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// default SYN_KEEP definition
    // ACTEL FPGA should not use logic to handle rw collision
///////////////////////////////////////
// dependencies
///////////////////////////////////////
// size to width
//////////////////////////////////////////////////////////////////////
////                                                              ////
////  Versatile library, clock and reset                          ////
////                                                              ////
////  Description                                                 ////
////  Logic related to clock and reset                            ////
////                                                              ////
////                                                              ////
////  To Do:                                                      ////
////   - add more different registers                             ////
////                                                              ////
////  Author(s):                                                  ////
////      - Michael Unneback, unneback@opencores.org              ////
////        ORSoC AB                                              ////
////                                                              ////
//////////////////////////////////////////////////////////////////////
////                                                              ////
//// Copyright (C) 2010 Authors and OPENCORES.ORG                 ////
////                                                              ////
//// This source file may be used and distributed without         ////
//// restriction provided that this copyright statement is not    ////
//// removed from the file and that any derivative work contains  ////
//// the original copyright notice and the associated disclaimer. ////
////                                                              ////
//// This source file is free software; you can redistribute it   ////
//// and/or modify it under the terms of the GNU Lesser General   ////
//// Public License as published by the Free Software Foundation; ////
//// either version 2.1 of the License, or (at your option) any   ////
//// later version.                                               ////
////                                                              ////
//// This source is distributed in the hope that it will be       ////
//// useful, but WITHOUT ANY WARRANTY; without even the implied   ////
//// warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR      ////
//// PURPOSE.  See the GNU Lesser General Public License for more ////
//// details.                                                     ////
////                                                              ////
//// You should have received a copy of the GNU Lesser General    ////
//// Public License along with this source; if not, download it   ////
//// from http://www.opencores.org/lgpl.shtml                     ////
////                                                              ////
//////////////////////////////////////////////////////////////////////
`timescale 1 ns/100 ps
// Global buffer
// usage:
// use to enable global buffers for high fan out signals such as clock and reset
// Version: 8.4 8.4.0.33
module gbuf(GL,CLK);
output GL;
input  CLK;
    wire GND;
    GND GND_1_net(.Y(GND));
    CLKDLY Inst1(.CLK(CLK), .GL(GL), .DLYGL0(GND), .DLYGL1(GND),
        .DLYGL2(GND), .DLYGL3(GND), .DLYGL4(GND)) /* synthesis black_box */;
endmodule
`timescale 1 ns/1 ns
module vl_gbuf ( i, o);
input i;
output o;
`ifdef SIM_GBUF
assign o=i;
`else
gbuf gbuf_i0 ( .CLK(i), .GL(o));
`endif
endmodule
 //ACTEL
// sync reset
// input active lo async reset, normally from external reset generator and/or switch
// output active high global reset sync with two DFFs 
`timescale 1 ns/100 ps
module vl_sync_rst ( rst_n_i, rst_o, clk);
input rst_n_i, clk;
output rst_o;
reg [1:0] tmp;
always @ (posedge clk or negedge rst_n_i)
if (!rst_n_i)
        tmp <= 2'b11;
else
        tmp <= {1'b0,tmp[1]};
vl_gbuf buf_i0( .i(tmp[0]), .o(rst_o));
endmodule
// vl_pll
///////////////////////////////////////////////////////////////////////////////
`timescale 1 ps/1 ps
module vl_pll ( clk_i, rst_n_i, lock, clk_o, rst_o);
parameter index = 0;
parameter number_of_clk = 1;
parameter period_time_0 = 20000;
parameter period_time_1 = 20000;
parameter period_time_2 = 20000;
parameter lock_delay = 2000000;
input clk_i, rst_n_i;
output lock;
output reg [0:number_of_clk-1] clk_o;
output [0:number_of_clk-1] rst_o;
`ifdef SIM_PLL
always
     #((period_time_0)/2) clk_o[0] <=  (!rst_n_i) ? 0 : ~clk_o[0];
generate if (number_of_clk > 1)
always
     #((period_time_1)/2) clk_o[1] <=  (!rst_n_i) ? 0 : ~clk_o[1];
endgenerate
generate if (number_of_clk > 2)
always
     #((period_time_2)/2) clk_o[2] <=  (!rst_n_i) ? 0 : ~clk_o[2];
endgenerate
genvar i;
generate for (i=0;i<number_of_clk;i=i+1) begin: clock
     vl_sync_rst rst_i0 ( .rst_n_i(rst_n_i | lock), .rst_o(rst_o[i]), .clk(clk_o[i]));
end
endgenerate
assign #lock_delay lock = rst_n_i;
endmodule
`else
generate if (number_of_clk==1 & index==0) begin
        pll0 pll_i0 (.POWERDOWN(1'b1), .CLKA(clk_i), .LOCK(lock), .GLA(clk_o[0]));
end
endgenerate // index==0
generate if (number_of_clk==1 & index==1) begin
        pll1 pll_i0 (.POWERDOWN(1'b1), .CLKA(clk_i), .LOCK(lock), .GLA(clk_o[0]));
end
endgenerate // index==1
generate if (number_of_clk==1 & index==2) begin
        pll2 pll_i0 (.POWERDOWN(1'b1), .CLKA(clk_i), .LOCK(lock), .GLA(clk_o[0]));
end
endgenerate // index==2
generate if (number_of_clk==1 & index==3) begin
        pll3 pll_i0 (.POWERDOWN(1'b1), .CLKA(clk_i), .LOCK(lock), .GLA(clk_o[0]));
end
endgenerate // index==0
generate if (number_of_clk==2 & index==0) begin
        pll0 pll_i0 (.POWERDOWN(1'b1), .CLKA(clk_i), .LOCK(lock), .GLA(clk_o[0]), .GLB(clk_o[1]));
end
endgenerate // index==0
generate if (number_of_clk==2 & index==1) begin
        pll1 pll_i0 (.POWERDOWN(1'b1), .CLKA(clk_i), .LOCK(lock), .GLA(clk_o[0]), .GLB(clk_o[1]));
end
endgenerate // index==1
generate if (number_of_clk==2 & index==2) begin
        pll2 pll_i0 (.POWERDOWN(1'b1), .CLKA(clk_i), .LOCK(lock), .GLA(clk_o[0]), .GLB(clk_o[1]));
end
endgenerate // index==2
generate if (number_of_clk==2 & index==3) begin
        pll3 pll_i0 (.POWERDOWN(1'b1), .CLKA(clk_i), .LOCK(lock), .GLA(clk_o[0]), .GLB(clk_o[1]));
end
endgenerate // index==0
generate if (number_of_clk==3 & index==0) begin
        pll0 pll_i0 (.POWERDOWN(1'b1), .CLKA(clk_i), .LOCK(lock), .GLA(clk_o[0]), .GLB(clk_o[1]), .GLC(clk_o[2]));
end
endgenerate // index==0
generate if (number_of_clk==3 & index==1) begin
        pll1 pll_i0 (.POWERDOWN(1'b1), .CLKA(clk_i), .LOCK(lock), .GLA(clk_o[0]), .GLB(clk_o[1]), .GLC(clk_o[2]));
end
endgenerate // index==1
generate if (number_of_clk==3 & index==2) begin
        pll2 pll_i0 (.POWERDOWN(1'b1), .CLKA(clk_i), .LOCK(lock), .GLA(clk_o[0]), .GLB(clk_o[1]), .GLC(clk_o[2]));
end
endgenerate // index==2
generate if (number_of_clk==3 & index==3) begin
        pll3 pll_i0 (.POWERDOWN(1'b1), .CLKA(clk_i), .LOCK(lock), .GLA(clk_o[0]), .GLB(clk_o[1]), .GLC(clk_o[2]));
end
endgenerate // index==0
genvar i;
generate for (i=0;i<number_of_clk;i=i+1) begin: clock
        vl_sync_rst rst_i0 ( .rst_n_i(rst_n_i | lock), .rst_o(rst_o), .clk(clk_o[i]));
end
endgenerate
endmodule
`endif
///////////////////////////////////////////////////////////////////////////////
 //actel
//////////////////////////////////////////////////////////////////////
////                                                              ////
////  Versatile library, registers                                ////
////                                                              ////
////  Description                                                 ////
////  Different type of registers                                 ////
////                                                              ////
////                                                              ////
////  To Do:                                                      ////
////   - add more different registers                             ////
////                                                              ////
////  Author(s):                                                  ////
////      - Michael Unneback, unneback@opencores.org              ////
////        ORSoC AB                                              ////
////                                                              ////
//////////////////////////////////////////////////////////////////////
////                                                              ////
//// Copyright (C) 2010 Authors and OPENCORES.ORG                 ////
////                                                              ////
//// This source file may be used and distributed without         ////
//// restriction provided that this copyright statement is not    ////
//// removed from the file and that any derivative work contains  ////
//// the original copyright notice and the associated disclaimer. ////
////                                                              ////
//// This source file is free software; you can redistribute it   ////
//// and/or modify it under the terms of the GNU Lesser General   ////
//// Public License as published by the Free Software Foundation; ////
//// either version 2.1 of the License, or (at your option) any   ////
//// later version.                                               ////
////                                                              ////
//// This source is distributed in the hope that it will be       ////
//// useful, but WITHOUT ANY WARRANTY; without even the implied   ////
//// warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR      ////
//// PURPOSE.  See the GNU Lesser General Public License for more ////
//// details.                                                     ////
////                                                              ////
//// You should have received a copy of the GNU Lesser General    ////
//// Public License along with this source; if not, download it   ////
//// from http://www.opencores.org/lgpl.shtml                     ////
////                                                              ////
//////////////////////////////////////////////////////////////////////
module vl_dff ( d, q, clk, rst);
        parameter width = 1;
        parameter reset_value = 0;
        input [width-1:0] d;
        input clk, rst;
        output reg [width-1:0] q;
        always @ (posedge clk or posedge rst)
        if (rst)
                q <= reset_value;
        else
                q <= d;
endmodule
module vl_dff_array ( d, q, clk, rst);
        parameter width = 1;
        parameter depth = 2;
        parameter reset_value = 1'b0;
        input [width-1:0] d;
        input clk, rst;
        output [width-1:0] q;
        reg  [0:depth-1] q_tmp [width-1:0];
        integer i;
        always @ (posedge clk or posedge rst)
        if (rst) begin
            for (i=0;i<depth;i=i+1)
                q_tmp[i] <= {width{reset_value}};
        end else begin
            q_tmp[0] <= d;
            for (i=1;i<depth;i=i+1)
                q_tmp[i] <= q_tmp[i-1];
        end
    assign q = q_tmp[depth-1];
endmodule
module vl_dff_ce ( d, ce, q, clk, rst);
        parameter width = 1;
        parameter reset_value = 0;
        input [width-1:0] d;
        input ce, clk, rst;
        output reg [width-1:0] q;
        always @ (posedge clk or posedge rst)
        if (rst)
                q <= reset_value;
        else
                if (ce)
                        q <= d;
endmodule
module vl_dff_ce_clear ( d, ce, clear, q, clk, rst);
        parameter width = 1;
        parameter reset_value = 0;
        input [width-1:0] d;
        input ce, clear, clk, rst;
        output reg [width-1:0] q;
        always @ (posedge clk or posedge rst)
        if (rst)
            q <= reset_value;
        else
            if (ce)
                if (clear)
                    q <= {width{1'b0}};
                else
                    q <= d;
endmodule
module vl_dff_ce_set ( d, ce, set, q, clk, rst);
        parameter width = 1;
        parameter reset_value = 0;
        input [width-1:0] d;
        input ce, set, clk, rst;
        output reg [width-1:0] q;
        always @ (posedge clk or posedge rst)
        if (rst)
            q <= reset_value;
        else
            if (ce)
                if (set)
                    q <= {width{1'b1}};
                else
                    q <= d;
endmodule
module vl_spr ( sp, r, q, clk, rst);
        //parameter width = 1;
        parameter reset_value = 1'b0;
        input sp, r;
        output reg q;
        input clk, rst;
        always @ (posedge clk or posedge rst)
        if (rst)
            q <= reset_value;
        else
            if (sp)
                q <= 1'b1;
            else if (r)
                q <= 1'b0;
endmodule
module vl_srp ( s, rp, q, clk, rst);
        parameter width = 1;
        parameter reset_value = 0;
        input s, rp;
        output reg q;
        input clk, rst;
        always @ (posedge clk or posedge rst)
        if (rst)
            q <= reset_value;
        else
            if (rp)
                q <= 1'b0;
            else if (s)
                q <= 1'b1;
endmodule
module vl_dff_sr ( aclr, aset, clock, data, q);
    input         aclr;
    input         aset;
    input         clock;
    input         data;
    output reg    q;
   always @ (posedge clock or posedge aclr or posedge aset)
     if (aclr)
       q <= 1'b0;
     else if (aset)
       q <= 1'b1;
     else
       q <= data;
endmodule
// LATCH
// For targtes not supporting LATCH use dff_sr with clk=1 and data=1
module vl_latch ( d, le, q, clk);
input d, le;
input clk;
always @ (le or d)
if (le)
    d <= q;
endmodule
module vl_shreg ( d, q, clk, rst);
parameter depth = 10;
input d;
output q;
input clk, rst;
reg [1:depth] dffs;
always @ (posedge clk or posedge rst)
if (rst)
    dffs <= {depth{1'b0}};
else
    dffs <= {d,dffs[1:depth-1]};
assign q = dffs[depth];
endmodule
module vl_shreg_ce ( d, ce, q, clk, rst);
parameter depth = 10;
input d, ce;
output q;
input clk, rst;
reg [1:depth] dffs;
always @ (posedge clk or posedge rst)
if (rst)
    dffs <= {depth{1'b0}};
else
    if (ce)
        dffs <= {d,dffs[1:depth-1]};
assign q = dffs[depth];
endmodule
module vl_delay ( d, q, clk, rst);
parameter depth = 10;
input d;
output q;
input clk, rst;
reg [1:depth] dffs;
always @ (posedge clk or posedge rst)
if (rst)
    dffs <= {depth{1'b0}};
else
    dffs <= {d,dffs[1:depth-1]};
assign q = dffs[depth];
endmodule
module vl_delay_emptyflag ( d, q, emptyflag, clk, rst);
parameter depth = 10;
input d;
output q, emptyflag;
input clk, rst;
reg [1:depth] dffs;
always @ (posedge clk or posedge rst)
if (rst)
    dffs <= {depth{1'b0}};
else
    dffs <= {d,dffs[1:depth-1]};
assign q = dffs[depth];
assign emptyflag = !(|dffs);
endmodule
module vl_pulse2toggle ( pl, q, clk, rst);
input pl;
output reg q;
input clk, rst;
always @ (posedge clk or posedge rst)
if (rst)
    q <= 1'b0;
else
    q <= pl ^ q;
endmodule
module vl_toggle2pulse (d, pl, clk, rst);
input d;
output pl;
input clk, rst;
reg dff;
always @ (posedge clk or posedge rst)
if (rst)
    dff <= 1'b0;
else
    dff <= d;
assign pl = d ^ dff;
endmodule
module vl_synchronizer (d, q, clk, rst);
input d;
output reg q;
input clk, rst;
reg dff;
always @ (posedge clk or posedge rst)
if (rst)
    {q,dff} <= 2'b00;
else
    {q,dff} <= {dff,d};
endmodule
module vl_cdc ( start_pl, take_it_pl, take_it_grant_pl, got_it_pl, clk_src, rst_src, clk_dst, rst_dst);
input start_pl;
output take_it_pl;
input take_it_grant_pl; // note: connect to take_it_pl to generate automatic ack
output got_it_pl;
input clk_src, rst_src;
input clk_dst, rst_dst;
wire take_it_tg, take_it_tg_sync;
wire got_it_tg, got_it_tg_sync;
// src -> dst
vl_pulse2toggle p2t0 (
    .pl(start_pl),
    .q(take_it_tg),
    .clk(clk_src),
    .rst(rst_src));
vl_synchronizer sync0 (
    .d(take_it_tg),
    .q(take_it_tg_sync),
    .clk(clk_dst),
    .rst(rst_dst));
vl_toggle2pulse t2p0 (
    .d(take_it_tg_sync),
    .pl(take_it_pl),
    .clk(clk_dst),
    .rst(rst_dst));
// dst -> src
vl_pulse2toggle p2t1 (
    .pl(take_it_grant_pl),
    .q(got_it_tg),
    .clk(clk_dst),
    .rst(rst_dst));
vl_synchronizer sync1 (
