-2, lgdelay(nbits+xtrapbits,xtracbits), (dropbit)?0:0,
|
lgsize, lgtmp-2, lgdelay(nbits+xtrapbits,xtracbits), (dropbit)?0:0,
|
tmp_size);
|
tmp_size);
|
fprintf(vmain, "\t\t\t\t\t\tw_s%d, w_o%d, w_o%d, w_os%d);\n", tmp_size<<1, tmp_size<<1, tmp_size, tmp_size);
|
fprintf(vmain, "\t\t\t\t\t\tw_s%d, w_o%d, w_o%d, w_os%d);\n", tmp_size<<1, tmp_size<<1, tmp_size, tmp_size);
|
fprintf(vmain, "\n\n");
|
fprintf(vmain, "\n\n");
|
|
|
{
|
{
|
std::string fname;
|
std::string fname;
|
char numstr[12];
|
char numstr[12];
|
bool mpystage;
|
bool mpystage;
|
|
|
mpystage = ((lgtmp-2) <= nummpy);
|
mpystage = ((lgtmp-2) <= nummpy);
|
|
|
fname = coredir + "/";
|
fname = coredir + "/";
|
if (inverse) fname += "i";
|
if (inverse) fname += "i";
|
fname += "fftstage_e";
|
fname += "fftstage_e";
|
sprintf(numstr, "%d", tmp_size);
|
sprintf(numstr, "%d", tmp_size);
|
fname += numstr;
|
fname += numstr;
|
fname += ".v";
|
fname += ".v";
|
build_stage(fname.c_str(), tmp_size/2, 0,
|
build_stage(fname.c_str(), tmp_size/2, 0,
|
nbits+xtrapbits, inverse, xtracbits,
|
nbits+xtrapbits, inverse, xtracbits,
|
mpystage); // Even stage
|
mpystage); // Even stage
|
|
|
fname = coredir + "/";
|
fname = coredir + "/";
|
if (inverse) fname += "i";
|
if (inverse) fname += "i";
|
fname += "fftstage_o";
|
fname += "fftstage_o";
|
sprintf(numstr, "%d", tmp_size);
|
sprintf(numstr, "%d", tmp_size);
|
fname += numstr;
|
fname += numstr;
|
fname += ".v";
|
fname += ".v";
|
build_stage(fname.c_str(), tmp_size/2, 1,
|
build_stage(fname.c_str(), tmp_size/2, 1,
|
nbits+xtrapbits, inverse, xtracbits,
|
nbits+xtrapbits, inverse, xtracbits,
|
mpystage); // Odd stage
|
mpystage); // Odd stage
|
}
|
}
|
|
|
|
|
dropbit ^= 1;
|
dropbit ^= 1;
|
nbits = obits;
|
nbits = obits;
|
tmp_size >>= 1; lgtmp--;
|
tmp_size >>= 1; lgtmp--;
|
}
|
}
|
|
|
if (tmp_size == 4) {
|
if (tmp_size == 4) {
|
int obits = nbits+((dropbit)?0:1);
|
int obits = nbits+((dropbit)?0:1);
|
|
|
if ((maxbitsout > 0)&&(obits > maxbitsout))
|
if ((maxbitsout > 0)&&(obits > maxbitsout))
|
obits = maxbitsout;
|
obits = maxbitsout;
|
|
|
fprintf(vmain, "\twire\t\tw_s4, w_os4;\n");
|
fprintf(vmain, "\twire\t\tw_s4, w_os4;\n");
|
fprintf(vmain, "\twire\t[%d:0]\tw_e4, w_o4;\n", 2*(obits+xtrapbits)-1);
|
fprintf(vmain, "\twire\t[%d:0]\tw_e4, w_o4;\n", 2*(obits+xtrapbits)-1);
|
fprintf(vmain, "\tqtrstage\t#(%d,%d,%d,0,%d,%d)\tstage_e4(i_clk, i_rst, i_ce,\n",
|
fprintf(vmain, "\tqtrstage\t#(%d,%d,%d,0,%d,%d)\tstage_e4(i_clk, i_rst, i_ce,\n",
