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[/] [aemb/] [tags/] [AEMB_7_05/] [rtl/] [verilog/] [aeMB_fetch.v] - Blame information for rev 14

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//                              -*- Mode: Verilog -*-
// Filename        : aeMB_fetch.v
// Description     : AEMB Programme Counter
// Author          : Shawn Tan Ser Ngiap <shawn.tan@aeste.net>
// Created On      : Sat Dec 30 04:34:44 2006
// Last Modified By: $Author: sybreon $
// Last Modified On: $Date: 2007-04-04 14:08:34 $
// Update Count    : $Revision: 1.2 $
// Status          : $State: Exp $
 
/*
 * $Id: aeMB_fetch.v,v 1.2 2007-04-04 14:08:34 sybreon Exp $
 *
 * AEMB Instruction Fetch
 * Copyright (C) 2006 Shawn Tan Ser Ngiap <shawn.tan@aeste.net>
 *
 * This library 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 library 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 library; if not, write to the Free Software Foundation, Inc.,
 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 *
 * DESCRIPTION
 * Controls the instruction side of AEMB.
 *
 * HISTORY
 * $Log: not supported by cvs2svn $
 * Revision 1.1  2007/03/09 17:52:17  sybreon
 * initial import
 *
 */
 
module aeMB_fetch (/*AUTOARG*/
   // Outputs
   iwb_adr_o, rPC, rPCNXT,
   // Inputs
   iwb_dat_i, nclk, nrst, frun, rFSM, rBRA, rRESULT
   );
   parameter ISIZ = 32;
 
   // Instruction WB I/F
   output [ISIZ-1:0] iwb_adr_o;
   input [31:0]      iwb_dat_i;
 
   // System
   input             nclk, nrst, frun;
 
   // Internal
   output [31:0]     rPC;
   output [31:0]     rPCNXT;
   input [1:0]        rFSM;
   input             rBRA;
   input [31:0]      rRESULT;
 
   // WB ADR signal
   reg [31:0]         rIWBADR, rPC;
   assign            rPCNXT = rIWBADR + 4;
   assign            iwb_adr_o = {rIWBADR[ISIZ-1:2],2'b00}; // Word Aligned
 
   always @(negedge nclk or negedge nrst)
     if (!nrst) begin
        /*AUTORESET*/
        // Beginning of autoreset for uninitialized flops
        rIWBADR <= 32'h0;
        rPC <= 32'h0;
        // End of automatics
     end else begin
        // PC Sources - ALU, Direct, Next
        case (rFSM)
          2'b01: rIWBADR <= #1 32'h00000010; // HWINT
          2'b10: rIWBADR <= #1 32'h00000020; // HWEXC
          //2'b11: rIWBADR <= #1 32'h00000008; // SWEXC
          default: rIWBADR <= #1 (rBRA) ? rRESULT : rPCNXT;
        endcase // case(rFSM)
 
        rPC <= #1 {rIWBADR[31:2],2'd0};
     end // if (frun)
 
 
endmodule // aeMB_fetch
 

Line No.	Rev	Author	Line
1	3	sybreon	`// -- Mode: Verilog --`
2			`// Filename : aeMB_fetch.v`
3			`// Description : AEMB Programme Counter`
4			`// Author : Shawn Tan Ser Ngiap <shawn.tan@aeste.net>`
5			`// Created On : Sat Dec 30 04:34:44 2006`
6	14	sybreon	`// Last Modified By: $Author: sybreon $`
7			`// Last Modified On: $Date: 2007-04-04 14:08:34 $`
8			`// Update Count : $Revision: 1.2 $`
9			`// Status : $State: Exp $`
10	3	sybreon
11			`/*`
12	14	sybreon	`* $Id: aeMB_fetch.v,v 1.2 2007-04-04 14:08:34 sybreon Exp $`
13	3	sybreon	`*`
14	14	sybreon	`* AEMB Instruction Fetch`
15	3	sybreon	`* Copyright (C) 2006 Shawn Tan Ser Ngiap <shawn.tan@aeste.net>`
16			`*`
17			`* This library is free software; you can redistribute it and/or modify it`
18			`* under the terms of the GNU Lesser General Public License as published by`
19			`* the Free Software Foundation; either version 2.1 of the License,`
20			`* or (at your option) any later version.`
21			`*`
22			`* This library is distributed in the hope that it will be useful, but`
23			`* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY`
24			`* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public`
25			`* License for more details.`
26			`*`
27			`* You should have received a copy of the GNU Lesser General Public License`
28			`* along with this library; if not, write to the Free Software Foundation, Inc.,`
29			`* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA`
30			`*`
31			`* DESCRIPTION`
32			`* Controls the instruction side of AEMB.`
33			`*`
34			`* HISTORY`
35			`* $Log: not supported by cvs2svn $`
36	14	sybreon	`* Revision 1.1 2007/03/09 17:52:17 sybreon`
37			`* initial import`
38			`*`
39	3	sybreon	`*/`
40
41			`module aeMB_fetch (/AUTOARG/`
42			`// Outputs`
43			`iwb_adr_o, rPC, rPCNXT,`
44			`// Inputs`
45			`iwb_dat_i, nclk, nrst, frun, rFSM, rBRA, rRESULT`
46			`);`
47			`parameter ISIZ = 32;`
48
49			`// Instruction WB I/F`
50			`output [ISIZ-1:0] iwb_adr_o;`
51			`input [31:0] iwb_dat_i;`
52
53			`// System`
54			`input nclk, nrst, frun;`
55
56			`// Internal`
57			`output [31:0] rPC;`
58			`output [31:0] rPCNXT;`
59			`input [1:0] rFSM;`
60			`input rBRA;`
61			`input [31:0] rRESULT;`
62
63			`// WB ADR signal`
64			`reg [31:0] rIWBADR, rPC;`
65			`assign rPCNXT = rIWBADR + 4;`
66			`assign iwb_adr_o = {rIWBADR[ISIZ-1:2],2'b00}; // Word Aligned`
67
68			`always @(negedge nclk or negedge nrst)`
69			`if (!nrst) begin`
70			`/AUTORESET/`
71			`// Beginning of autoreset for uninitialized flops`
72			`rIWBADR <= 32'h0;`
73			`rPC <= 32'h0;`
74			`// End of automatics`
75			`end else begin`
76			`// PC Sources - ALU, Direct, Next`
77			`case (rFSM)`
78			`2'b01: rIWBADR <= #1 32'h00000010; // HWINT`
79			`2'b10: rIWBADR <= #1 32'h00000020; // HWEXC`
80			`//2'b11: rIWBADR <= #1 32'h00000008; // SWEXC`
81			`default: rIWBADR <= #1 (rBRA) ? rRESULT : rPCNXT;`
82			`endcase // case(rFSM)`
83
84			`rPC <= #1 {rIWBADR[31:2],2'd0};`
85			`end // if (frun)`
86
87
88			`endmodule // aeMB_fetch`
89

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[/] [aemb/] [tags/] [AEMB_7_05/] [rtl/] [verilog/] [aeMB_fetch.v] - Blame information for rev 14