    .d(got_it_tg),
    .q(got_it_tg_sync),
    .clk(clk_src),
    .rst(rst_src));
vl_toggle2pulse t2p1 (
    .d(got_it_tg_sync),
    .pl(got_it_pl),
    .clk(clk_src),
    .rst(rst_src));
endmodule
//////////////////////////////////////////////////////////////////////
////                                                              ////
////  Logic functions                                             ////
////                                                              ////
////  Description                                                 ////
////  Logic functions such as multiplexers                        ////
////                                                              ////
////                                                              ////
////  To Do:                                                      ////
////   -                                                          ////
////                                                              ////
////  Author(s):                                                  ////
////      - Michael Unneback, unneback@opencores.org              ////
////        ORSoC AB                                              ////
////                                                              ////
//////////////////////////////////////////////////////////////////////
////                                                              ////
//// Copyright (C) 2010 Authors and OPENCORES.ORG                 ////
////                                                              ////
//// This source file may be used and distributed without         ////
//// restriction provided that this copyright statement is not    ////
//// removed from the file and that any derivative work contains  ////
//// the original copyright notice and the associated disclaimer. ////
////                                                              ////
//// This source file is free software; you can redistribute it   ////
//// and/or modify it under the terms of the GNU Lesser General   ////
//// Public License as published by the Free Software Foundation; ////
//// either version 2.1 of the License, or (at your option) any   ////
//// later version.                                               ////
////                                                              ////
//// This source is distributed in the hope that it will be       ////
//// useful, but WITHOUT ANY WARRANTY; without even the implied   ////
//// warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR      ////
//// PURPOSE.  See the GNU Lesser General Public License for more ////
//// details.                                                     ////
////                                                              ////
//// You should have received a copy of the GNU Lesser General    ////
//// Public License along with this source; if not, download it   ////
//// from http://www.opencores.org/lgpl.shtml                     ////
////                                                              ////
//////////////////////////////////////////////////////////////////////
module vl_mux_andor ( a, sel, dout);
parameter width = 32;
parameter nr_of_ports = 4;
input [nr_of_ports*width-1:0] a;
input [nr_of_ports-1:0] sel;
output reg [width-1:0] dout;
integer i,j;
always @ (a, sel)
begin
    dout = a[width-1:0] & {width{sel[0]}};
    for (i=1;i<nr_of_ports;i=i+1)
        for (j=0;j<width;j=j+1)
            dout[j] = (a[i*width + j] & sel[i]) | dout[j];
end
endmodule
module vl_mux2_andor ( a1, a0, sel, dout);
parameter width = 32;
localparam nr_of_ports = 2;
input [width-1:0] a1, a0;
input [nr_of_ports-1:0] sel;
output [width-1:0] dout;
vl_mux_andor
    # ( .width(width), .nr_of_ports(nr_of_ports))
    mux0( .a({a1,a0}), .sel(sel), .dout(dout));
endmodule
module vl_mux3_andor ( a2, a1, a0, sel, dout);
parameter width = 32;
localparam nr_of_ports = 3;
input [width-1:0] a2, a1, a0;
input [nr_of_ports-1:0] sel;
output [width-1:0] dout;
vl_mux_andor
    # ( .width(width), .nr_of_ports(nr_of_ports))
    mux0( .a({a2,a1,a0}), .sel(sel), .dout(dout));
endmodule
module vl_mux4_andor ( a3, a2, a1, a0, sel, dout);
parameter width = 32;
localparam nr_of_ports = 4;
input [width-1:0] a3, a2, a1, a0;
input [nr_of_ports-1:0] sel;
output [width-1:0] dout;
vl_mux_andor
    # ( .width(width), .nr_of_ports(nr_of_ports))
    mux0( .a({a3,a2,a1,a0}), .sel(sel), .dout(dout));
endmodule
module vl_mux5_andor ( a4, a3, a2, a1, a0, sel, dout);
parameter width = 32;
localparam nr_of_ports = 5;
input [width-1:0] a4, a3, a2, a1, a0;
input [nr_of_ports-1:0] sel;
output [width-1:0] dout;
vl_mux_andor
    # ( .width(width), .nr_of_ports(nr_of_ports))
    mux0( .a({a4,a3,a2,a1,a0}), .sel(sel), .dout(dout));
endmodule
module vl_mux6_andor ( a5, a4, a3, a2, a1, a0, sel, dout);
parameter width = 32;
localparam nr_of_ports = 6;
input [width-1:0] a5, a4, a3, a2, a1, a0;
input [nr_of_ports-1:0] sel;
output [width-1:0] dout;
vl_mux_andor
    # ( .width(width), .nr_of_ports(nr_of_ports))
    mux0( .a({a5,a4,a3,a2,a1,a0}), .sel(sel), .dout(dout));
endmodule
module vl_parity_generate (data, parity);
parameter word_size = 32;
parameter chunk_size = 8;
parameter parity_type = 1'b0; // 0 - even, 1 - odd parity
input [word_size-1:0] data;
output reg [word_size/chunk_size-1:0] parity;
integer i,j;
always @ (data)
for (i=0;i<word_size/chunk_size;i=i+1) begin
    parity[i] = parity_type;
    for (j=0;j<chunk_size;j=j+1) begin
        parity[i] = data[i*chunk_size+j] ^ parity[i];
    end
end
endmodule
module vl_parity_check( data, parity, parity_error);
parameter word_size = 32;
parameter chunk_size = 8;
parameter parity_type = 1'b0; // 0 - even, 1 - odd parity
input [word_size-1:0] data;
input [word_size/chunk_size-1:0] parity;
output parity_error;
reg [word_size/chunk_size-1:0] error_flag;
integer i,j;
always @ (data or parity)
for (i=0;i<word_size/chunk_size;i=i+1) begin
    error_flag[i] = parity[i] ^ parity_type;
    for (j=0;j<chunk_size;j=j+1) begin
        error_flag[i] = data[i*chunk_size+j] ^ error_flag[i];
    end
end
assign parity_error = |error_flag;
endmodule
//////////////////////////////////////////////////////////////////////
////                                                              ////
////  IO functions                                                ////
////                                                              ////
////  Description                                                 ////
////  IO functions such as IOB flip-flops                         ////
////                                                              ////
////                                                              ////
////  To Do:                                                      ////
////   -                                                          ////
////                                                              ////
////  Author(s):                                                  ////
////      - Michael Unneback, unneback@opencores.org              ////
////        ORSoC AB                                              ////
////                                                              ////
//////////////////////////////////////////////////////////////////////
////                                                              ////
//// Copyright (C) 2010 Authors and OPENCORES.ORG                 ////
////                                                              ////
//// This source file may be used and distributed without         ////
//// restriction provided that this copyright statement is not    ////
//// removed from the file and that any derivative work contains  ////
//// the original copyright notice and the associated disclaimer. ////
////                                                              ////
//// This source file is free software; you can redistribute it   ////
//// and/or modify it under the terms of the GNU Lesser General   ////
//// Public License as published by the Free Software Foundation; ////
//// either version 2.1 of the License, or (at your option) any   ////
//// later version.                                               ////
////                                                              ////
//// This source is distributed in the hope that it will be       ////
//// useful, but WITHOUT ANY WARRANTY; without even the implied   ////
//// warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR      ////
//// PURPOSE.  See the GNU Lesser General Public License for more ////
//// details.                                                     ////
////                                                              ////
//// You should have received a copy of the GNU Lesser General    ////
//// Public License along with this source; if not, download it   ////
//// from http://www.opencores.org/lgpl.shtml                     ////
////                                                              ////
//////////////////////////////////////////////////////////////////////
`timescale 1ns/1ns
module vl_o_dff (d_i, o_pad, clk, rst);
parameter width = 1;
parameter reset_value = {width{1'b0}};
input  [width-1:0]  d_i;
output [width-1:0] o_pad;
input clk, rst;
wire [width-1:0] d_i_int /*synthesis syn_keep = 1*/;
reg  [width-1:0] o_pad_int;
assign d_i_int = d_i;
genvar i;
generate
for (i=0;i<width;i=i+1) begin : dffs
    always @ (posedge clk or posedge rst)
    if (rst)
        o_pad_int[i] <= reset_value[i];
    else
        o_pad_int[i] <= d_i_int[i];
    assign #1 o_pad[i] = o_pad_int[i];
end
endgenerate
endmodule
`timescale 1ns/1ns
module vl_io_dff_oe ( d_i, d_o, oe, io_pad, clk, rst);
parameter width = 1;
input  [width-1:0] d_o;
output reg [width-1:0] d_i;
input oe;
inout [width-1:0] io_pad;
input clk, rst;
wire [width-1:0] oe_d /*synthesis syn_keep = 1*/;
reg [width-1:0] oe_q;
reg [width-1:0] d_o_q;
assign oe_d = {width{oe}};
genvar i;
generate
for (i=0;i<width;i=i+1) begin : dffs
    always @ (posedge clk or posedge rst)
    if (rst)
        oe_q[i] <= 1'b0;
    else
        oe_q[i] <= oe_d[i];
    always @ (posedge clk or posedge rst)
    if (rst)
        d_o_q[i] <= 1'b0;
    else
        d_o_q[i] <= d_o[i];
    always @ (posedge clk or posedge rst)
    if (rst)
        d_i[i] <= 1'b0;
    else
        d_i[i] <= io_pad[i];
    assign #1 io_pad[i] = (oe_q[i]) ? d_o_q[i] : 1'bz;
end
endgenerate
endmodule
module vl_o_ddr (d_h_i, d_l_i, o_pad, clk, rst);
parameter width = 1;
input  [width-1:0] d_h_i, d_l_i;
output [width-1:0] o_pad;
input clk, rst;
reg [width-1:0] ff1;
reg [width-1:0] ff2;
genvar i;
generate
for (i=0;i<width;i=i+1) begin : ddr
    always @ (posedge clk or posedge rst)
    if (rst)
        ff1[i] <= 1'b0;
    else
        ff1[i] <= d_h_i[i];
    always @ (posedge clk or posedge rst)
    if (rst)
        ff2[i] <= 1'b0;
    else
        ff2[i] <= d_l_i[i];
    assign o_pad = (clk) ? ff1 : ff2;
end
endgenerate
endmodule
module vl_o_clk ( clk_o_pad, clk, rst);
input clk, rst;
output clk_o_pad;
vl_o_ddr o_ddr0( .d_h_i(1'b1), .d_l_i(1'b0), .o_pad(clk_o_pad), .clk(clk), .rst(rst));
endmodule
//////////////////////////////////////////////////////////////////////
////                                                              ////
////  Versatile counter                                           ////
////                                                              ////
////  Description                                                 ////
////  Versatile counter, a reconfigurable binary, gray or LFSR    ////
////  counter                                                     ////
////                                                              ////
////  To Do:                                                      ////
////   - add LFSR with more taps                                  ////
////                                                              ////
////  Author(s):                                                  ////
////      - Michael Unneback, unneback@opencores.org              ////
////        ORSoC AB                                              ////
////                                                              ////
//////////////////////////////////////////////////////////////////////
////                                                              ////
//// Copyright (C) 2009 Authors and OPENCORES.ORG                 ////
////                                                              ////
//// This source file may be used and distributed without         ////
//// restriction provided that this copyright statement is not    ////
//// removed from the file and that any derivative work contains  ////
//// the original copyright notice and the associated disclaimer. ////
////                                                              ////
//// This source file is free software; you can redistribute it   ////
//// and/or modify it under the terms of the GNU Lesser General   ////
//// Public License as published by the Free Software Foundation; ////
//// either version 2.1 of the License, or (at your option) any   ////
//// later version.                                               ////
////                                                              ////
//// This source is distributed in the hope that it will be       ////
//// useful, but WITHOUT ANY WARRANTY; without even the implied   ////
//// warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR      ////
//// PURPOSE.  See the GNU Lesser General Public License for more ////
//// details.                                                     ////
////                                                              ////
//// You should have received a copy of the GNU Lesser General    ////
//// Public License along with this source; if not, download it   ////
//// from http://www.opencores.org/lgpl.shtml                     ////
////                                                              ////
//////////////////////////////////////////////////////////////////////
// binary counter
module vl_cnt_bin_ce (
 cke, q, rst, clk);
   parameter length = 4;
   input cke;
   output [length:1] q;
   input rst;
   input clk;
   parameter clear_value = 0;
   parameter set_value = 1;
   parameter wrap_value = 0;
   parameter level1_value = 15;
   reg  [length:1] qi;
   wire [length:1] q_next;
   assign q_next = qi + {{length-1{1'b0}},1'b1};
   always @ (posedge clk or posedge rst)
     if (rst)
       qi <= {length{1'b0}};
     else
     if (cke)
       qi <= q_next;
   assign q = qi;
endmodule
//////////////////////////////////////////////////////////////////////
////                                                              ////
////  Versatile counter                                           ////
////                                                              ////
////  Description                                                 ////
////  Versatile counter, a reconfigurable binary, gray or LFSR    ////
////  counter                                                     ////
////                                                              ////
////  To Do:                                                      ////
////   - add LFSR with more taps                                  ////
////                                                              ////
////  Author(s):                                                  ////
////      - Michael Unneback, unneback@opencores.org              ////
////        ORSoC AB                                              ////
////                                                              ////
//////////////////////////////////////////////////////////////////////
////                                                              ////
//// Copyright (C) 2009 Authors and OPENCORES.ORG                 ////
////                                                              ////
//// This source file may be used and distributed without         ////
//// restriction provided that this copyright statement is not    ////
//// removed from the file and that any derivative work contains  ////
//// the original copyright notice and the associated disclaimer. ////
////                                                              ////
//// This source file is free software; you can redistribute it   ////
//// and/or modify it under the terms of the GNU Lesser General   ////
//// Public License as published by the Free Software Foundation; ////
//// either version 2.1 of the License, or (at your option) any   ////
