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//////////////////////////////////////////////////////////////////////
////                                                              ////
////  OR1200's register file inside CPU                           ////
////                                                              ////
////  This file is part of the OpenRISC 1200 project              ////
////  http://www.opencores.org/project,or1k                       ////
////                                                              ////
////  Description                                                 ////
////  Instantiation of register file memories                     ////
////                                                              ////
////  To Do:                                                      ////
////   - make it smaller and faster                               ////
////                                                              ////
////  Author(s):                                                  ////
////      - Damjan Lampret, lampret@opencores.org                 ////
////                                                              ////
//////////////////////////////////////////////////////////////////////
////                                                              ////
//// Copyright (C) 2000 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                     ////
////                                                              ////
//////////////////////////////////////////////////////////////////////
//
// $Log: or1200_rf.v,v $
// Revision 2.0  2010/06/30 11:00:00  ORSoC
// Minor update: 
// Bugs fixed, coding style changed. 
//
 
// synopsys translate_off
`include "timescale.v"
// synopsys translate_on
`include "or1200_defines.v"
 
module or1200_rf(
        // Clock and reset
        clk, rst,
 
        // Write i/f
        cy_we_i, cy_we_o, supv, wb_freeze, addrw, dataw, we, flushpipe,
 
        // Read i/f
        id_freeze, addra, addrb, dataa, datab, rda, rdb,
 
        // Debug
        spr_cs, spr_write, spr_addr, spr_dat_i, spr_dat_o
);
 
parameter dw = `OR1200_OPERAND_WIDTH;
parameter aw = `OR1200_REGFILE_ADDR_WIDTH;
 
//
// I/O
//
 
//
// Clock and reset
//
input                           clk;
input                           rst;
 
//
// Write i/f
//
input                           cy_we_i;
output                          cy_we_o;
input                           supv;
input                           wb_freeze;
input   [aw-1:0]         addrw;
input   [dw-1:0]         dataw;
input                           we;
input                           flushpipe;
 
//
// Read i/f
//
input                           id_freeze;
input   [aw-1:0]         addra;
input   [aw-1:0]         addrb;
output  [dw-1:0]         dataa;
output  [dw-1:0]         datab;
input                           rda;
input                           rdb;
 
//
// SPR access for debugging purposes
//
input                           spr_cs;
input                           spr_write;
input   [31:0]                   spr_addr;
input   [31:0]                   spr_dat_i;
output  [31:0]                   spr_dat_o;
 
//
// Internal wires and regs
//
wire    [dw-1:0]         from_rfa;
wire    [dw-1:0]         from_rfb;
wire    [aw-1:0]         rf_addra;
wire    [aw-1:0]         rf_addrw;
wire    [dw-1:0]         rf_dataw;
wire                            rf_we;
wire                            spr_valid;
wire                            rf_ena;
wire                            rf_enb;
reg                             rf_we_allow;
 
//
// SPR access is valid when spr_cs is asserted and
// SPR address matches GPR addresses
//
assign spr_valid = spr_cs & (spr_addr[10:5] == `OR1200_SPR_RF);
 
//
// SPR data output is always from RF A
//
assign spr_dat_o = from_rfa;
 
//
// Operand A comes from RF or from saved A register
//
assign dataa = from_rfa;
 
//
// Operand B comes from RF or from saved B register
//
assign datab = from_rfb;
 
//
// RF A read address is either from SPRS or normal from CPU control
//
assign rf_addra = (spr_valid & !spr_write) ? spr_addr[4:0] : addra;
 
//
// RF write address is either from SPRS or normal from CPU control
//
assign rf_addrw = (spr_valid & spr_write) ? spr_addr[4:0] : addrw;
 
//
// RF write data is either from SPRS or normal from CPU datapath
//
assign rf_dataw = (spr_valid & spr_write) ? spr_dat_i : dataw;
 