|
nbits+xtrapbits, obits+xtrapbits, lgsize, (inverse)?1:0, (dropbit)?0:0);
|
nbits+xtrapbits, obits+xtrapbits, lgsize, (inverse)?1:0, (dropbit)?0:0);
|
fprintf(vmain, "\t\t\t\t\t\tw_s8, w_e8, w_e4, w_s4);\n");
|
fprintf(vmain, "\t\t\t\t\t\tw_s8, w_e8, w_e4, w_s4);\n");
|
fprintf(vmain, "\tqtrstage\t#(%d,%d,%d,1,%d,%d)\tstage_o4(i_clk, i_rst, i_ce,\n",
|
fprintf(vmain, "\tqtrstage\t#(%d,%d,%d,1,%d,%d)\tstage_o4(i_clk, i_rst, i_ce,\n",
|
nbits+xtrapbits, obits+xtrapbits, lgsize, (inverse)?1:0, (dropbit)?0:0);
|
nbits+xtrapbits, obits+xtrapbits, lgsize, (inverse)?1:0, (dropbit)?0:0);
|
fprintf(vmain, "\t\t\t\t\t\tw_s8, w_o8, w_o4, w_os4);\n");
|
fprintf(vmain, "\t\t\t\t\t\tw_s8, w_o8, w_o4, w_os4);\n");
|
dropbit ^= 1;
|
dropbit ^= 1;
|
nbits = obits;
|
nbits = obits;
|
tmp_size >>= 1; lgtmp--;
|
tmp_size >>= 1; lgtmp--;
|
}
|
}
|
|
|
{
|
{
|
int obits = nbits+((dropbit)?0:1);
|
int obits = nbits+((dropbit)?0:1);
|
if (obits > nbitsout)
|
if (obits > nbitsout)
|
obits = nbitsout;
|
obits = nbitsout;
|
if ((maxbitsout>0)&&(obits > maxbitsout))
|
if ((maxbitsout>0)&&(obits > maxbitsout))
|
obits = maxbitsout;
|
obits = maxbitsout;
|
fprintf(vmain, "\twire\t\tw_s2;\n");
|
fprintf(vmain, "\twire\t\tw_s2;\n");
|
fprintf(vmain, "\twire\t[%d:0]\tw_e2, w_o2;\n", 2*obits-1);
|
fprintf(vmain, "\twire\t[%d:0]\tw_e2, w_o2;\n", 2*obits-1);
|
fprintf(vmain, "\tdblstage\t#(%d,%d,%d)\tstage_2(i_clk, i_rst, i_ce,\n", nbits+xtrapbits, obits,(dropbit)?0:1);
|
fprintf(vmain, "\tdblstage\t#(%d,%d,%d)\tstage_2(i_clk, i_rst, i_ce,\n", nbits+xtrapbits, obits,(dropbit)?0:1);
|
fprintf(vmain, "\t\t\t\t\tw_s4, w_e4, w_o4, w_e2, w_o2, w_s2);\n");
|
fprintf(vmain, "\t\t\t\t\tw_s4, w_e4, w_o4, w_e2, w_o2, w_s2);\n");
|
|
|
fprintf(vmain, "\n\n");
|
fprintf(vmain, "\n\n");
|
nbits = obits;
|
nbits = obits;
|
}
|
}
|
|
|
fprintf(vmain, "\t// Prepare for a (potential) bit-reverse stage.\n");
|
fprintf(vmain, "\t// Prepare for a (potential) bit-reverse stage.\n");
|
fprintf(vmain, "\tassign\tbr_left = w_e2;\n");
|
fprintf(vmain, "\tassign\tbr_left = w_e2;\n");
|
fprintf(vmain, "\tassign\tbr_right = w_o2;\n");
|
fprintf(vmain, "\tassign\tbr_right = w_o2;\n");
|
fprintf(vmain, "\n");
|
fprintf(vmain, "\n");
|
if (bitreverse) {
|
if (bitreverse) {
|
fprintf(vmain, "\twire\tbr_start;\n");
|
fprintf(vmain, "\twire\tbr_start;\n");
|
fprintf(vmain, "\treg\tr_br_started;\n");
|
fprintf(vmain, "\treg\tr_br_started;\n");
|
fprintf(vmain, "\talways @(posedge i_clk)\n");
|