//// later version.                                               ////
////                                                              ////
//// This source is distributed in the hope that it will be       ////
//// useful, but WITHOUT ANY WARRANTY; without even the implied   ////
//// warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR      ////
//// PURPOSE.  See the GNU Lesser General Public License for more ////
//// details.                                                     ////
////                                                              ////
//// You should have received a copy of the GNU Lesser General    ////
//// Public License along with this source; if not, download it   ////
//// from http://www.opencores.org/lgpl.shtml                     ////
////                                                              ////
//////////////////////////////////////////////////////////////////////
// binary counter
module vl_cnt_bin_ce_rew_zq_l1 (
 cke, rew, zq, level1, rst, clk);
   parameter length = 4;
   input cke;
   input rew;
   output reg zq;
   output reg level1;
   input rst;
   input clk;
   parameter clear_value = 0;
   parameter set_value = 1;
   parameter wrap_value = 1;
   parameter level1_value = 15;
   wire clear;
   assign clear = 1'b0;
   reg  [length:1] qi;
   wire  [length:1] q_next, q_next_fw, q_next_rew;
   assign q_next_fw  = qi + {{length-1{1'b0}},1'b1};
   assign q_next_rew = qi - {{length-1{1'b0}},1'b1};
   assign q_next = rew ? q_next_rew : q_next_fw;
   always @ (posedge clk or posedge rst)
     if (rst)
       qi <= {length{1'b0}};
     else
     if (cke)
       qi <= q_next;
   always @ (posedge clk or posedge rst)
     if (rst)
       zq <= 1'b1;
     else
     if (cke)
       zq <= q_next == {length{1'b0}};
    always @ (posedge clk or posedge rst)
    if (rst)
        level1 <= 1'b0;
    else
    if (cke)
    if (clear)
        level1 <= 1'b0;
    else if (q_next == level1_value)
        level1 <= 1'b1;
    else if (qi == level1_value & rew)
        level1 <= 1'b0;
endmodule
//////////////////////////////////////////////////////////////////////
////                                                              ////
////  Versatile counter                                           ////
////                                                              ////
////  Description                                                 ////
////  Versatile counter, a reconfigurable binary, gray or LFSR    ////
////  counter                                                     ////
////                                                              ////
////  To Do:                                                      ////
////   - add LFSR with more taps                                  ////
////                                                              ////
////  Author(s):                                                  ////
////      - Michael Unneback, unneback@opencores.org              ////
////        ORSoC AB                                              ////
////                                                              ////
//////////////////////////////////////////////////////////////////////
////                                                              ////
//// Copyright (C) 2009 Authors and OPENCORES.ORG                 ////
////                                                              ////
//// This source file may be used and distributed without         ////
//// restriction provided that this copyright statement is not    ////
//// removed from the file and that any derivative work contains  ////
//// the original copyright notice and the associated disclaimer. ////
////                                                              ////
//// This source file is free software; you can redistribute it   ////
//// and/or modify it under the terms of the GNU Lesser General   ////
//// Public License as published by the Free Software Foundation; ////
//// either version 2.1 of the License, or (at your option) any   ////
//// later version.                                               ////
////                                                              ////
//// This source is distributed in the hope that it will be       ////
//// useful, but WITHOUT ANY WARRANTY; without even the implied   ////
//// warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR      ////
//// PURPOSE.  See the GNU Lesser General Public License for more ////
//// details.                                                     ////
////                                                              ////
//// You should have received a copy of the GNU Lesser General    ////
//// Public License along with this source; if not, download it   ////
//// from http://www.opencores.org/lgpl.shtml                     ////
////                                                              ////
//////////////////////////////////////////////////////////////////////
// binary counter
module vl_cnt_bin_ce_rew_q_zq_l1 (
 cke, rew, q, zq, level1, rst, clk);
   parameter length = 4;
   input cke;
   input rew;
   output [length:1] q;
   output reg zq;
   output reg level1;
   input rst;
   input clk;
   parameter clear_value = 0;
   parameter set_value = 1;
   parameter wrap_value = 1;
   parameter level1_value = 15;
   wire clear;
   assign clear = 1'b0;
   reg  [length:1] qi;
   wire  [length:1] q_next, q_next_fw, q_next_rew;
   assign q_next_fw  = qi + {{length-1{1'b0}},1'b1};
   assign q_next_rew = qi - {{length-1{1'b0}},1'b1};
   assign q_next = rew ? q_next_rew : q_next_fw;
   always @ (posedge clk or posedge rst)
     if (rst)
       qi <= {length{1'b0}};
     else
     if (cke)
       qi <= q_next;
   assign q = qi;
   always @ (posedge clk or posedge rst)
     if (rst)
       zq <= 1'b1;
     else
     if (cke)
       zq <= q_next == {length{1'b0}};
    always @ (posedge clk or posedge rst)
    if (rst)
        level1 <= 1'b0;
    else
    if (cke)
    if (clear)
        level1 <= 1'b0;
    else if (q_next == level1_value)
        level1 <= 1'b1;
    else if (qi == level1_value & rew)
        level1 <= 1'b0;
endmodule
//////////////////////////////////////////////////////////////////////
////                                                              ////
////  Versatile counter                                           ////
////                                                              ////
////  Description                                                 ////
////  Versatile counter, a reconfigurable binary, gray or LFSR    ////
////  counter                                                     ////
////                                                              ////
////  To Do:                                                      ////
////   - add LFSR with more taps                                  ////
////                                                              ////
////  Author(s):                                                  ////
////      - Michael Unneback, unneback@opencores.org              ////
////        ORSoC AB                                              ////
////                                                              ////
//////////////////////////////////////////////////////////////////////
////                                                              ////
//// Copyright (C) 2009 Authors and OPENCORES.ORG                 ////
////                                                              ////
//// This source file may be used and distributed without         ////
//// restriction provided that this copyright statement is not    ////
//// removed from the file and that any derivative work contains  ////
//// the original copyright notice and the associated disclaimer. ////
////                                                              ////
//// This source file is free software; you can redistribute it   ////
//// and/or modify it under the terms of the GNU Lesser General   ////
//// Public License as published by the Free Software Foundation; ////
//// either version 2.1 of the License, or (at your option) any   ////
//// later version.                                               ////
////                                                              ////
//// This source is distributed in the hope that it will be       ////
//// useful, but WITHOUT ANY WARRANTY; without even the implied   ////
//// warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR      ////
//// PURPOSE.  See the GNU Lesser General Public License for more ////
//// details.                                                     ////
////                                                              ////
//// You should have received a copy of the GNU Lesser General    ////
//// Public License along with this source; if not, download it   ////
//// from http://www.opencores.org/lgpl.shtml                     ////
////                                                              ////
//////////////////////////////////////////////////////////////////////
// LFSR counter
module vl_cnt_lfsr_zq (
 zq, rst, clk);
   parameter length = 4;
   output reg zq;
   input rst;
   input clk;
   parameter clear_value = 0;
   parameter set_value = 1;
   parameter wrap_value = 8;
   parameter level1_value = 15;
   reg  [length:1] qi;
   reg lfsr_fb;
   wire [length:1] q_next;
   reg [32:1] polynom;
   integer i;
   always @ (qi)
   begin
        case (length)
         2: polynom = 32'b11;                               // 0x3
         3: polynom = 32'b110;                              // 0x6
         4: polynom = 32'b1100;                             // 0xC
         5: polynom = 32'b10100;                            // 0x14
         6: polynom = 32'b110000;                           // 0x30
         7: polynom = 32'b1100000;                          // 0x60
         8: polynom = 32'b10111000;                         // 0xb8
         9: polynom = 32'b100010000;                        // 0x110
        10: polynom = 32'b1001000000;                       // 0x240
        11: polynom = 32'b10100000000;                      // 0x500
        12: polynom = 32'b100000101001;                     // 0x829
        13: polynom = 32'b1000000001100;                    // 0x100C
        14: polynom = 32'b10000000010101;                   // 0x2015
        15: polynom = 32'b110000000000000;                  // 0x6000
        16: polynom = 32'b1101000000001000;                 // 0xD008
        17: polynom = 32'b10010000000000000;                // 0x12000
        18: polynom = 32'b100000010000000000;               // 0x20400
        19: polynom = 32'b1000000000000100011;              // 0x40023
        20: polynom = 32'b10010000000000000000;             // 0x90000
        21: polynom = 32'b101000000000000000000;            // 0x140000
        22: polynom = 32'b1100000000000000000000;           // 0x300000
        23: polynom = 32'b10000100000000000000000;          // 0x420000
        24: polynom = 32'b111000010000000000000000;         // 0xE10000
        25: polynom = 32'b1001000000000000000000000;        // 0x1200000
        26: polynom = 32'b10000000000000000000100011;       // 0x2000023
        27: polynom = 32'b100000000000000000000010011;      // 0x4000013
        28: polynom = 32'b1100100000000000000000000000;     // 0xC800000
        29: polynom = 32'b10100000000000000000000000000;    // 0x14000000
        30: polynom = 32'b100000000000000000000000101001;   // 0x20000029
        31: polynom = 32'b1001000000000000000000000000000;  // 0x48000000
        32: polynom = 32'b10000000001000000000000000000011; // 0x80200003
        default: polynom = 32'b0;
        endcase
        lfsr_fb = qi[length];
        for (i=length-1; i>=1; i=i-1) begin
            if (polynom[i])
                lfsr_fb = lfsr_fb  ~^ qi[i];
        end
    end
   assign q_next = (qi == wrap_value) ? {length{1'b0}} :{qi[length-1:1],lfsr_fb};
   always @ (posedge clk or posedge rst)
     if (rst)
       qi <= {length{1'b0}};
     else
       qi <= q_next;
   always @ (posedge clk or posedge rst)
     if (rst)
       zq <= 1'b1;
     else
       zq <= q_next == {length{1'b0}};
endmodule
//////////////////////////////////////////////////////////////////////
////                                                              ////
////  Versatile counter                                           ////
////                                                              ////
////  Description                                                 ////
////  Versatile counter, a reconfigurable binary, gray or LFSR    ////
////  counter                                                     ////
////                                                              ////
////  To Do:                                                      ////
////   - add LFSR with more taps                                  ////
////                                                              ////
////  Author(s):                                                  ////
////      - Michael Unneback, unneback@opencores.org              ////
////        ORSoC AB                                              ////
////                                                              ////
//////////////////////////////////////////////////////////////////////
////                                                              ////
//// Copyright (C) 2009 Authors and OPENCORES.ORG                 ////
////                                                              ////
//// This source file may be used and distributed without         ////
//// restriction provided that this copyright statement is not    ////
//// removed from the file and that any derivative work contains  ////
//// the original copyright notice and the associated disclaimer. ////
////                                                              ////
//// This source file is free software; you can redistribute it   ////
//// and/or modify it under the terms of the GNU Lesser General   ////
//// Public License as published by the Free Software Foundation; ////
//// either version 2.1 of the License, or (at your option) any   ////
//// later version.                                               ////
////                                                              ////
//// This source is distributed in the hope that it will be       ////
//// useful, but WITHOUT ANY WARRANTY; without even the implied   ////
//// warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR      ////
//// PURPOSE.  See the GNU Lesser General Public License for more ////
//// details.                                                     ////
////                                                              ////
//// You should have received a copy of the GNU Lesser General    ////
//// Public License along with this source; if not, download it   ////
//// from http://www.opencores.org/lgpl.shtml                     ////
////                                                              ////
//////////////////////////////////////////////////////////////////////
// LFSR counter
module vl_cnt_lfsr_ce (
 cke, zq, rst, clk);
   parameter length = 4;
   input cke;
   output reg zq;
   input rst;
   input clk;
   parameter clear_value = 0;
   parameter set_value = 1;
   parameter wrap_value = 0;
   parameter level1_value = 15;
   reg  [length:1] qi;
   reg lfsr_fb;
   wire [length:1] q_next;
   reg [32:1] polynom;
   integer i;
   always @ (qi)
   begin
        case (length)
         2: polynom = 32'b11;                               // 0x3
         3: polynom = 32'b110;                              // 0x6
         4: polynom = 32'b1100;                             // 0xC
         5: polynom = 32'b10100;                            // 0x14
         6: polynom = 32'b110000;                           // 0x30
         7: polynom = 32'b1100000;                          // 0x60
         8: polynom = 32'b10111000;                         // 0xb8
         9: polynom = 32'b100010000;                        // 0x110
        10: polynom = 32'b1001000000;                       // 0x240
        11: polynom = 32'b10100000000;                      // 0x500
        12: polynom = 32'b100000101001;                     // 0x829
        13: polynom = 32'b1000000001100;                    // 0x100C
        14: polynom = 32'b10000000010101;                   // 0x2015
        15: polynom = 32'b110000000000000;                  // 0x6000