//
// RF write enable is either from SPRS or normal from CPU control
//
always @(posedge rst or posedge clk)
        if (rst)
                rf_we_allow <= #1 1'b1;
        else if (~wb_freeze)
                rf_we_allow <= #1 ~flushpipe;
 
//assign rf_we = ((spr_valid & spr_write) | (we & ~wb_freeze)) & rf_we_allow & (supv | (|rf_addrw));
assign rf_we = ((spr_valid & spr_write) | (we & ~wb_freeze)) & rf_we_allow;
//assign cy_we_o = cy_we_i && rf_we;
assign cy_we_o = cy_we_i && ~wb_freeze && rf_we_allow;
 
//
// CS RF A asserted when instruction reads operand A and ID stage
// is not stalled
//
//assign rf_ena = rda & ~id_freeze | spr_valid; // probably works with fixed binutils
assign rf_ena = (rda & ~id_freeze) | (spr_valid & !spr_write);  // probably works with fixed binutils
// assign rf_ena = 1'b1;                        // does not work with single-stepping
//assign rf_ena = ~id_freeze | spr_valid;       // works with broken binutils 
 
//
// CS RF B asserted when instruction reads operand B and ID stage
// is not stalled
//
//assign rf_enb = rdb & ~id_freeze | spr_valid;
assign rf_enb = rdb & ~id_freeze;
// assign rf_enb = 1'b1;
//assign rf_enb = ~id_freeze | spr_valid;       // works with broken binutils 
 
`ifdef OR1200_RFRAM_TWOPORT
 
//
// Instantiation of register file two-port RAM A
//
or1200_tpram_32x32 rf_a(
        // Port A
        .clk_a(clk),
        .rst_a(rst),
        .ce_a(rf_ena),
        .we_a(1'b0),
        .oe_a(1'b1),
        .addr_a(rf_addra),
        .di_a(32'h0000_0000),
        .do_a(from_rfa),
 
        // Port B
        .clk_b(clk),
        .rst_b(rst),
        .ce_b(rf_we),
        .we_b(rf_we),
        .oe_b(1'b0),
        .addr_b(rf_addrw),
        .di_b(rf_dataw),
        .do_b()
);
 
//
// Instantiation of register file two-port RAM B
//
or1200_tpram_32x32 rf_b(
        // Port A
        .clk_a(clk),
        .rst_a(rst),
        .ce_a(rf_enb),
        .we_a(1'b0),
        .oe_a(1'b1),
        .addr_a(addrb),
        .di_a(32'h0000_0000),
        .do_a(from_rfb),
 
        // Port B
        .clk_b(clk),
        .rst_b(rst),
        .ce_b(rf_we),
        .we_b(rf_we),
        .oe_b(1'b0),
        .addr_b(rf_addrw),
        .di_b(rf_dataw),
        .do_b()
);
 
`else
 
`ifdef OR1200_RFRAM_DUALPORT
 
//
// Instantiation of register file two-port RAM A
//
   or1200_dpram #
     (
      .aw(5),
      .dw(32)
      )
   rf_a
     (
      // Port A
      .clk_a(clk),
      .ce_a(rf_ena),
      .addr_a(rf_addra),
      .do_a(from_rfa),
 
      // Port B
      .clk_b(clk),
      .ce_b(rf_we),
      .we_b(rf_we),
      .addr_b(rf_addrw),
      .di_b(rf_dataw)
      );
 
   //
   // Instantiation of register file two-port RAM B
   //
   or1200_dpram #
     (
      .aw(5),
      .dw(32)
      )
   rf_b
     (
      // Port A
      .clk_a(clk),
      .ce_a(rf_enb),
      .addr_a(addrb),
      .do_a(from_rfb),
 
      // Port B
      .clk_b(clk),
      .ce_b(rf_we),
      .we_b(rf_we),
      .addr_b(rf_addrw),
      .di_b(rf_dataw)
      );
 