fprintf(vmain, "\talways @(posedge i_clk)\n");
|
fprintf(vmain, "\t\tif (i_rst)\n");
|
fprintf(vmain, "\t\tif (i_rst)\n");
|
fprintf(vmain, "\t\t\tr_br_started <= 1'b0;\n");
|
fprintf(vmain, "\t\t\tr_br_started <= 1'b0;\n");
|
fprintf(vmain, "\t\telse\n");
|
fprintf(vmain, "\t\telse\n");
|
fprintf(vmain, "\t\t\tr_br_started <= r_br_started || w_s2;\n");
|
fprintf(vmain, "\t\t\tr_br_started <= r_br_started || w_s2;\n");
|
fprintf(vmain, "\tassign\tbr_start = r_br_started || w_s2;\n");
|
fprintf(vmain, "\tassign\tbr_start = r_br_started || w_s2;\n");
|
}
|
}
|
}
|
}
|
|
|
fprintf(vmain, "\n");
|
fprintf(vmain, "\n");
|
fprintf(vmain, "\t// Now for the bit-reversal stage.\n");
|
fprintf(vmain, "\t// Now for the bit-reversal stage.\n");
|
fprintf(vmain, "\twire\tbr_sync;\n");
|
fprintf(vmain, "\twire\tbr_sync;\n");
|
fprintf(vmain, "\twire\t[(2*OWIDTH-1):0]\tbr_o_left, br_o_right;\n");
|
fprintf(vmain, "\twire\t[(2*OWIDTH-1):0]\tbr_o_left, br_o_right;\n");
|
if (bitreverse) {
|
if (bitreverse) {
|
fprintf(vmain, "\tdblreverse\t#(%d,%d)\trevstage(i_clk, i_rst,\n", lgsize, nbitsout);
|
fprintf(vmain, "\tdblreverse\t#(%d,%d)\trevstage(i_clk, i_rst,\n", lgsize, nbitsout);
|
fprintf(vmain, "\t\t\t(i_ce & br_start), br_left, br_right,\n");
|
fprintf(vmain, "\t\t\t(i_ce & br_start), br_left, br_right,\n");
|
fprintf(vmain, "\t\t\tbr_o_left, br_o_right, br_sync);\n");
|
fprintf(vmain, "\t\t\tbr_o_left, br_o_right, br_sync);\n");
|
} else {
|
} else {
|
fprintf(vmain, "\tassign\tbr_o_left = br_left;\n");
|
fprintf(vmain, "\tassign\tbr_o_left = br_left;\n");
|
fprintf(vmain, "\tassign\tbr_o_right = br_right;\n");
|
fprintf(vmain, "\tassign\tbr_o_right = br_right;\n");
|
fprintf(vmain, "\tassign\tbr_sync = w_s2;\n");
|
fprintf(vmain, "\tassign\tbr_sync = w_s2;\n");
|
}
|
}
|
|
|
fprintf(vmain, "\n\n");
|
fprintf(vmain, "\n\n");
|
fprintf(vmain, "\t// Last clock: Register our outputs, we\'re done.\n");
|
fprintf(vmain, "\t// Last clock: Register our outputs, we\'re done.\n");
|
fprintf(vmain, "\talways @(posedge i_clk)\n");
|
fprintf(vmain, "\talways @(posedge i_clk)\n");
|
fprintf(vmain, "\t\tbegin\n");
|
fprintf(vmain, "\t\tbegin\n");
|
fprintf(vmain, "\t\t\to_left <= br_o_left;\n");
|
fprintf(vmain, "\t\t\to_left <= br_o_left;\n");
|
fprintf(vmain, "\t\t\to_right <= br_o_right;\n");
|
fprintf(vmain, "\t\t\to_right <= br_o_right;\n");
|
fprintf(vmain, "\t\t\to_sync <= br_sync;\n");
|
fprintf(vmain, "\t\t\to_sync <= br_sync;\n");
|
fprintf(vmain, "\t\tend\n");