        16: polynom = 32'b1101000000001000;                 // 0xD008
        17: polynom = 32'b10010000000000000;                // 0x12000
        18: polynom = 32'b100000010000000000;               // 0x20400
        19: polynom = 32'b1000000000000100011;              // 0x40023
        20: polynom = 32'b10010000000000000000;             // 0x90000
        21: polynom = 32'b101000000000000000000;            // 0x140000
        22: polynom = 32'b1100000000000000000000;           // 0x300000
        23: polynom = 32'b10000100000000000000000;          // 0x420000
        24: polynom = 32'b111000010000000000000000;         // 0xE10000
        25: polynom = 32'b1001000000000000000000000;        // 0x1200000
        26: polynom = 32'b10000000000000000000100011;       // 0x2000023
        27: polynom = 32'b100000000000000000000010011;      // 0x4000013
        28: polynom = 32'b1100100000000000000000000000;     // 0xC800000
        29: polynom = 32'b10100000000000000000000000000;    // 0x14000000
        30: polynom = 32'b100000000000000000000000101001;   // 0x20000029
        31: polynom = 32'b1001000000000000000000000000000;  // 0x48000000
        32: polynom = 32'b10000000001000000000000000000011; // 0x80200003
        default: polynom = 32'b0;
        endcase
        lfsr_fb = qi[length];
        for (i=length-1; i>=1; i=i-1) begin
            if (polynom[i])
                lfsr_fb = lfsr_fb  ~^ qi[i];
        end
    end
   assign q_next = (qi == wrap_value) ? {length{1'b0}} :{qi[length-1:1],lfsr_fb};
   always @ (posedge clk or posedge rst)
     if (rst)
       qi <= {length{1'b0}};
     else
     if (cke)
       qi <= q_next;
   always @ (posedge clk or posedge rst)
     if (rst)
       zq <= 1'b1;
     else
     if (cke)
       zq <= q_next == {length{1'b0}};
endmodule
//////////////////////////////////////////////////////////////////////
////                                                              ////
////  Versatile counter                                           ////
////                                                              ////
////  Description                                                 ////
////  Versatile counter, a reconfigurable binary, gray or LFSR    ////
////  counter                                                     ////
////                                                              ////
////  To Do:                                                      ////
////   - add LFSR with more taps                                  ////
////                                                              ////
////  Author(s):                                                  ////
////      - Michael Unneback, unneback@opencores.org              ////
////        ORSoC AB                                              ////
////                                                              ////
//////////////////////////////////////////////////////////////////////
////                                                              ////
//// Copyright (C) 2009 Authors and OPENCORES.ORG                 ////
////                                                              ////
//// This source file may be used and distributed without         ////
//// restriction provided that this copyright statement is not    ////
//// removed from the file and that any derivative work contains  ////
//// the original copyright notice and the associated disclaimer. ////
////                                                              ////
//// This source file is free software; you can redistribute it   ////
//// and/or modify it under the terms of the GNU Lesser General   ////
//// Public License as published by the Free Software Foundation; ////
//// either version 2.1 of the License, or (at your option) any   ////
//// later version.                                               ////
////                                                              ////
//// This source is distributed in the hope that it will be       ////
//// useful, but WITHOUT ANY WARRANTY; without even the implied   ////
//// warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR      ////
//// PURPOSE.  See the GNU Lesser General Public License for more ////
//// details.                                                     ////
////                                                              ////
//// You should have received a copy of the GNU Lesser General    ////
//// Public License along with this source; if not, download it   ////
//// from http://www.opencores.org/lgpl.shtml                     ////
////                                                              ////
//////////////////////////////////////////////////////////////////////
// GRAY counter
module vl_cnt_gray_ce_bin (
 cke, q, q_bin, rst, clk);
   parameter length = 4;
   input cke;
   output reg [length:1] q;
   output [length:1] q_bin;
   input rst;
   input clk;
   parameter clear_value = 0;
   parameter set_value = 1;
   parameter wrap_value = 8;
   parameter level1_value = 15;
   reg  [length:1] qi;
   wire [length:1] q_next;
   assign q_next = qi + {{length-1{1'b0}},1'b1};
   always @ (posedge clk or posedge rst)
     if (rst)
       qi <= {length{1'b0}};
     else
     if (cke)
       qi <= q_next;
   always @ (posedge clk or posedge rst)
     if (rst)
       q <= {length{1'b0}};
     else
       if (cke)
         q <= (q_next>>1) ^ q_next;
   assign q_bin = qi;
endmodule
//////////////////////////////////////////////////////////////////////
////                                                              ////
////  Versatile library, counters                                 ////
////                                                              ////
////  Description                                                 ////
////  counters                                                    ////
////                                                              ////
////                                                              ////
////  To Do:                                                      ////
////   - add more counters                                        ////
////                                                              ////
////  Author(s):                                                  ////
////      - Michael Unneback, unneback@opencores.org              ////
////        ORSoC AB                                              ////
////                                                              ////
//////////////////////////////////////////////////////////////////////
////                                                              ////
//// Copyright (C) 2010 Authors and OPENCORES.ORG                 ////
////                                                              ////
//// This source file may be used and distributed without         ////
//// restriction provided that this copyright statement is not    ////
//// removed from the file and that any derivative work contains  ////
//// the original copyright notice and the associated disclaimer. ////
////                                                              ////
//// This source file is free software; you can redistribute it   ////
//// and/or modify it under the terms of the GNU Lesser General   ////
//// Public License as published by the Free Software Foundation; ////
//// either version 2.1 of the License, or (at your option) any   ////
//// later version.                                               ////
////                                                              ////
//// This source is distributed in the hope that it will be       ////
//// useful, but WITHOUT ANY WARRANTY; without even the implied   ////
//// warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR      ////
//// PURPOSE.  See the GNU Lesser General Public License for more ////
//// details.                                                     ////
////                                                              ////
//// You should have received a copy of the GNU Lesser General    ////
//// Public License along with this source; if not, download it   ////
//// from http://www.opencores.org/lgpl.shtml                     ////
////                                                              ////
//////////////////////////////////////////////////////////////////////
module vl_cnt_shreg_wrap ( q, rst, clk);
   parameter length = 4;
   output reg [0:length-1] q;
   input rst;
   input clk;
    always @ (posedge clk or posedge rst)
    if (rst)
        q <= {1'b1,{length-1{1'b0}}};
    else
        q <= {q[length-1],q[0:length-2]};
endmodule
module vl_cnt_shreg_ce_wrap ( cke, q, rst, clk);
   parameter length = 4;
   input cke;
   output reg [0:length-1] q;
   input rst;
   input clk;
    always @ (posedge clk or posedge rst)
    if (rst)
        q <= {1'b1,{length-1{1'b0}}};
    else
        if (cke)
            q <= {q[length-1],q[0:length-2]};
endmodule
module vl_cnt_shreg_clear ( clear, q, rst, clk);
   parameter length = 4;
   input clear;
   output reg [0:length-1] q;
   input rst;
   input clk;
    always @ (posedge clk or posedge rst)
    if (rst)
        q <= {1'b1,{length-1{1'b0}}};
    else
        if (clear)
            q <= {1'b1,{length-1{1'b0}}};
        else
            q <= q >> 1;
endmodule
module vl_cnt_shreg_ce_clear ( cke, clear, q, rst, clk);
   parameter length = 4;
   input cke, clear;
   output reg [0:length-1] q;
   input rst;
   input clk;
    always @ (posedge clk or posedge rst)
    if (rst)
        q <= {1'b1,{length-1{1'b0}}};
    else
        if (cke)
            if (clear)
                q <= {1'b1,{length-1{1'b0}}};
            else
                q <= q >> 1;
endmodule
module vl_cnt_shreg_ce_clear_wrap ( cke, clear, q, rst, clk);
   parameter length = 4;
   input cke, clear;
   output reg [0:length-1] q;
   input rst;
   input clk;
    always @ (posedge clk or posedge rst)
    if (rst)
        q <= {1'b1,{length-1{1'b0}}};
    else
        if (cke)
            if (clear)
                q <= {1'b1,{length-1{1'b0}}};
            else
            q <= {q[length-1],q[0:length-2]};
endmodule
//////////////////////////////////////////////////////////////////////
////                                                              ////
////  Versatile library, memories                                 ////
////                                                              ////
////  Description                                                 ////
////  memories                                                    ////
////                                                              ////
////                                                              ////
////  To Do:                                                      ////
////   - add more memory types                                    ////
////                                                              ////
////  Author(s):                                                  ////
////      - Michael Unneback, unneback@opencores.org              ////
////        ORSoC AB                                              ////
////                                                              ////
//////////////////////////////////////////////////////////////////////
////                                                              ////
//// Copyright (C) 2010 Authors and OPENCORES.ORG                 ////
////                                                              ////
//// This source file may be used and distributed without         ////
//// restriction provided that this copyright statement is not    ////
//// removed from the file and that any derivative work contains  ////
//// the original copyright notice and the associated disclaimer. ////
////                                                              ////
//// This source file is free software; you can redistribute it   ////
//// and/or modify it under the terms of the GNU Lesser General   ////
//// Public License as published by the Free Software Foundation; ////
//// either version 2.1 of the License, or (at your option) any   ////
//// later version.                                               ////
////                                                              ////
//// This source is distributed in the hope that it will be       ////
//// useful, but WITHOUT ANY WARRANTY; without even the implied   ////
//// warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR      ////
//// PURPOSE.  See the GNU Lesser General Public License for more ////
//// details.                                                     ////
////                                                              ////
//// You should have received a copy of the GNU Lesser General    ////
//// Public License along with this source; if not, download it   ////
//// from http://www.opencores.org/lgpl.shtml                     ////
////                                                              ////
//////////////////////////////////////////////////////////////////////
/// ROM
module vl_rom_init ( adr, q, clk);
   parameter data_width = 32;
   parameter addr_width = 8;
   parameter mem_size = 1<<addr_width;
   input [(addr_width-1):0]       adr;
   output reg [(data_width-1):0] q;
   input                         clk;
   reg [data_width-1:0] rom [mem_size-1:0];
   parameter memory_file = "vl_rom.vmem";
   initial
     begin
        $readmemh(memory_file, rom);
     end
   always @ (posedge clk)
     q <= rom[adr];
endmodule
// Single port RAM
module vl_ram ( d, adr, we, q, clk);
   parameter data_width = 32;
   parameter addr_width = 8;
   parameter mem_size = 1<<addr_width;
   parameter debug = 0;
   input [(data_width-1):0]      d;
   input [(addr_width-1):0]       adr;
   input                         we;
   output reg [(data_width-1):0] q;
   input                         clk;
   reg [data_width-1:0] ram [mem_size-1:0];
    parameter memory_init = 0;
    parameter memory_file = "vl_ram.vmem";
    generate
    if (memory_init == 1) begin : init_mem
        initial
            $readmemh(memory_file, ram);
   end else if (memory_init == 2) begin : init_zero
        integer k;
        initial
            for (k = 0; k < mem_size; k = k + 1)
                ram[k] = 0;
   end
   endgenerate
    generate
    if (debug==1) begin : debug_we
        always @ (posedge clk)
        if (we)
            $display ("Value %h written at address %h : time %t", d, adr, $time);
    end
    endgenerate
   always @ (posedge clk)
   begin
   if (we)
     ram[adr] <= d;
   q <= ram[adr];
   end
endmodule
module vl_ram_be ( d, adr, be, we, q, clk);
   parameter data_width = 32;
   parameter addr_width = 6;
   parameter mem_size = 1<<addr_width;
   input [(data_width-1):0]      d;
   input [(addr_width-1):0]       adr;
   input [(data_width/8)-1:0]    be;
   input                         we;
   output reg [(data_width-1):0] q;
   input                         clk;
`ifdef SYSTEMVERILOG
    // use a multi-dimensional packed array
    //t o model individual bytes within the word
    logic [data_width/8-1:0][7:0] ram [0:mem_size-1];// # words = 1 << address width
`else
    reg [data_width-1:0] ram [mem_size-1:0];
    wire [data_width/8-1:0] cke;
`endif
    parameter memory_init = 0;
    parameter memory_file = "vl_ram.vmem";
    generate
    if (memory_init == 1) begin : init_mem
        initial
            $readmemh(memory_file, ram);
    end else if (memory_init == 2) begin : init_zero
        integer k;
        initial
            for (k = 0; k < mem_size; k = k + 1)
                ram[k] = 0;
    end
   endgenerate
`ifdef SYSTEMVERILOG
always_ff@(posedge clk)
begin
    if(we) begin
        if(be[3]) ram[adr][3] <= d[31:24];
        if(be[2]) ram[adr][2] <= d[23:16];
        if(be[1]) ram[adr][1] <= d[15:8];
        if(be[0]) ram[adr][0] <= d[7:0];
    end
        q <= ram[adr];
end
`else
assign cke = {data_width/8{we}} & be;
   genvar i;
   generate for (i=0;i<data_width/8;i=i+1) begin : be_ram
      always @ (posedge clk)
      if (cke[i])
        ram[adr][(i+1)*8-1:i*8] <= d[(i+1)*8-1:i*8];
   end
   endgenerate
   always @ (posedge clk)
      q <= ram[adr];
`endif
`ifdef verilator
   // Function to access RAM (for use by Verilator).
   function [31:0] get_mem;
      // verilator public
      input [addr_width-1:0]             addr;
      get_mem = ram[addr];
   endfunction // get_mem
   // Function to write RAM (for use by Verilator).