`else
 
`ifdef OR1200_RFRAM_GENERIC
 
//
// Instantiation of generic (flip-flop based) register file
//
or1200_rfram_generic rf_a(
        // Clock and reset
        .clk(clk),
        .rst(rst),
 
        // Port A
        .ce_a(rf_ena),
        .addr_a(rf_addra),
        .do_a(from_rfa),
 
        // Port B
        .ce_b(rf_enb),
        .addr_b(addrb),
        .do_b(from_rfb),
 
        // Port W
        .ce_w(rf_we),
        .we_w(rf_we),
        .addr_w(rf_addrw),
        .di_w(rf_dataw)
);
 
`else
 
//
// RFRAM type not specified
//
initial begin
        $display("Define RFRAM type.");
        $finish;
end
 
`endif
`endif
`endif
 
endmodule

Line No.	Rev	Author	Line
1	10	unneback	`//////////////////////////////////////////////////////////////////////`
2			`//// ////`
3			`//// OR1200's register file inside CPU ////`
4			`//// ////`
5			`//// This file is part of the OpenRISC 1200 project ////`
6	186	julius	`//// http://www.opencores.org/project,or1k ////`
7	10	unneback	`//// ////`
8			`//// Description ////`
9			`//// Instantiation of register file memories ////`
10			`//// ////`
11			`//// To Do: ////`
12			`//// - make it smaller and faster ////`
13			`//// ////`
14			`//// Author(s): ////`
15			`//// - Damjan Lampret, lampret@opencores.org ////`
16			`//// ////`
17			`//////////////////////////////////////////////////////////////////////`
18			`//// ////`
19			`//// Copyright (C) 2000 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	141	marcus.erl	`// $Log: or1200_rf.v,v $`
45			`// Revision 2.0 2010/06/30 11:00:00 ORSoC`
46			`// Minor update:`
47			`// Bugs fixed, coding style changed.`
48			`//`
49	10	unneback
50			`// synopsys translate_off`
51			`include "timescale.v"
52			`// synopsys translate_on`
53			`include "or1200_defines.v"
54
55			`module or1200_rf(`
56			`// Clock and reset`
57			`clk, rst,`
58
59			`// Write i/f`
60	141	marcus.erl	`cy_we_i, cy_we_o, supv, wb_freeze, addrw, dataw, we, flushpipe,`
61	10	unneback
62			`// Read i/f`
63			`id_freeze, addra, addrb, dataa, datab, rda, rdb,`
64
65			`// Debug`
66			`spr_cs, spr_write, spr_addr, spr_dat_i, spr_dat_o`
67			`);`
68
69			parameter dw = `OR1200_OPERAND_WIDTH;
70			parameter aw = `OR1200_REGFILE_ADDR_WIDTH;
71
72			`//`
73			`// I/O`
74			`//`
75
76			`//`
77			`// Clock and reset`
78			`//`
79			`input clk;`
80			`input rst;`
81
82			`//`
83			`// Write i/f`
84			`//`
85	141	marcus.erl	`input cy_we_i;`
86			`output cy_we_o;`
87	10	unneback	`input supv;`
88			`input wb_freeze;`
89			`input [aw-1:0] addrw;`
90			`input [dw-1:0] dataw;`
91			`input we;`
92			`input flushpipe;`
93
94			`//`
95			`// Read i/f`
96			`//`
97			`input id_freeze;`
98			`input [aw-1:0] addra;`
99			`input [aw-1:0] addrb;`
100			`output [dw-1:0] dataa;`
101			`output [dw-1:0] datab;`
102			`input rda;`
103			`input rdb;`
104
105			`//`
106			`// SPR access for debugging purposes`
107			`//`
108			`input spr_cs;`
109			`input spr_write;`
110			`input [31:0] spr_addr;`