|
fprintf(vmain, "\t\tend\n");
|
fprintf(vmain, "\n\n");
|
fprintf(vmain, "\n\n");
|
fprintf(vmain, "endmodule\n");
|
fprintf(vmain, "endmodule\n");
|
fclose(vmain);
|
fclose(vmain);
|
|
|
{
|
{
|
std::string fname;
|
std::string fname;
|
|
|
fname = coredir + "/butterfly.v";
|
fname = coredir + "/butterfly.v";
|
build_butterfly(fname.c_str(), xtracbits, rounding);
|
build_butterfly(fname.c_str(), xtracbits, rounding);
|
|
|
if (nummpy > 0) {
|
if (nummpy > 0) {
|
fname = coredir + "/hwbfly.v";
|
fname = coredir + "/hwbfly.v";
|
build_hwbfly(fname.c_str(), xtracbits, rounding);
|
build_hwbfly(fname.c_str(), xtracbits, rounding);
|
}
|
}
|
|
|
fname = coredir + "/shiftaddmpy.v";
|
fname = coredir + "/shiftaddmpy.v";
|
build_multiply(fname.c_str());
|
build_multiply(fname.c_str());
|
|
|
fname = coredir + "/qtrstage.v";
|
fname = coredir + "/qtrstage.v";
|
build_quarters(fname.c_str(), rounding);
|
build_quarters(fname.c_str(), rounding);
|
|
|
fname = coredir + "/dblstage.v";
|
fname = coredir + "/dblstage.v";
|
build_dblstage(fname.c_str(), rounding);
|
build_dblstage(fname.c_str(), rounding);
|
|
|
if (bitreverse) {
|
if (bitreverse) {
|
fname = coredir + "/dblreverse.v";
|
fname = coredir + "/dblreverse.v";
|
build_dblreverse(fname.c_str());
|
build_dblreverse(fname.c_str());
|
}
|
}
|
|
|
const char *rnd_string = "";
|
const char *rnd_string = "";
|
switch(rounding) {
|
switch(rounding) {
|
case RND_TRUNCATE: rnd_string = "/truncate.v"; break;
|
case RND_TRUNCATE: rnd_string = "/truncate.v"; break;
|
case RND_FROMZERO: rnd_string = "/roundfromzero.v"; break;
|
case RND_FROMZERO: rnd_string = "/roundfromzero.v"; break;
|
case RND_HALFUP: rnd_string = "/roundhalfup.v"; break;
|
case RND_HALFUP: rnd_string = "/roundhalfup.v"; break;
|
default:
|
default:
|
rnd_string = "/convround.v"; break;
|
rnd_string = "/convround.v"; break;
|
} fname = coredir + rnd_string;
|
} fname = coredir + rnd_string;
|
switch(rounding) {
|
switch(rounding) {
|
case RND_TRUNCATE: build_truncator(fname.c_str()); break;
|
case RND_TRUNCATE: build_truncator(fname.c_str()); break;
|
case RND_FROMZERO: build_roundfromzero(fname.c_str()); break;
|
case RND_FROMZERO: build_roundfromzero(fname.c_str()); break;
|
case RND_HALFUP: build_roundhalfup(fname.c_str()); break;
|
case RND_HALFUP: build_roundhalfup(fname.c_str()); break;
|
default:
|
default:
|
build_convround(fname.c_str()); break;
|
build_convround(fname.c_str()); break;
|
}
|
}
|
|
|
}
|
}
|
}
|
}
|
|
|
|
|
|
|