   function set_mem;
      // verilator public
      input [addr_width-1:0]             addr;
      input [data_width-1:0]             data;
      ram[addr] = data;
   endfunction // set_mem
`endif
endmodule
module vl_dpram_1r1w ( d_a, adr_a, we_a, clk_a, q_b, adr_b, clk_b );
   parameter data_width = 32;
   parameter addr_width = 8;
   parameter mem_size = 1<<addr_width;
   input [(data_width-1):0]      d_a;
   input [(addr_width-1):0]       adr_a;
   input [(addr_width-1):0]       adr_b;
   input                         we_a;
   output reg [(data_width-1):0]          q_b;
   input                         clk_a, clk_b;
   reg [data_width-1:0] ram [0:mem_size-1] /*synthesis syn_ramstyle = "no_rw_check"*/;
    parameter memory_init = 0;
    parameter memory_file = "vl_ram.vmem";
    parameter debug = 0;
    generate
    if (memory_init == 1) begin : init_mem
        initial
            $readmemh(memory_file, ram);
    end else if (memory_init == 2) begin : init_zero
        integer k;
        initial
            for (k = 0; k < mem_size; k = k + 1)
                ram[k] = 0;
    end
   endgenerate
    generate
    if (debug==1) begin : debug_we
        always @ (posedge clk_a)
        if (we_a)
            $display ("Debug: Value %h written at address %h : time %t", d_a, adr_a, $time);
    end
    endgenerate
   always @ (posedge clk_a)
   if (we_a)
     ram[adr_a] <= d_a;
   always @ (posedge clk_b)
      q_b = ram[adr_b];
endmodule
module vl_dpram_2r1w ( d_a, q_a, adr_a, we_a, clk_a, q_b, adr_b, clk_b );
   parameter data_width = 32;
   parameter addr_width = 8;
   parameter mem_size = 1<<addr_width;
   input [(data_width-1):0]      d_a;
   input [(addr_width-1):0]       adr_a;
   input [(addr_width-1):0]       adr_b;
   input                         we_a;
   output [(data_width-1):0]      q_b;
   output reg [(data_width-1):0] q_a;
   input                         clk_a, clk_b;
   reg [(data_width-1):0]         q_b;
   reg [data_width-1:0] ram [0:mem_size-1] /*synthesis syn_ramstyle = "no_rw_check"*/;
    parameter memory_init = 0;
    parameter memory_file = "vl_ram.vmem";
    parameter debug = 0;
    generate
    if (memory_init == 1) begin : init_mem
        initial
            $readmemh(memory_file, ram);
    end else if (memory_init == 2) begin : init_zero
        integer k;
        initial
            for (k = 0; k < mem_size; k = k + 1)
                ram[k] = 0;
    end
   endgenerate
    generate
    if (debug==1) begin : debug_we
        always @ (posedge clk_a)
        if (we_a)
            $display ("Debug: Value %h written at address %h : time %t", d_a, adr_a, $time);
    end
    endgenerate
   always @ (posedge clk_a)
     begin
        q_a <= ram[adr_a];
        if (we_a)
             ram[adr_a] <= d_a;
     end
   always @ (posedge clk_b)
          q_b <= ram[adr_b];
endmodule
module vl_dpram_1r2w ( d_a, q_a, adr_a, we_a, clk_a, d_b, adr_b, we_b, clk_b );
   parameter data_width = 32;
   parameter addr_width = 8;
   parameter mem_size = 1<<addr_width;
   input [(data_width-1):0]      d_a;
   input [(addr_width-1):0]       adr_a;
   input [(addr_width-1):0]       adr_b;
   input                         we_a;
   input [(data_width-1):0]       d_b;
   output reg [(data_width-1):0] q_a;
   input                         we_b;
   input                         clk_a, clk_b;
   reg [(data_width-1):0]         q_b;
   reg [data_width-1:0] ram [0:mem_size-1] /*synthesis syn_ramstyle = "no_rw_check"*/;
    parameter memory_init = 0;
    parameter memory_file = "vl_ram.vmem";
    parameter debug = 0;
    generate
    if (memory_init == 1) begin : init_mem
        initial
            $readmemh(memory_file, ram);
    end else if (memory_init == 2) begin : init_zero
        integer k;
        initial
            for (k = 0; k < mem_size; k = k + 1)
                ram[k] = 0;
    end
   endgenerate
    generate
    if (debug==1) begin : debug_we
        always @ (posedge clk_a)
        if (we_a)
            $display ("Debug: Value %h written at address %h : time %t", d_a, adr_a, $time);
        always @ (posedge clk_b)
        if (we_b)
            $display ("Debug: Value %h written at address %h : time %t", d_b, adr_b, $time);
    end
    endgenerate
   always @ (posedge clk_a)
     begin
        q_a <= ram[adr_a];
        if (we_a)
             ram[adr_a] <= d_a;
     end
   always @ (posedge clk_b)
     begin
        if (we_b)
          ram[adr_b] <= d_b;
     end
endmodule
module vl_dpram_2r2w ( d_a, q_a, adr_a, we_a, clk_a, d_b, q_b, adr_b, we_b, clk_b );
   parameter data_width = 32;
   parameter addr_width = 8;
   parameter mem_size = 1<<addr_width;
   input [(data_width-1):0]      d_a;
   input [(addr_width-1):0]       adr_a;
   input [(addr_width-1):0]       adr_b;
   input                         we_a;
   output [(data_width-1):0]      q_b;
   input [(data_width-1):0]       d_b;
   output reg [(data_width-1):0] q_a;
   input                         we_b;
   input                         clk_a, clk_b;
   reg [(data_width-1):0]         q_b;
   reg [data_width-1:0] ram [0:mem_size-1] /*synthesis syn_ramstyle = "no_rw_check"*/;
    parameter memory_init = 0;
    parameter memory_file = "vl_ram.vmem";
    parameter debug = 0;
    generate
    if (memory_init) begin : init_mem
        initial
            $readmemh(memory_file, ram);
    end else if (memory_init == 2) begin : init_zero
        integer k;
        initial
            for (k = 0; k < mem_size; k = k + 1)
                ram[k] = 0;
    end
   endgenerate
    generate
    if (debug==1) begin : debug_we
        always @ (posedge clk_a)
        if (we_a)
            $display ("Debug: Value %h written at address %h : time %t", d_a, adr_a, $time);
        always @ (posedge clk_b)
        if (we_b)
            $display ("Debug: Value %h written at address %h : time %t", d_b, adr_b, $time);
    end
    endgenerate
   always @ (posedge clk_a)
     begin
        q_a <= ram[adr_a];
        if (we_a)
             ram[adr_a] <= d_a;
     end
   always @ (posedge clk_b)
     begin
        q_b <= ram[adr_b];
        if (we_b)
          ram[adr_b] <= d_b;
     end
endmodule
module vl_dpram_be_2r2w ( d_a, q_a, adr_a, be_a, we_a, clk_a, d_b, q_b, adr_b, be_b, we_b, clk_b );
   parameter a_data_width = 32;
   parameter a_addr_width = 8;
   parameter b_data_width = 64; //a_data_width;
   //localparam b_addr_width = a_data_width * a_addr_width / b_data_width;
   localparam b_addr_width =
        (a_data_width==b_data_width) ? a_addr_width :
        (a_data_width==b_data_width*2) ? a_addr_width+1 :
        (a_data_width==b_data_width*4) ? a_addr_width+2 :
        (a_data_width==b_data_width*8) ? a_addr_width+3 :
        (a_data_width==b_data_width*16) ? a_addr_width+4 :
        (a_data_width==b_data_width*32) ? a_addr_width+5 :
        (a_data_width==b_data_width/2) ? a_addr_width-1 :
        (a_data_width==b_data_width/4) ? a_addr_width-2 :
        (a_data_width==b_data_width/8) ? a_addr_width-3 :
        (a_data_width==b_data_width/16) ? a_addr_width-4 :
        (a_data_width==b_data_width/32) ? a_addr_width-5 : 0;
   localparam ratio = (a_addr_width>b_addr_width) ? (a_addr_width/b_addr_width) : (b_addr_width/a_addr_width);
   parameter mem_size = (a_addr_width>b_addr_width) ? (1<<b_addr_width) : (1<<a_addr_width);
   parameter memory_init = 0;
   parameter memory_file = "vl_ram.vmem";
   parameter debug = 0;
   input [(a_data_width-1):0]      d_a;
   input [(a_addr_width-1):0]       adr_a;
   input [(a_data_width/8-1):0]    be_a;
   input                           we_a;
   output reg [(a_data_width-1):0] q_a;
   input [(b_data_width-1):0]       d_b;
   input [(b_addr_width-1):0]       adr_b;
   input [(b_data_width/8-1):0]    be_b;
   input                           we_b;
   output reg [(b_data_width-1):0]          q_b;
   input                           clk_a, clk_b;
    generate
    if (debug==1) begin : debug_we
        always @ (posedge clk_a)
        if (we_a)
            $display ("Debug: Value %h written at address %h : time %t", d_a, adr_a, $time);
        always @ (posedge clk_b)
        if (we_b)
            $display ("Debug: Value %h written at address %h : time %t", d_b, adr_b, $time);
    end
    endgenerate
`ifdef SYSTEMVERILOG
// use a multi-dimensional packed array
//to model individual bytes within the word
generate
if (a_data_width==32 & b_data_width==32) begin : dpram_3232
    logic [0:3][7:0] ram [0:mem_size-1] /*synthesis syn_ramstyle = "no_rw_check"*/;
    initial
        if (memory_init==1)
            $readmemh(memory_file, ram);
    integer k;
    initial
        if (memory_init==2)
            for (k = 0; k < mem_size; k = k + 1)
                ram[k] = 0;
    always_ff@(posedge clk_a)
    begin
        if(we_a) begin
            if(be_a[3]) ram[adr_a][0] <= d_a[31:24];
            if(be_a[2]) ram[adr_a][1] <= d_a[23:16];
            if(be_a[1]) ram[adr_a][2] <= d_a[15:8];
            if(be_a[0]) ram[adr_a][3] <= d_a[7:0];
        end
    end
    always@(posedge clk_a)
        q_a = ram[adr_a];
    always_ff@(posedge clk_b)
    begin
        if(we_b) begin
            if(be_b[3]) ram[adr_b][0] <= d_b[31:24];
            if(be_b[2]) ram[adr_b][1] <= d_b[23:16];
            if(be_b[1]) ram[adr_b][2] <= d_b[15:8];
            if(be_b[0]) ram[adr_b][3] <= d_b[7:0];
        end
    end
    always@(posedge clk_b)
        q_b = ram[adr_b];
end
endgenerate
generate
if (a_data_width==64 & b_data_width==64) begin : dpram_6464
    logic [0:7][7:0] ram [0:mem_size-1] /*synthesis syn_ramstyle = "no_rw_check"*/;
    initial
        if (memory_init==1)
            $readmemh(memory_file, ram);
    integer k;
    initial
        if (memory_init==2)
            for (k = 0; k < mem_size; k = k + 1)
                ram[k] = 0;
    always_ff@(posedge clk_a)
    begin
        if(we_a) begin
            if(be_a[7]) ram[adr_a][7] <= d_a[63:56];
            if(be_a[6]) ram[adr_a][6] <= d_a[55:48];
            if(be_a[5]) ram[adr_a][5] <= d_a[47:40];
            if(be_a[4]) ram[adr_a][4] <= d_a[39:32];
            if(be_a[3]) ram[adr_a][3] <= d_a[31:24];
            if(be_a[2]) ram[adr_a][2] <= d_a[23:16];
            if(be_a[1]) ram[adr_a][1] <= d_a[15:8];
            if(be_a[0]) ram[adr_a][0] <= d_a[7:0];
        end
    end
    always@(posedge clk_a)
        q_a = ram[adr_a];
    always_ff@(posedge clk_b)
    begin
        if(we_b) begin
            if(be_b[7]) ram[adr_b][7] <= d_b[63:56];
            if(be_b[6]) ram[adr_b][6] <= d_b[55:48];
            if(be_b[5]) ram[adr_b][5] <= d_b[47:40];
            if(be_b[4]) ram[adr_b][4] <= d_b[39:32];
            if(be_b[3]) ram[adr_b][3] <= d_b[31:24];
            if(be_b[2]) ram[adr_b][2] <= d_b[23:16];
            if(be_b[1]) ram[adr_b][1] <= d_b[15:8];
            if(be_b[0]) ram[adr_b][0] <= d_b[7:0];
        end
    end
    always@(posedge clk_b)
        q_b = ram[adr_b];
end
endgenerate
generate
if (a_data_width==32 & b_data_width==16) begin : dpram_3216
logic [31:0] temp;
vl_dpram_be_2r2w # (.a_data_width(32), .b_data_width(32), .a_addr_width(a_addr_width), .mem_size(mem_size), .memory_init(memory_init), .memory_file(memory_file))
dpram3232 (
    .d_a(d_a),
    .q_a(q_a),
    .adr_a(adr_a),
    .be_a(be_a),
    .we_a(we_a),
    .clk_a(clk_a),
    .d_b({d_b,d_b}),
    .q_b(temp),
    .adr_b(adr_b[b_addr_width-1:1]),
    .be_b({be_b,be_b} & {{2{adr_b[0]}},{2{!adr_b[0]}}}),
    .we_b(we_b),
    .clk_b(clk_b)
);
always @ (adr_b[0] or temp)
    if (adr_b[0])
        q_b = temp[31:16];
    else
        q_b = temp[15:0];
end
endgenerate
generate
if (a_data_width==32 & b_data_width==64) begin : dpram_3264
logic [63:0] temp;
vl_dpram_be_2r2w # (.a_data_width(32), .b_data_width(64), .a_addr_width(a_addr_width), .mem_size(mem_size), .memory_init(memory_init), .memory_file(memory_file))
dpram6464 (
    .d_a({d_a,d_a}),
    .q_a(temp),
    .adr_a(adr_a[a_addr_width-1:1]),
    .be_a({be_a,be_a} & {{4{adr_a[0]}},{4{!adr_a[0]}}}),
