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//////////////////////////////////////////////////////////////////////
////                                                              ////
////  OR1200's Store Buffer FIFO                                  ////
////                                                              ////
////  This file is part of the OpenRISC 1200 project              ////
////  http://www.opencores.org/cores/or1k/                        ////
////                                                              ////
////  Description                                                 ////
////  Implementation of store buffer FIFO.                        ////
////                                                              ////
////  To Do:                                                      ////
////   - N/A                                                      ////
////                                                              ////
////  Author(s):                                                  ////
////      - Damjan Lampret, lampret@opencores.org                 ////
////                                                              ////
//////////////////////////////////////////////////////////////////////
////                                                              ////
//// Copyright (C) 2002 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                     ////
////                                                              ////
//////////////////////////////////////////////////////////////////////
//
// CVS Revision History
//
// $Log: not supported by cvs2svn $
// Revision 1.2  2002/08/22 02:18:55  lampret
// Store buffer has been tested and it works. BY default it is still disabled until uClinux confirms correct operation on FPGA board.
//
// Revision 1.1  2002/08/18 19:53:08  lampret
// Added store buffer.
//
//
 
// synopsys translate_off
`include "timescale.v"
// synopsys translate_on
`include "or1200_defines.v"
 
module or1200_sb_fifo(
        clk_i, rst_i, dat_i, wr_i, rd_i, dat_o, full_o, empty_o
);
 
parameter dw = 68;
parameter fw = `OR1200_SB_LOG;
parameter fl = `OR1200_SB_ENTRIES;
 
//
// FIFO signals
//
input                   clk_i;  // Clock
input                   rst_i;  // Reset
input   [dw-1:0] dat_i;  // Input data bus
input                   wr_i;   // Write request
input                   rd_i;   // Read request
output [dw-1:0]  dat_o;  // Output data bus
output                  full_o; // FIFO full
output                  empty_o;// FIFO empty
 
//
// Internal regs
//
reg     [dw-1:0] mem [fl-1:0];
reg     [dw-1:0] dat_o;
reg     [fw+1:0] cntr;
reg     [fw-1:0] wr_pntr;
reg     [fw-1:0] rd_pntr;
reg                     empty_o;
reg                     full_o;
 
always @(posedge clk_i or posedge rst_i)
        if (rst_i) begin
                full_o <= #1 1'b0;
                empty_o <= #1 1'b1;
                wr_pntr <= #1 {fw{1'b0}};
                rd_pntr <= #1 {fw{1'b0}};
                cntr <= #1 {fw+2{1'b0}};
                dat_o <= #1 {dw{1'b0}};
        end
        else if (wr_i && rd_i) begin            // FIFO Read and Write
                mem[wr_pntr] <= #1 dat_i;
                if (wr_pntr >= fl-1)
                        wr_pntr <= #1 {fw{1'b0}};
                else
                        wr_pntr <= #1 wr_pntr + 1'b1;
                if (empty_o) begin
                        dat_o <= #1 dat_i;
                end
                else begin
                        dat_o <= #1 mem[rd_pntr];
                end
                if (rd_pntr >= fl-1)
                        rd_pntr <= #1 {fw{1'b0}};
                else
                        rd_pntr <= #1 rd_pntr + 1'b1;
        end
        else if (wr_i && !full_o) begin         // FIFO Write
                mem[wr_pntr] <= #1 dat_i;
                cntr <= #1 cntr + 1'b1;
                empty_o <= #1 1'b0;
                if (cntr >= (fl-1)) begin
                        full_o <= #1 1'b1;
                        cntr <= #1 fl;
                end
                if (wr_pntr >= fl-1)
                        wr_pntr <= #1 {fw{1'b0}};
                else
                        wr_pntr <= #1 wr_pntr + 1'b1;
        end
        else if (rd_i && !empty_o) begin        // FIFO Read
                dat_o <= #1 mem[rd_pntr];
                cntr <= #1 cntr - 1'b1;
                full_o <= #1 1'b0;
                if (cntr <= 1) begin
                        empty_o <= #1 1'b1;
                        cntr <= #1 {fw+2{1'b0}};
                end
                if (rd_pntr >= fl-1)
                        rd_pntr <= #1 {fw{1'b0}};
                else
                        rd_pntr <= #1 rd_pntr + 1'b1;
        end
 
