| Line 1... |
Line 1... |
// $Id: aeMB_ibuf.v,v 1.1 2007-11-02 03:25:40 sybreon Exp $
|
// $Id: aeMB_ibuf.v,v 1.2 2007-11-02 19:20:58 sybreon Exp $
|
//
|
//
|
// AEMB INSTRUCTION BUFFER
|
// AEMB INSTRUCTION BUFFER
|
//
|
//
|
// Copyright (C) 2004-2007 Shawn Tan Ser Ngiap <shawn.tan@aeste.net>
|
// Copyright (C) 2004-2007 Shawn Tan Ser Ngiap <shawn.tan@aeste.net>
|
//
|
//
|
| Line 18... |
Line 18... |
// License along with this library; if not, write to the Free Software
|
// License along with this library; if not, write to the Free Software
|
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
|
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
|
// USA
|
// USA
|
//
|
//
|
// $Log: not supported by cvs2svn $
|
// $Log: not supported by cvs2svn $
|
|
// Revision 1.1 2007/11/02 03:25:40 sybreon
|
|
// New EDK 3.2 compatible design with optional barrel-shifter and multiplier.
|
|
// Fixed various minor data hazard bugs.
|
|
// Code compatible with -O0/1/2/3/s generated code.
|
|
//
|
|
|
module aeMB_ibuf (/*AUTOARG*/
|
module aeMB_ibuf (/*AUTOARG*/
|
// Outputs
|
// Outputs
|
rIMM, rRA, rRD, rRB, rALT, rOPC, rSIMM, iwb_stb_o,
|
rIMM, rRA, rRD, rRB, rALT, rOPC, rSIMM, iwb_stb_o,
|
// Inputs
|
// Inputs
|
| Line 54... |
Line 59... |
|
|
// TODO: Assign to FIFO not full.
|
// TODO: Assign to FIFO not full.
|
assign iwb_stb_o = 1'b1;
|
assign iwb_stb_o = 1'b1;
|
|
|
reg [31:0] rSIMM, xSIMM;
|
reg [31:0] rSIMM, xSIMM;
|
wire [31:0] wSIMM = (fIMM) ? {rIMM, wIDAT[15:0]} : { {(16){wIDAT[15]}}, wIDAT[15:0]}; // TODO: Factor
|
|
wire fIMM = (rOPC == 6'o54);
|
wire fIMM = (rOPC == 6'o54);
|
|
|
reg [31:0] xIREG;
|
reg [31:0] xIREG;
|
|
|
// DELAY SLOT
|
// DELAY SLOT
|
always @(/*AUTOSENSE*/rBRA or wIDAT)
|
always @(/*AUTOSENSE*/fIMM or rBRA or rIMM or rXCE or wIDAT) begin
|
if (rBRA) begin
|
xIREG <= (rBRA | |rXCE) ? 32'h88000000 : wIDAT;
|
xIREG <= 32'h88000000;
|
xSIMM <= (fIMM) ? {rIMM, wIDAT[15:0]} : { {(16){wIDAT[15]}}, wIDAT[15:0]};
|
/*AUTORESET*/
|
|
end else begin
|
|
xIREG <= wIDAT; // FIXME: Simplify
|
|
//xSIMM <= wSIMM;
|
|
end
|
|
|
|
always @(/*AUTOSENSE*/fIMM or rBRA or rIMM or xIREG)
|
|
if (rBRA) begin
|
|
/*AUTORESET*/
|
|
// Beginning of autoreset for uninitialized flops
|
|
xSIMM <= 32'h0;
|
|
// End of automatics
|
|
end else begin
|
|
//xIREG <= wIDAT; // FIXME: Simplify
|
|
xSIMM <= (fIMM) ? {rIMM, xIREG[15:0]} : { {(16){xIREG[15]}}, xIREG[15:0]}; // TODO: Factor
|
|
end
|
end
|
|
|
// Synchronous
|
// Synchronous
|
always @(posedge gclk)
|
always @(posedge gclk)
|
if (grst) begin
|
if (grst) begin
|