    .we_a(we_a),
    .clk_a(clk_a),
    .d_b(d_b),
    .q_b(q_b),
    .adr_b(adr_b),
    .be_b(be_b),
    .we_b(we_b),
    .clk_b(clk_b)
);
always @ (adr_a[0] or temp)
    if (adr_a[0])
        q_a = temp[63:32];
    else
        q_a = temp[31:0];
end
endgenerate
`else
    // This modules requires SystemVerilog
    // at this point anyway
`endif
endmodule
// FIFO
module vl_fifo_1r1w_fill_level_sync (
    d, wr, fifo_full,
    q, rd, fifo_empty,
    fill_level,
    clk, rst
    );
parameter data_width = 18;
parameter addr_width = 4;
// write side
input  [data_width-1:0] d;
input                   wr;
output                  fifo_full;
// read side
output [data_width-1:0] q;
input                   rd;
output                  fifo_empty;
// common
output [addr_width:0]   fill_level;
input rst, clk;
wire [addr_width:1] wadr, radr;
vl_cnt_bin_ce
    # ( .length(addr_width))
    fifo_wr_adr( .cke(wr), .q(wadr), .rst(rst), .clk(clk));
vl_cnt_bin_ce
    # (.length(addr_width))
    fifo_rd_adr( .cke(rd), .q(radr), .rst(rst), .clk(clk));
vl_dpram_1r1w
    # (.data_width(data_width), .addr_width(addr_width))
    dpram ( .d_a(d), .adr_a(wadr), .we_a(wr), .clk_a(clk), .q_b(q), .adr_b(radr), .clk_b(clk));
vl_cnt_bin_ce_rew_q_zq_l1
    # (.length(addr_width+1), .level1_value(1<<addr_width))
    fill_level_cnt( .cke(rd ^ wr), .rew(rd), .q(fill_level), .zq(fifo_empty), .level1(fifo_full), .rst(rst), .clk(clk));
endmodule
// Intended use is two small FIFOs (RX and TX typically) in one FPGA RAM resource
// RAM is supposed to be larger than the two FIFOs
// LFSR counters used adr pointers
module vl_fifo_2r2w_sync_simplex (
    // a side
    a_d, a_wr, a_fifo_full,
    a_q, a_rd, a_fifo_empty,
    a_fill_level,
    // b side
    b_d, b_wr, b_fifo_full,
    b_q, b_rd, b_fifo_empty,
    b_fill_level,
    // common
    clk, rst
    );
parameter data_width = 8;
parameter addr_width = 5;
parameter fifo_full_level = (1<<addr_width)-1;
// a side
input  [data_width-1:0] a_d;
input                   a_wr;
output                  a_fifo_full;
output [data_width-1:0] a_q;
input                   a_rd;
output                  a_fifo_empty;
output [addr_width-1:0] a_fill_level;
// b side
input  [data_width-1:0] b_d;
input                   b_wr;
output                  b_fifo_full;
output [data_width-1:0] b_q;
input                   b_rd;
output                  b_fifo_empty;
output [addr_width-1:0] b_fill_level;
input                   clk;
input                   rst;
// adr_gen
wire [addr_width:1] a_wadr, a_radr;
wire [addr_width:1] b_wadr, b_radr;
// dpram
wire [addr_width:0] a_dpram_adr, b_dpram_adr;
vl_cnt_lfsr_ce
    # ( .length(addr_width))
    fifo_a_wr_adr( .cke(a_wr), .q(a_wadr), .rst(rst), .clk(clk));
vl_cnt_lfsr_ce
    # (.length(addr_width))
    fifo_a_rd_adr( .cke(a_rd), .q(a_radr), .rst(rst), .clk(clk));
vl_cnt_lfsr_ce
    # ( .length(addr_width))
    fifo_b_wr_adr( .cke(b_wr), .q(b_wadr), .rst(rst), .clk(clk));
vl_cnt_lfsr_ce
    # (.length(addr_width))
    fifo_b_rd_adr( .cke(b_rd), .q(b_radr), .rst(rst), .clk(clk));
// mux read or write adr to DPRAM
assign a_dpram_adr = (a_wr) ? {1'b0,a_wadr} : {1'b1,a_radr};
assign b_dpram_adr = (b_wr) ? {1'b1,b_wadr} : {1'b0,b_radr};
vl_dpram_2r2w
    # (.data_width(data_width), .addr_width(addr_width+1))
    dpram ( .d_a(a_d), .q_a(a_q), .adr_a(a_dpram_adr), .we_a(a_wr), .clk_a(a_clk),
            .d_b(b_d), .q_b(b_q), .adr_b(b_dpram_adr), .we_b(b_wr), .clk_b(b_clk));
vl_cnt_bin_ce_rew_zq_l1
    # (.length(addr_width), .level1_value(fifo_full_level))
    a_fill_level_cnt( .cke(a_rd ^ a_wr), .rew(a_rd), .q(a_fill_level), .zq(a_fifo_empty), .level1(a_fifo_full), .rst(rst), .clk(clk));
vl_cnt_bin_ce_rew_zq_l1
    # (.length(addr_width), .level1_value(fifo_full_level))
    b_fill_level_cnt( .cke(b_rd ^ b_wr), .rew(b_rd), .q(b_fill_level), .zq(b_fifo_empty), .level1(b_fifo_full), .rst(rst), .clk(clk));
endmodule
module vl_fifo_cmp_async ( wptr, rptr, fifo_empty, fifo_full, wclk, rclk, rst );
   parameter addr_width = 4;
   parameter N = addr_width-1;
   parameter Q1 = 2'b00;
   parameter Q2 = 2'b01;
   parameter Q3 = 2'b11;
   parameter Q4 = 2'b10;
   parameter going_empty = 1'b0;
   parameter going_full  = 1'b1;
   input [N:0]  wptr, rptr;
   output       fifo_empty;
   output       fifo_full;
   input        wclk, rclk, rst;
   wire direction;
   reg  direction_set, direction_clr;
   wire async_empty, async_full;
   wire fifo_full2;
   wire fifo_empty2;
   // direction_set
   always @ (wptr[N:N-1] or rptr[N:N-1])
     case ({wptr[N:N-1],rptr[N:N-1]})
       {Q1,Q2} : direction_set <= 1'b1;
       {Q2,Q3} : direction_set <= 1'b1;
       {Q3,Q4} : direction_set <= 1'b1;
       {Q4,Q1} : direction_set <= 1'b1;
       default : direction_set <= 1'b0;
     endcase
   // direction_clear
   always @ (wptr[N:N-1] or rptr[N:N-1] or rst)
     if (rst)
       direction_clr <= 1'b1;
     else
       case ({wptr[N:N-1],rptr[N:N-1]})
         {Q2,Q1} : direction_clr <= 1'b1;
         {Q3,Q2} : direction_clr <= 1'b1;
         {Q4,Q3} : direction_clr <= 1'b1;
         {Q1,Q4} : direction_clr <= 1'b1;
         default : direction_clr <= 1'b0;
       endcase
    vl_dff_sr dff_sr_dir( .aclr(direction_clr), .aset(direction_set), .clock(1'b1), .data(1'b1), .q(direction));
   assign async_empty = (wptr == rptr) && (direction==going_empty);
   assign async_full  = (wptr == rptr) && (direction==going_full);
    vl_dff_sr dff_sr_empty0( .aclr(rst), .aset(async_full), .clock(wclk), .data(async_full), .q(fifo_full2));
    vl_dff_sr dff_sr_empty1( .aclr(rst), .aset(async_full), .clock(wclk), .data(fifo_full2), .q(fifo_full));
/*
   always @ (posedge wclk or posedge rst or posedge async_full)
     if (rst)
       {fifo_full, fifo_full2} <= 2'b00;
     else if (async_full)
       {fifo_full, fifo_full2} <= 2'b11;
     else
       {fifo_full, fifo_full2} <= {fifo_full2, async_full};
*/
/*   always @ (posedge rclk or posedge async_empty)
     if (async_empty)
       {fifo_empty, fifo_empty2} <= 2'b11;
     else
       {fifo_empty,fifo_empty2} <= {fifo_empty2,async_empty}; */
    vl_dff # ( .reset_value(1'b1)) dff0 ( .d(async_empty), .q(fifo_empty2), .clk(rclk), .rst(async_empty));
    vl_dff # ( .reset_value(1'b1)) dff1 ( .d(fifo_empty2), .q(fifo_empty),  .clk(rclk), .rst(async_empty));
endmodule // async_compb
module vl_fifo_1r1w_async (
    d, wr, fifo_full, wr_clk, wr_rst,
    q, rd, fifo_empty, rd_clk, rd_rst
    );
parameter data_width = 18;
parameter addr_width = 4;
// write side
input  [data_width-1:0] d;
input                   wr;
output                  fifo_full;
input                   wr_clk;
input                   wr_rst;
// read side
output [data_width-1:0] q;
input                   rd;
output                  fifo_empty;
input                   rd_clk;
input                   rd_rst;
wire [addr_width:1] wadr, wadr_bin, radr, radr_bin;
vl_cnt_gray_ce_bin
    # ( .length(addr_width))
    fifo_wr_adr( .cke(wr), .q(wadr), .q_bin(wadr_bin), .rst(wr_rst), .clk(wr_clk));
vl_cnt_gray_ce_bin
    # (.length(addr_width))
    fifo_rd_adr( .cke(rd), .q(radr), .q_bin(radr_bin), .rst(rd_rst), .clk(rd_clk));
vl_dpram_1r1w
    # (.data_width(data_width), .addr_width(addr_width))
    dpram ( .d_a(d), .adr_a(wadr_bin), .we_a(wr), .clk_a(wr_clk), .q_b(q), .adr_b(radr_bin), .clk_b(rd_clk));
vl_fifo_cmp_async
    # (.addr_width(addr_width))
    cmp ( .wptr(wadr), .rptr(radr), .fifo_empty(fifo_empty), .fifo_full(fifo_full), .wclk(wr_clk), .rclk(rd_clk), .rst(wr_rst) );
endmodule
module vl_fifo_2r2w_async (
    // a side
    a_d, a_wr, a_fifo_full,
    a_q, a_rd, a_fifo_empty,
    a_clk, a_rst,
    // b side
    b_d, b_wr, b_fifo_full,
    b_q, b_rd, b_fifo_empty,
    b_clk, b_rst
    );
parameter data_width = 18;
parameter addr_width = 4;
// a side
input  [data_width-1:0] a_d;
input                   a_wr;
output                  a_fifo_full;
output [data_width-1:0] a_q;
input                   a_rd;
output                  a_fifo_empty;
input                   a_clk;
input                   a_rst;
// b side
input  [data_width-1:0] b_d;
input                   b_wr;
output                  b_fifo_full;
output [data_width-1:0] b_q;
input                   b_rd;
output                  b_fifo_empty;
input                   b_clk;
input                   b_rst;
vl_fifo_1r1w_async # (.data_width(data_width), .addr_width(addr_width))
vl_fifo_1r1w_async_a (
    .d(a_d), .wr(a_wr), .fifo_full(a_fifo_full), .wr_clk(a_clk), .wr_rst(a_rst),
    .q(b_q), .rd(b_rd), .fifo_empty(b_fifo_empty), .rd_clk(b_clk), .rd_rst(b_rst)
    );
vl_fifo_1r1w_async # (.data_width(data_width), .addr_width(addr_width))
vl_fifo_1r1w_async_b (
    .d(b_d), .wr(b_wr), .fifo_full(b_fifo_full), .wr_clk(b_clk), .wr_rst(b_rst),
    .q(a_q), .rd(a_rd), .fifo_empty(a_fifo_empty), .rd_clk(a_clk), .rd_rst(a_rst)
    );
endmodule
module vl_fifo_2r2w_async_simplex (
    // a side
    a_d, a_wr, a_fifo_full,
    a_q, a_rd, a_fifo_empty,
    a_clk, a_rst,
    // b side
    b_d, b_wr, b_fifo_full,
    b_q, b_rd, b_fifo_empty,
    b_clk, b_rst
    );
parameter data_width = 18;
parameter addr_width = 4;
// a side
input  [data_width-1:0] a_d;
input                   a_wr;
output                  a_fifo_full;
output [data_width-1:0] a_q;
input                   a_rd;
output                  a_fifo_empty;
input                   a_clk;
input                   a_rst;
// b side
input  [data_width-1:0] b_d;
input                   b_wr;
output                  b_fifo_full;
output [data_width-1:0] b_q;
input                   b_rd;
output                  b_fifo_empty;
input                   b_clk;
input                   b_rst;
// adr_gen
wire [addr_width:1] a_wadr, a_wadr_bin, a_radr, a_radr_bin;
wire [addr_width:1] b_wadr, b_wadr_bin, b_radr, b_radr_bin;
// dpram
wire [addr_width:0] a_dpram_adr, b_dpram_adr;
vl_cnt_gray_ce_bin
    # ( .length(addr_width))
    fifo_a_wr_adr( .cke(a_wr), .q(a_wadr), .q_bin(a_wadr_bin), .rst(a_rst), .clk(a_clk));
vl_cnt_gray_ce_bin
    # (.length(addr_width))
    fifo_a_rd_adr( .cke(a_rd), .q(a_radr), .q_bin(a_radr_bin), .rst(a_rst), .clk(a_clk));
vl_cnt_gray_ce_bin
    # ( .length(addr_width))
    fifo_b_wr_adr( .cke(b_wr), .q(b_wadr), .q_bin(b_wadr_bin), .rst(b_rst), .clk(b_clk));
vl_cnt_gray_ce_bin
    # (.length(addr_width))
    fifo_b_rd_adr( .cke(b_rd), .q(b_radr), .q_bin(b_radr_bin), .rst(b_rst), .clk(b_clk));
// mux read or write adr to DPRAM
assign a_dpram_adr = (a_wr) ? {1'b0,a_wadr_bin} : {1'b1,a_radr_bin};
assign b_dpram_adr = (b_wr) ? {1'b1,b_wadr_bin} : {1'b0,b_radr_bin};
vl_dpram_2r2w
    # (.data_width(data_width), .addr_width(addr_width+1))
    dpram ( .d_a(a_d), .q_a(a_q), .adr_a(a_dpram_adr), .we_a(a_wr), .clk_a(a_clk),
            .d_b(b_d), .q_b(b_q), .adr_b(b_dpram_adr), .we_b(b_wr), .clk_b(b_clk));
vl_fifo_cmp_async
    # (.addr_width(addr_width))
    cmp1 ( .wptr(a_wadr), .rptr(b_radr), .fifo_empty(b_fifo_empty), .fifo_full(a_fifo_full), .wclk(a_clk), .rclk(b_clk), .rst(a_rst) );
vl_fifo_cmp_async
    # (.addr_width(addr_width))
    cmp2 ( .wptr(b_wadr), .rptr(a_radr), .fifo_empty(a_fifo_empty), .fifo_full(b_fifo_full), .wclk(b_clk), .rclk(a_clk), .rst(b_rst) );
endmodule
module vl_reg_file (
    a1, a2, a3, wd3, we3, rd1, rd2, clk
);
parameter data_width = 32;
parameter addr_width = 5;
input [addr_width-1:0] a1, a2, a3;
input [data_width-1:0] wd3;
input we3;
output [data_width-1:0] rd1, rd2;
input clk;
reg [data_width-1:0] wd3_reg;
reg [addr_width-1:0] a1_reg, a2_reg, a3_reg;
reg we3_reg;
reg [data_width-1:0] ram1 [(1<<addr_width)-1:0] /*synthesis syn_ramstyle = "no_rw_check"*/;
reg [data_width-1:0] ram2 [(1<<addr_width)-1:0] /*synthesis syn_ramstyle = "no_rw_check"*/;
always @ (posedge clk or posedge rst)
if (rst)
    {wd3_reg, a3_reg, we3_reg} <= {(data_width+addr_width+1){1'b0}};
else
    {wd3_reg, a3_reg, we3_reg} <= {wd3,a3,wd3};
    always @ (negedge clk)
    if (we3_reg)