111			`input [31:0] spr_dat_i;`
112			`output [31:0] spr_dat_o;`
113
114			`//`
115			`// Internal wires and regs`
116			`//`
117			`wire [dw-1:0] from_rfa;`
118			`wire [dw-1:0] from_rfb;`
119			`wire [aw-1:0] rf_addra;`
120			`wire [aw-1:0] rf_addrw;`
121			`wire [dw-1:0] rf_dataw;`
122			`wire rf_we;`
123			`wire spr_valid;`
124			`wire rf_ena;`
125			`wire rf_enb;`
126			`reg rf_we_allow;`
127
128			`//`
129			`// SPR access is valid when spr_cs is asserted and`
130			`// SPR address matches GPR addresses`
131			`//`
132			assign spr_valid = spr_cs & (spr_addr[10:5] == `OR1200_SPR_RF);
133
134			`//`
135			`// SPR data output is always from RF A`
136			`//`
137			`assign spr_dat_o = from_rfa;`
138
139			`//`
140			`// Operand A comes from RF or from saved A register`
141			`//`
142	141	marcus.erl	`assign dataa = from_rfa;`
143	10	unneback
144			`//`
145			`// Operand B comes from RF or from saved B register`
146			`//`
147	141	marcus.erl	`assign datab = from_rfb;`
148	10	unneback
149			`//`
150			`// RF A read address is either from SPRS or normal from CPU control`
151			`//`
152			`assign rf_addra = (spr_valid & !spr_write) ? spr_addr[4:0] : addra;`
153
154			`//`
155			`// RF write address is either from SPRS or normal from CPU control`
156			`//`
157			`assign rf_addrw = (spr_valid & spr_write) ? spr_addr[4:0] : addrw;`
158
159			`//`
160			`// RF write data is either from SPRS or normal from CPU datapath`
161			`//`
162			`assign rf_dataw = (spr_valid & spr_write) ? spr_dat_i : dataw;`
163
164			`//`
165			`// RF write enable is either from SPRS or normal from CPU control`
166			`//`
167			`always @(posedge rst or posedge clk)`
168			`if (rst)`
169			`rf_we_allow <= #1 1'b1;`
170			`else if (~wb_freeze)`
171			`rf_we_allow <= #1 ~flushpipe;`
172
173	141	marcus.erl	`//assign rf_we = ((spr_valid & spr_write) \| (we & ~wb_freeze)) & rf_we_allow & (supv \| (\|rf_addrw));`
174			`assign rf_we = ((spr_valid & spr_write) \| (we & ~wb_freeze)) & rf_we_allow;`
175			`//assign cy_we_o = cy_we_i && rf_we;`
176			`assign cy_we_o = cy_we_i && ~wb_freeze && rf_we_allow;`
177	10	unneback
178			`//`
179			`// CS RF A asserted when instruction reads operand A and ID stage`
180			`// is not stalled`
181			`//`
182	141	marcus.erl	`//assign rf_ena = rda & ~id_freeze \| spr_valid; // probably works with fixed binutils`
183			`assign rf_ena = (rda & ~id_freeze) \| (spr_valid & !spr_write); // probably works with fixed binutils`
184	10	unneback	`// assign rf_ena = 1'b1; // does not work with single-stepping`
185			`//assign rf_ena = ~id_freeze \| spr_valid; // works with broken binutils`
186
187			`//`
188			`// CS RF B asserted when instruction reads operand B and ID stage`
189			`// is not stalled`
190			`//`
191	141	marcus.erl	`//assign rf_enb = rdb & ~id_freeze \| spr_valid;`
192			`assign rf_enb = rdb & ~id_freeze;`
193	10	unneback	`// assign rf_enb = 1'b1;`
194			`//assign rf_enb = ~id_freeze \| spr_valid; // works with broken binutils`