endmodule

Line No.	Rev	Author	Line
1	977	lampret	`//////////////////////////////////////////////////////////////////////`
2			`//// ////`
3			`//// OR1200's Store Buffer FIFO ////`
4			`//// ////`
5			`//// This file is part of the OpenRISC 1200 project ////`
6			`//// http://www.opencores.org/cores/or1k/ ////`
7			`//// ////`
8			`//// Description ////`
9			`//// Implementation of store buffer FIFO. ////`
10			`//// ////`
11			`//// To Do: ////`
12			`//// - N/A ////`
13			`//// ////`
14			`//// Author(s): ////`
15			`//// - Damjan Lampret, lampret@opencores.org ////`
16			`//// ////`
17			`//////////////////////////////////////////////////////////////////////`
18			`//// ////`
19			`//// Copyright (C) 2002 Authors and OPENCORES.ORG ////`
20			`//// ////`
21			`//// This source file may be used and distributed without ////`
22			`//// restriction provided that this copyright statement is not ////`
23			`//// removed from the file and that any derivative work contains ////`
24			`//// the original copyright notice and the associated disclaimer. ////`
25			`//// ////`
26			`//// This source file is free software; you can redistribute it ////`
27			`//// and/or modify it under the terms of the GNU Lesser General ////`
28			`//// Public License as published by the Free Software Foundation; ////`
29			`//// either version 2.1 of the License, or (at your option) any ////`
30			`//// later version. ////`
31			`//// ////`
32			`//// This source is distributed in the hope that it will be ////`
33			`//// useful, but WITHOUT ANY WARRANTY; without even the implied ////`
34			`//// warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR ////`
35			`//// PURPOSE. See the GNU Lesser General Public License for more ////`
36			`//// details. ////`
37			`//// ////`
38			`//// You should have received a copy of the GNU Lesser General ////`
39			`//// Public License along with this source; if not, download it ////`
40			`//// from http://www.opencores.org/lgpl.shtml ////`
41			`//// ////`
42			`//////////////////////////////////////////////////////////////////////`
43			`//`
44			`// CVS Revision History`
45			`//`
46			`// $Log: not supported by cvs2svn $`
47	1083	simons	`// Revision 1.2 2002/08/22 02:18:55 lampret`
48			`// Store buffer has been tested and it works. BY default it is still disabled until uClinux confirms correct operation on FPGA board.`
49			`//`
50	994	lampret	`// Revision 1.1 2002/08/18 19:53:08 lampret`
51			`// Added store buffer.`
52	977	lampret	`//`
53	994	lampret	`//`
54	977	lampret
55			`// synopsys translate_off`
56			`include "timescale.v"
57			`// synopsys translate_on`
58			`include "or1200_defines.v"
59
60			`module or1200_sb_fifo(`
61			`clk_i, rst_i, dat_i, wr_i, rd_i, dat_o, full_o, empty_o`
62			`);`
63
64	994	lampret	`parameter dw = 68;`
65			parameter fw = `OR1200_SB_LOG;
66			parameter fl = `OR1200_SB_ENTRIES;
67	977	lampret
68			`//`
69			`// FIFO signals`
70			`//`
71			`input clk_i; // Clock`
72			`input rst_i; // Reset`
73			`input [dw-1:0] dat_i; // Input data bus`
74			`input wr_i; // Write request`
75			`input rd_i; // Read request`
76	1083	simons	`output [dw-1:0] dat_o; // Output data bus`
77	977	lampret	`output full_o; // FIFO full`
78			`output empty_o;// FIFO empty`
79
80			`//`
81			`// Internal regs`
82			`//`
83	1083	simons	`reg [dw-1:0] mem [fl-1:0];`
84	977	lampret	`reg [dw-1:0] dat_o;`
85			`reg [fw+1:0] cntr;`
86			`reg [fw-1:0] wr_pntr;`
87			`reg [fw-1:0] rd_pntr;`
88			`reg empty_o;`
89			`reg full_o;`
90
91			`always @(posedge clk_i or posedge rst_i)`
92			`if (rst_i) begin`
93			`full_o <= #1 1'b0;`
94			`empty_o <= #1 1'b1;`
95			`wr_pntr <= #1 {fw{1'b0}};`
96			`rd_pntr <= #1 {fw{1'b0}};`
97			`cntr <= #1 {fw+2{1'b0}};`
98			`dat_o <= #1 {dw{1'b0}};`
99			`end`
100	994	lampret	`else if (wr_i && rd_i) begin // FIFO Read and Write`
101	977	lampret	`mem[wr_pntr] <= #1 dat_i;`
102			`if (wr_pntr >= fl-1)`
103			`wr_pntr <= #1 {fw{1'b0}};`
104			`else`
105			`wr_pntr <= #1 wr_pntr + 1'b1;`
106	994	lampret	`if (empty_o) begin`
107	977	lampret	`dat_o <= #1 dat_i;`
108	994	lampret	`end`
109			`else begin`
110	977	lampret	`dat_o <= #1 mem[rd_pntr];`
111	994	lampret	`end`
112	977	lampret	`if (rd_pntr >= fl-1)`
113			`rd_pntr <= #1 {fw{1'b0}};`
114			`else`
115			`rd_pntr <= #1 rd_pntr + 1'b1;`
116			`end`
117			`else if (wr_i && !full_o) begin // FIFO Write`
118			`mem[wr_pntr] <= #1 dat_i;`
119			`cntr <= #1 cntr + 1'b1;`
120			`empty_o <= #1 1'b0;`
121	994	lampret	`if (cntr >= (fl-1)) begin`
122	977	lampret	`full_o <= #1 1'b1;`
123			`cntr <= #1 fl;`
124			`end`
125			`if (wr_pntr >= fl-1)`
126			`wr_pntr <= #1 {fw{1'b0}};`
127			`else`
128			`wr_pntr <= #1 wr_pntr + 1'b1;`
129			`end`
130			`else if (rd_i && !empty_o) begin // FIFO Read`
131			`dat_o <= #1 mem[rd_pntr];`
132			`cntr <= #1 cntr - 1'b1;`
133			`full_o <= #1 1'b0;`
134	994	lampret	`if (cntr <= 1) begin`
135	977	lampret	`empty_o <= #1 1'b1;`
136			`cntr <= #1 {fw+2{1'b0}};`
137			`end`
138			`if (rd_pntr >= fl-1)`
139			`rd_pntr <= #1 {fw{1'b0}};`
140			`else`
141			`rd_pntr <= #1 rd_pntr + 1'b1;`
142			`end`
143
144			`endmodule`

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[/] [or1k/] [branches/] [branch_qmem/] [or1200/] [rtl/] [verilog/] [or1200_sb_fifo.v] - Blame information for rev 1163