        ram1[a3_reg] <= wd3;
    always @ (posedge clk)
        a1_reg <= a1;
    assign rd1 = ram1[a1_reg];
    always @ (negedge clk)
    if (we3_reg)
        ram2[a3_reg] <= wd3;
    always @ (posedge clk)
        a2_reg <= a2;
    assign rd2 = ram2[a2_reg];
endmodule
//////////////////////////////////////////////////////////////////////
////                                                              ////
////  Versatile library, wishbone stuff                           ////
////                                                              ////
////  Description                                                 ////
////  Wishbone compliant modules                                  ////
////                                                              ////
////                                                              ////
////  To Do:                                                      ////
////   -                                                          ////
////                                                              ////
////  Author(s):                                                  ////
////      - Michael Unneback, unneback@opencores.org              ////
////        ORSoC AB                                              ////
////                                                              ////
//////////////////////////////////////////////////////////////////////
////                                                              ////
//// Copyright (C) 2010 Authors and OPENCORES.ORG                 ////
////                                                              ////
//// This source file may be used and distributed without         ////
//// restriction provided that this copyright statement is not    ////
//// removed from the file and that any derivative work contains  ////
//// the original copyright notice and the associated disclaimer. ////
////                                                              ////
//// This source file is free software; you can redistribute it   ////
//// and/or modify it under the terms of the GNU Lesser General   ////
//// Public License as published by the Free Software Foundation; ////
//// either version 2.1 of the License, or (at your option) any   ////
//// later version.                                               ////
////                                                              ////
//// This source is distributed in the hope that it will be       ////
//// useful, but WITHOUT ANY WARRANTY; without even the implied   ////
//// warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR      ////
//// PURPOSE.  See the GNU Lesser General Public License for more ////
//// details.                                                     ////
////                                                              ////
//// You should have received a copy of the GNU Lesser General    ////
//// Public License along with this source; if not, download it   ////
//// from http://www.opencores.org/lgpl.shtml                     ////
////                                                              ////
//////////////////////////////////////////////////////////////////////
`timescale 1ns/1ns
module vl_wb_adr_inc ( cyc_i, stb_i, cti_i, bte_i, adr_i, we_i, ack_o, adr_o, clk, rst);
parameter adr_width = 10;
parameter max_burst_width = 4;
input cyc_i, stb_i, we_i;
input [2:0] cti_i;
input [1:0] bte_i;
input [adr_width-1:0] adr_i;
output [adr_width-1:0] adr_o;
output ack_o;
input clk, rst;
reg [adr_width-1:0] adr;
wire [max_burst_width-1:0] to_adr;
reg [max_burst_width-1:0] last_adr;
reg last_cycle;
localparam idle_or_eoc = 1'b0;
localparam cyc_or_ws   = 1'b1;
always @ (posedge clk or posedge rst)
if (rst)
    last_adr <= {max_burst_width{1'b0}};
else
    if (stb_i)
        last_adr <=adr_o[max_burst_width-1:0];
generate
if (max_burst_width==0) begin : inst_0
        reg ack_o;
        assign adr_o = adr_i;
        always @ (posedge clk or posedge rst)
        if (rst)
            ack_o <= 1'b0;
        else
            ack_o <= cyc_i & stb_i & !ack_o;
end else begin
    always @ (posedge clk or posedge rst)
    if (rst)
        last_cycle <= idle_or_eoc;
    else
        last_cycle <= (!cyc_i) ? idle_or_eoc : //idle
                      (cyc_i & ack_o & (cti_i==3'b000 | cti_i==3'b111)) ? idle_or_eoc : // eoc
                      (cyc_i & !stb_i) ? cyc_or_ws : //ws
                      cyc_or_ws; // cyc
    assign to_adr = (last_cycle==idle_or_eoc) ? adr_i[max_burst_width-1:0] : adr[max_burst_width-1:0];
    assign adr_o[max_burst_width-1:0] = (we_i) ? adr_i[max_burst_width-1:0] :
                                        (!stb_i) ? last_adr :
                                        (last_cycle==idle_or_eoc) ? adr_i[max_burst_width-1:0] :
                                        adr[max_burst_width-1:0];
    assign ack_o = (last_cycle==cyc_or_ws) & stb_i;
end
endgenerate
generate
if (max_burst_width==2) begin : inst_2
    always @ (posedge clk or posedge rst)
    if (rst)
        adr <= 2'h0;
    else
        if (cyc_i & stb_i)
            adr[1:0] <= to_adr[1:0] + 2'd1;
        else
            adr <= to_adr[1:0];
end
endgenerate
generate
if (max_burst_width==3) begin : inst_3
    always @ (posedge clk or posedge rst)
    if (rst)
        adr <= 3'h0;
    else
        if (cyc_i & stb_i)
            case (bte_i)
            2'b01: adr[2:0] <= {to_adr[2],to_adr[1:0] + 2'd1};
            default: adr[3:0] <= to_adr[2:0] + 3'd1;
            endcase
        else
            adr <= to_adr&

Line No.	Rev	Author	Line
1	60	unneback	`// default SYN_KEEP definition`
2	98	unneback	`// ACTEL FPGA should not use logic to handle rw collision`
3	136	unneback	`///////////////////////////////////////`
4			`// dependencies`
5			`///////////////////////////////////////`
6	97	unneback	`// size to width`
7	6	unneback	`//////////////////////////////////////////////////////////////////////`
8			`//// ////`
9			`//// Versatile library, clock and reset ////`
10			`//// ////`
11			`//// Description ////`
12			`//// Logic related to clock and reset ////`
13			`//// ////`
14			`//// ////`
15			`//// To Do: ////`
16			`//// - add more different registers ////`
17			`//// ////`
18			`//// Author(s): ////`
19			`//// - Michael Unneback, unneback@opencores.org ////`
20			`//// ORSoC AB ////`
21			`//// ////`
22			`//////////////////////////////////////////////////////////////////////`
23			`//// ////`
24			`//// Copyright (C) 2010 Authors and OPENCORES.ORG ////`
25			`//// ////`
26			`//// This source file may be used and distributed without ////`
27			`//// restriction provided that this copyright statement is not ////`
28			`//// removed from the file and that any derivative work contains ////`
29			`//// the original copyright notice and the associated disclaimer. ////`
30			`//// ////`
31			`//// This source file is free software; you can redistribute it ////`
32			`//// and/or modify it under the terms of the GNU Lesser General ////`
33			`//// Public License as published by the Free Software Foundation; ////`
34			`//// either version 2.1 of the License, or (at your option) any ////`
35			`//// later version. ////`
36			`//// ////`
37			`//// This source is distributed in the hope that it will be ////`
38			`//// useful, but WITHOUT ANY WARRANTY; without even the implied ////`
39			`//// warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR ////`
40			`//// PURPOSE. See the GNU Lesser General Public License for more ////`
41			`//// details. ////`
42			`//// ////`
43			`//// You should have received a copy of the GNU Lesser General ////`
44			`//// Public License along with this source; if not, download it ////`
45			`//// from http://www.opencores.org/lgpl.shtml ////`
46			`//// ////`
47			`//////////////////////////////////////////////////////////////////////`
48	48	unneback	`timescale 1 ns/100 ps
49	6	unneback	`// Global buffer`
50			`// usage:`
51			`// use to enable global buffers for high fan out signals such as clock and reset`
52			`// Version: 8.4 8.4.0.33`
53			`module gbuf(GL,CLK);`
54			`output GL;`
55			`input CLK;`
56			`wire GND;`
57			`GND GND_1_net(.Y(GND));`
58			`CLKDLY Inst1(.CLK(CLK), .GL(GL), .DLYGL0(GND), .DLYGL1(GND),`
59			`.DLYGL2(GND), .DLYGL3(GND), .DLYGL4(GND)) /* synthesis black_box */;`
60			`endmodule`
61			`timescale 1 ns/1 ns
62			`module vl_gbuf ( i, o);`
63			`input i;`
64			`output o;`
65			`ifdef SIM_GBUF
66			`assign o=i;`
67			`else
68			`gbuf gbuf_i0 ( .CLK(i), .GL(o));`
69			`endif
70			`endmodule`
71			`//ACTEL`
72			`// sync reset`
73	17	unneback	`// input active lo async reset, normally from external reset generator and/or switch`
74	6	unneback	`// output active high global reset sync with two DFFs`
75			`timescale 1 ns/100 ps
76			`module vl_sync_rst ( rst_n_i, rst_o, clk);`
77			`input rst_n_i, clk;`
78			`output rst_o;`
79	18	unneback	`reg [1:0] tmp;`
80	6	unneback	`always @ (posedge clk or negedge rst_n_i)`
81			`if (!rst_n_i)`
82	17	unneback	`tmp <= 2'b11;`
83	6	unneback	`else`
84	33	unneback	`tmp <= {1'b0,tmp[1]};`
85	17	unneback	`vl_gbuf buf_i0( .i(tmp[0]), .o(rst_o));`
86	6	unneback	`endmodule`
87			`// vl_pll`
88	32	unneback	`///////////////////////////////////////////////////////////////////////////////`
89	17	unneback	`timescale 1 ps/1 ps
90	6	unneback	`module vl_pll ( clk_i, rst_n_i, lock, clk_o, rst_o);`
91			`parameter index = 0;`
92			`parameter number_of_clk = 1;`
93	17	unneback	`parameter period_time_0 = 20000;`
94			`parameter period_time_1 = 20000;`
95			`parameter period_time_2 = 20000;`
96			`parameter lock_delay = 2000000;`
97	6	unneback	`input clk_i, rst_n_i;`
98			`output lock;`
99			`output reg [0:number_of_clk-1] clk_o;`
100			`output [0:number_of_clk-1] rst_o;`
101			`ifdef SIM_PLL
102			`always`
103			`#((period_time_0)/2) clk_o[0] <= (!rst_n_i) ? 0 : ~clk_o[0];`
104			`generate if (number_of_clk > 1)`
105			`always`
106			`#((period_time_1)/2) clk_o[1] <= (!rst_n_i) ? 0 : ~clk_o[1];`
107			`endgenerate`
108			`generate if (number_of_clk > 2)`
109			`always`
110			`#((period_time_2)/2) clk_o[2] <= (!rst_n_i) ? 0 : ~clk_o[2];`
111			`endgenerate`
112			`genvar i;`
113			`generate for (i=0;i<number_of_clk;i=i+1) begin: clock`
114			`vl_sync_rst rst_i0 ( .rst_n_i(rst_n_i \| lock), .rst_o(rst_o[i]), .clk(clk_o[i]));`
115			`end`
116			`endgenerate`
117			`assign #lock_delay lock = rst_n_i;`
118			`endmodule`
119			`else
120			`generate if (number_of_clk==1 & index==0) begin`
121			`pll0 pll_i0 (.POWERDOWN(1'b1), .CLKA(clk_i), .LOCK(lock), .GLA(clk_o[0]));`
122			`end`
123			`endgenerate // index==0`
124			`generate if (number_of_clk==1 & index==1) begin`
125			`pll1 pll_i0 (.POWERDOWN(1'b1), .CLKA(clk_i), .LOCK(lock), .GLA(clk_o[0]));`
126			`end`
127			`endgenerate // index==1`
128			`generate if (number_of_clk==1 & index==2) begin`
129			`pll2 pll_i0 (.POWERDOWN(1'b1), .CLKA(clk_i), .LOCK(lock), .GLA(clk_o[0]));`
130			`end`
131			`endgenerate // index==2`
132			`generate if (number_of_clk==1 & index==3) begin`
133			`pll3 pll_i0 (.POWERDOWN(1'b1), .CLKA(clk_i), .LOCK(lock), .GLA(clk_o[0]));`
134			`end`
135			`endgenerate // index==0`
136			`generate if (number_of_clk==2 & index==0) begin`
137			`pll0 pll_i0 (.POWERDOWN(1'b1), .CLKA(clk_i), .LOCK(lock), .GLA(clk_o[0]), .GLB(clk_o[1]));`
138			`end`
139			`endgenerate // index==0`
140			`generate if (number_of_clk==2 & index==1) begin`
141			`pll1 pll_i0 (.POWERDOWN(1'b1), .CLKA(clk_i), .LOCK(lock), .GLA(clk_o[0]), .GLB(clk_o[1]));`
142			`end`
143			`endgenerate // index==1`
144			`generate if (number_of_clk==2 & index==2) begin`
145			`pll2 pll_i0 (.POWERDOWN(1'b1), .CLKA(clk_i), .LOCK(lock), .GLA(clk_o[0]), .GLB(clk_o[1]));`
146			`end`
147			`endgenerate // index==2`
148			`generate if (number_of_clk==2 & index==3) begin`
149			`pll3 pll_i0 (.POWERDOWN(1'b1), .CLKA(clk_i), .LOCK(lock), .GLA(clk_o[0]), .GLB(clk_o[1]));`
150			`end`