195
196			`ifdef OR1200_RFRAM_TWOPORT
197
198			`//`
199			`// Instantiation of register file two-port RAM A`
200			`//`
201			`or1200_tpram_32x32 rf_a(`
202			`// Port A`
203			`.clk_a(clk),`
204			`.rst_a(rst),`
205			`.ce_a(rf_ena),`
206			`.we_a(1'b0),`
207			`.oe_a(1'b1),`
208			`.addr_a(rf_addra),`
209			`.di_a(32'h0000_0000),`
210			`.do_a(from_rfa),`
211
212			`// Port B`
213			`.clk_b(clk),`
214			`.rst_b(rst),`
215			`.ce_b(rf_we),`
216			`.we_b(rf_we),`
217			`.oe_b(1'b0),`
218			`.addr_b(rf_addrw),`
219			`.di_b(rf_dataw),`
220			`.do_b()`
221			`);`
222
223			`//`
224			`// Instantiation of register file two-port RAM B`
225			`//`
226			`or1200_tpram_32x32 rf_b(`
227			`// Port A`
228			`.clk_a(clk),`
229			`.rst_a(rst),`
230			`.ce_a(rf_enb),`
231			`.we_a(1'b0),`
232			`.oe_a(1'b1),`
233			`.addr_a(addrb),`
234			`.di_a(32'h0000_0000),`
235			`.do_a(from_rfb),`
236
237			`// Port B`
238			`.clk_b(clk),`
239			`.rst_b(rst),`
240			`.ce_b(rf_we),`
241			`.we_b(rf_we),`
242			`.oe_b(1'b0),`
243			`.addr_b(rf_addrw),`
244			`.di_b(rf_dataw),`
245			`.do_b()`
246			`);`
247
248			`else
249
250			`ifdef OR1200_RFRAM_DUALPORT
251
252			`//`
253			`// Instantiation of register file two-port RAM A`
254			`//`
255	141	marcus.erl	`or1200_dpram #`
256			`(`
257			`.aw(5),`
258			`.dw(32)`
259			`)`
260			`rf_a`
261			`(`
262			`// Port A`
263			`.clk_a(clk),`
264			`.ce_a(rf_ena),`
265			`.addr_a(rf_addra),`
266			`.do_a(from_rfa),`
267
268			`// Port B`
269			`.clk_b(clk),`
270			`.ce_b(rf_we),`
271			`.we_b(rf_we),`
272			`.addr_b(rf_addrw),`
273			`.di_b(rf_dataw)`
274			`);`
275	10	unneback
276	141	marcus.erl	`//`
277			`// Instantiation of register file two-port RAM B`
278			`//`
279			`or1200_dpram #`
280			`(`
281			`.aw(5),`
282			`.dw(32)`
283			`)`
284			`rf_b`
285			`(`
286			`// Port A`
287			`.clk_a(clk),`
288			`.ce_a(rf_enb),`
289			`.addr_a(addrb),`
290			`.do_a(from_rfb),`
291
292			`// Port B`
293			`.clk_b(clk),`
294			`.ce_b(rf_we),`
295			`.we_b(rf_we),`
296			`.addr_b(rf_addrw),`
297			`.di_b(rf_dataw)`
298			`);`
299
300	10	unneback	`else
301
302			`ifdef OR1200_RFRAM_GENERIC
303
304			`//`
305			`// Instantiation of generic (flip-flop based) register file`
306			`//`
307			`or1200_rfram_generic rf_a(`
308			`// Clock and reset`
309			`.clk(clk),`
310			`.rst(rst),`
311
312			`// Port A`
313			`.ce_a(rf_ena),`
314			`.addr_a(rf_addra),`
315			`.do_a(from_rfa),`
316
317			`// Port B`
318			`.ce_b(rf_enb),`
319			`.addr_b(addrb),`
320			`.do_b(from_rfb),`
321
322			`// Port W`
323			`.ce_w(rf_we),`
324			`.we_w(rf_we),`
325			`.addr_w(rf_addrw),`
326			`.di_w(rf_dataw)`
327			`);`
328
329			`else
330
331			`//`
332			`// RFRAM type not specified`
333			`//`
334			`initial begin`
335			`$display("Define RFRAM type.");`
336			`$finish;`
337			`end`
338
339			`endif
340			`endif
341			`endif
342
343			`endmodule`

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