151			`endgenerate // index==0`
152			`generate if (number_of_clk==3 & index==0) begin`
153			`pll0 pll_i0 (.POWERDOWN(1'b1), .CLKA(clk_i), .LOCK(lock), .GLA(clk_o[0]), .GLB(clk_o[1]), .GLC(clk_o[2]));`
154			`end`
155			`endgenerate // index==0`
156			`generate if (number_of_clk==3 & index==1) begin`
157			`pll1 pll_i0 (.POWERDOWN(1'b1), .CLKA(clk_i), .LOCK(lock), .GLA(clk_o[0]), .GLB(clk_o[1]), .GLC(clk_o[2]));`
158			`end`
159			`endgenerate // index==1`
160			`generate if (number_of_clk==3 & index==2) begin`
161			`pll2 pll_i0 (.POWERDOWN(1'b1), .CLKA(clk_i), .LOCK(lock), .GLA(clk_o[0]), .GLB(clk_o[1]), .GLC(clk_o[2]));`
162			`end`
163			`endgenerate // index==2`
164			`generate if (number_of_clk==3 & index==3) begin`
165			`pll3 pll_i0 (.POWERDOWN(1'b1), .CLKA(clk_i), .LOCK(lock), .GLA(clk_o[0]), .GLB(clk_o[1]), .GLC(clk_o[2]));`
166			`end`
167			`endgenerate // index==0`
168			`genvar i;`
169			`generate for (i=0;i<number_of_clk;i=i+1) begin: clock`
170	40	unneback	`vl_sync_rst rst_i0 ( .rst_n_i(rst_n_i \| lock), .rst_o(rst_o), .clk(clk_o[i]));`
171	6	unneback	`end`
172			`endgenerate`
173			`endmodule`
174			`endif
175	32	unneback	`///////////////////////////////////////////////////////////////////////////////`
176	6	unneback	`//actel`
177			`//////////////////////////////////////////////////////////////////////`
178			`//// ////`
179			`//// Versatile library, registers ////`
180			`//// ////`
181			`//// Description ////`
182			`//// Different type of registers ////`
183			`//// ////`
184			`//// ////`
185			`//// To Do: ////`
186			`//// - add more different registers ////`
187			`//// ////`
188			`//// Author(s): ////`
189			`//// - Michael Unneback, unneback@opencores.org ////`
190			`//// ORSoC AB ////`
191			`//// ////`
192			`//////////////////////////////////////////////////////////////////////`
193			`//// ////`
194			`//// Copyright (C) 2010 Authors and OPENCORES.ORG ////`
195			`//// ////`
196			`//// This source file may be used and distributed without ////`
197			`//// restriction provided that this copyright statement is not ////`
198			`//// removed from the file and that any derivative work contains ////`
199			`//// the original copyright notice and the associated disclaimer. ////`
200			`//// ////`
201			`//// This source file is free software; you can redistribute it ////`
202			`//// and/or modify it under the terms of the GNU Lesser General ////`
203			`//// Public License as published by the Free Software Foundation; ////`
204			`//// either version 2.1 of the License, or (at your option) any ////`
205			`//// later version. ////`
206			`//// ////`
207			`//// This source is distributed in the hope that it will be ////`
208			`//// useful, but WITHOUT ANY WARRANTY; without even the implied ////`
209			`//// warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR ////`
210			`//// PURPOSE. See the GNU Lesser General Public License for more ////`
211			`//// details. ////`
212			`//// ////`
213			`//// You should have received a copy of the GNU Lesser General ////`
214			`//// Public License along with this source; if not, download it ////`
215			`//// from http://www.opencores.org/lgpl.shtml ////`
216			`//// ////`
217			`//////////////////////////////////////////////////////////////////////`
218	18	unneback	`module vl_dff ( d, q, clk, rst);`
219	6	unneback	`parameter width = 1;`
220			`parameter reset_value = 0;`
221			`input [width-1:0] d;`
222			`input clk, rst;`
223			`output reg [width-1:0] q;`
224			`always @ (posedge clk or posedge rst)`
225			`if (rst)`
226			`q <= reset_value;`
227			`else`
228			`q <= d;`
229			`endmodule`
230	18	unneback	`module vl_dff_array ( d, q, clk, rst);`
231	6	unneback	`parameter width = 1;`
232			`parameter depth = 2;`
233			`parameter reset_value = 1'b0;`
234			`input [width-1:0] d;`
235			`input clk, rst;`
236			`output [width-1:0] q;`
237			`reg [0:depth-1] q_tmp [width-1:0];`
238			`integer i;`
239			`always @ (posedge clk or posedge rst)`
240			`if (rst) begin`
241			`for (i=0;i<depth;i=i+1)`
242			`q_tmp[i] <= {width{reset_value}};`
243			`end else begin`
244			`q_tmp[0] <= d;`
245			`for (i=1;i<depth;i=i+1)`
246			`q_tmp[i] <= q_tmp[i-1];`
247			`end`
248			`assign q = q_tmp[depth-1];`
249			`endmodule`
250	18	unneback	`module vl_dff_ce ( d, ce, q, clk, rst);`
251	6	unneback	`parameter width = 1;`
252			`parameter reset_value = 0;`
253			`input [width-1:0] d;`
254			`input ce, clk, rst;`
255			`output reg [width-1:0] q;`
256			`always @ (posedge clk or posedge rst)`
257			`if (rst)`
258			`q <= reset_value;`
259			`else`
260			`if (ce)`
261			`q <= d;`
262			`endmodule`
263	18	unneback	`module vl_dff_ce_clear ( d, ce, clear, q, clk, rst);`
264	8	unneback	`parameter width = 1;`
265			`parameter reset_value = 0;`
266			`input [width-1:0] d;`
267	10	unneback	`input ce, clear, clk, rst;`
268	8	unneback	`output reg [width-1:0] q;`
269			`always @ (posedge clk or posedge rst)`
270			`if (rst)`
271			`q <= reset_value;`
272			`else`
273			`if (ce)`
274			`if (clear)`
275			`q <= {width{1'b0}};`
276			`else`
277			`q <= d;`
278			`endmodule`
279	24	unneback	`module vl_dff_ce_set ( d, ce, set, q, clk, rst);`
280			`parameter width = 1;`
281			`parameter reset_value = 0;`
282			`input [width-1:0] d;`
283			`input ce, set, clk, rst;`
284			`output reg [width-1:0] q;`
285			`always @ (posedge clk or posedge rst)`
286			`if (rst)`
287			`q <= reset_value;`
288			`else`
289			`if (ce)`
290			`if (set)`
291			`q <= {width{1'b1}};`
292			`else`
293			`q <= d;`
294			`endmodule`
295	29	unneback	`module vl_spr ( sp, r, q, clk, rst);`
296	64	unneback	`//parameter width = 1;`
297			`parameter reset_value = 1'b0;`
298	29	unneback	`input sp, r;`
299			`output reg q;`
300			`input clk, rst;`
301			`always @ (posedge clk or posedge rst)`
302			`if (rst)`
303			`q <= reset_value;`
304			`else`
305			`if (sp)`
306			`q <= 1'b1;`
307			`else if (r)`
308			`q <= 1'b0;`
309			`endmodule`
310			`module vl_srp ( s, rp, q, clk, rst);`
311			`parameter width = 1;`
312			`parameter reset_value = 0;`
313			`input s, rp;`
314			`output reg q;`
315			`input clk, rst;`
316			`always @ (posedge clk or posedge rst)`
317			`if (rst)`
318			`q <= reset_value;`
319			`else`
320			`if (rp)`
321			`q <= 1'b0;`
322			`else if (s)`
323			`q <= 1'b1;`
324			`endmodule`
325	18	unneback	`module vl_dff_sr ( aclr, aset, clock, data, q);`
326	6	unneback	`input aclr;`
327			`input aset;`
328			`input clock;`
329			`input data;`
330			`output reg q;`
331			`always @ (posedge clock or posedge aclr or posedge aset)`
332			`if (aclr)`
333			`q <= 1'b0;`
334			`else if (aset)`
335			`q <= 1'b1;`
336			`else`
337			`q <= data;`
338			`endmodule`
339			`// LATCH`
340			`// For targtes not supporting LATCH use dff_sr with clk=1 and data=1`
341	40	unneback	`module vl_latch ( d, le, q, clk);`
342	6	unneback	`input d, le;`
343	48	unneback	`input clk;`
344			`always @ (le or d)`
345	60	unneback	`if (le)`
346	48	unneback	`d <= q;`
347	6	unneback	`endmodule`
348	18	unneback	`module vl_shreg ( d, q, clk, rst);`
349	17	unneback	`parameter depth = 10;`
350			`input d;`
351			`output q;`
352			`input clk, rst;`
353			`reg [1:depth] dffs;`
354			`always @ (posedge clk or posedge rst)`
355			`if (rst)`
356			`dffs <= {depth{1'b0}};`
357			`else`
358			`dffs <= {d,dffs[1:depth-1]};`
359			`assign q = dffs[depth];`
360			`endmodule`
361	18	unneback	`module vl_shreg_ce ( d, ce, q, clk, rst);`
362	17	unneback	`parameter depth = 10;`
363			`input d, ce;`
364			`output q;`
365			`input clk, rst;`
366			`reg [1:depth] dffs;`
367			`always @ (posedge clk or posedge rst)`
368			`if (rst)`
369			`dffs <= {depth{1'b0}};`
370			`else`
371			`if (ce)`
372			`dffs <= {d,dffs[1:depth-1]};`
373			`assign q = dffs[depth];`
374			`endmodule`
375	18	unneback	`module vl_delay ( d, q, clk, rst);`
376	15	unneback	`parameter depth = 10;`
377			`input d;`
378			`output q;`
379			`input clk, rst;`
380			`reg [1:depth] dffs;`
381			`always @ (posedge clk or posedge rst)`
382			`if (rst)`
383			`dffs <= {depth{1'b0}};`
384			`else`
385			`dffs <= {d,dffs[1:depth-1]};`
386			`assign q = dffs[depth];`
387			`endmodule`
388	18	unneback	`module vl_delay_emptyflag ( d, q, emptyflag, clk, rst);`
389	17	unneback	`parameter depth = 10;`
390			`input d;`
391			`output q, emptyflag;`
392			`input clk, rst;`
393			`reg [1:depth] dffs;`
394			`always @ (posedge clk or posedge rst)`
395			`if (rst)`
396			`dffs <= {depth{1'b0}};`
397			`else`
398			`dffs <= {d,dffs[1:depth-1]};`
399			`assign q = dffs[depth];`
400			`assign emptyflag = !(\|dffs);`
401			`endmodule`
402	98	unneback	`module vl_pulse2toggle ( pl, q, clk, rst);`
403	94	unneback	`input pl;`
404	98	unneback	`output reg q;`
405	94	unneback	`input clk, rst;`
406			`always @ (posedge clk or posedge rst)`
407			`if (rst)`
408			`q <= 1'b0;`
409			`else`
410			`q <= pl ^ q;`
411			`endmodule`
412	98	unneback	`module vl_toggle2pulse (d, pl, clk, rst);`
413	94	unneback	`input d;`
414			`output pl;`
415			`input clk, rst;`
416			`reg dff;`
417			`always @ (posedge clk or posedge rst)`
418			`if (rst)`
419			`dff <= 1'b0;`
420			`else`
421			`dff <= d;`
422	98	unneback	`assign pl = d ^ dff;`
423	94	unneback	`endmodule`
424			`module vl_synchronizer (d, q, clk, rst);`
425			`input d;`
426			`output reg q;`
427	116	unneback	`input clk, rst;`
428	94	unneback	`reg dff;`
429			`always @ (posedge clk or posedge rst)`
430			`if (rst)`
431	100	unneback	`{q,dff} <= 2'b00;`
432	94	unneback	`else`
433	100	unneback	`{q,dff} <= {dff,d};`
434	94	unneback	`endmodule`
435	97	unneback	`module vl_cdc ( start_pl, take_it_pl, take_it_grant_pl, got_it_pl, clk_src, rst_src, clk_dst, rst_dst);`
436	94	unneback	`input start_pl;`
437			`output take_it_pl;`
438			`input take_it_grant_pl; // note: connect to take_it_pl to generate automatic ack`
439			`output got_it_pl;`
440			`input clk_src, rst_src;`
441			`input clk_dst, rst_dst;`
442			`wire take_it_tg, take_it_tg_sync;`
443			`wire got_it_tg, got_it_tg_sync;`
444			`// src -> dst`
445			`vl_pulse2toggle p2t0 (`
446			`.pl(start_pl),`
447			`.q(take_it_tg),`
448			`.clk(clk_src),`
449			`.rst(rst_src));`
450			`vl_synchronizer sync0 (`
451			`.d(take_it_tg),`
452			`.q(take_it_tg_sync),`
453			`.clk(clk_dst),`
454			`.rst(rst_dst));`
455			`vl_toggle2pulse t2p0 (`
456	100	unneback	`.d(take_it_tg_sync),`
457	94	unneback	`.pl(take_it_pl),`
458			`.clk(clk_dst),`
459			`.rst(rst_dst));`
460			`// dst -> src`
461	98	unneback	`vl_pulse2toggle p2t1 (`
462	94	unneback	`.pl(take_it_grant_pl),`
463			`.q(got_it_tg),`
464			`.clk(clk_dst),`
465			`.rst(rst_dst));`
466			`vl_synchronizer sync1 (`
467			`.d(got_it_tg),`
468			`.q(got_it_tg_sync),`
469			`.clk(clk_src),`
470			`.rst(rst_src));`
471			`vl_toggle2pulse t2p1 (`
472	100	unneback	`.d(got_it_tg_sync),`
473	94	unneback	`.pl(got_it_pl),`
474			`.clk(clk_src),`
475			`.rst(rst_src));`
476			`endmodule`
477	6	unneback	`//////////////////////////////////////////////////////////////////////`
478			`//// ////`
479	18	unneback	`//// Logic functions ////`
480			`//// ////`
481			`//// Description ////`
482			`//// Logic functions such as multiplexers ////`
483			`//// ////`
484			`//// ////`
485			`//// To Do: ////`
486			`//// - ////`
487			`//// ////`
488			`//// Author(s): ////`
489			`//// - Michael Unneback, unneback@opencores.org ////`
490			`//// ORSoC AB ////`
491			`//// ////`
492			`//////////////////////////////////////////////////////////////////////`
493			`//// ////`
494			`//// Copyright (C) 2010 Authors and OPENCORES.ORG ////`
495			`//// ////`
496			`//// This source file may be used and distributed without ////`
497			`//// restriction provided that this copyright statement is not ////`
498			`//// removed from the file and that any derivative work contains ////`
499			`//// the original copyright notice and the associated disclaimer. ////`
500			`//// ////`

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