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//////////////////////////////////////////////////////////////////////

////                                                              ////

////  OR1200's register file generic memory                       ////

////                                                              ////

////  This file is part of the OpenRISC 1200 project              ////

////  http://www.opencores.org/cores/or1k/                        ////

////                                                              ////

////  Description                                                 ////

////  Generic (flip-flop based) register file memory              ////

////                                                              ////

////  To Do:                                                      ////

////   - nothing                                                  ////

////                                                              ////

////  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                     ////

////                                                              ////

//////////////////////////////////////////////////////////////////////

//

// CVS Revision History

// $Log: or1200_rfram_generic.v,v $

// Revision 1.3  2004/06/08 18:16:32  lampret

// GPR0 hardwired to zero.

//

// Revision 1.2  2002/09/03 22:28:21  lampret

// As per Taylor Su suggestion all case blocks are full case by default and optionally (OR1200_CASE_DEFAULT) can be disabled to increase clock frequncy.

//

// Revision 1.1  2002/06/08 16:23:30  lampret

// Generic flip-flop based memory macro for register file.

//

//

// synopsys translate_off

`include "timescale.v"

// synopsys translate_on

`include "or1200_defines.v"

module or1200_rfram_generic(

        // Clock and reset

        clk, rst,

        // Port A

        ce_a, addr_a, do_a,

        // Port B

        ce_b, addr_b, do_b,

        // Port W

        ce_w, we_w, addr_w, di_w

);

parameter dw = `OR1200_OPERAND_WIDTH;

parameter aw = `OR1200_REGFILE_ADDR_WIDTH;

//

// I/O

//

//

// Clock and reset

//

input                           clk;

input                           rst;

//

// Port A

//

input                           ce_a;

input   [aw-1:0]         addr_a;

output  [dw-1:0]         do_a;

//

// Port B

//

input                           ce_b;

input   [aw-1:0]         addr_b;

output  [dw-1:0]         do_b;

//

// Port W

//

input                           ce_w;

input                           we_w;

input   [aw-1:0]         addr_w;

input   [dw-1:0]         di_w;

//

// Internal wires and regs

//

reg     [aw-1:0]         intaddr_a;

reg     [aw-1:0]         intaddr_b;

`ifdef OR1200_RFRAM_16REG

reg     [16*dw-1:0]              mem;

`else

reg     [32*dw-1:0]              mem;

`endif

reg     [dw-1:0]         do_a;

reg     [dw-1:0]         do_b;

   // Function to access GPRs (for use by Verilator). No need to hide this one

   // from the simulator, since it has an input (as required by IEEE 1364-2001).

   function [31:0] get_gpr;

      // verilator public

      input [aw-1:0]             gpr_no;

      get_gpr = { mem[gpr_no*32 + 31], mem[gpr_no*32 + 30],

                  mem[gpr_no*32 + 29], mem[gpr_no*32 + 28],

                  mem[gpr_no*32 + 27], mem[gpr_no*32 + 26],

                  mem[gpr_no*32 + 25], mem[gpr_no*32 + 24],

                  mem[gpr_no*32 + 23], mem[gpr_no*32 + 22],

                  mem[gpr_no*32 + 21], mem[gpr_no*32 + 20],

                  mem[gpr_no*32 + 19], mem[gpr_no*32 + 18],

                  mem[gpr_no*32 + 17], mem[gpr_no*32 + 16],

                  mem[gpr_no*32 + 15], mem[gpr_no*32 + 14],

                  mem[gpr_no*32 + 13], mem[gpr_no*32 + 12],

                  mem[gpr_no*32 + 11], mem[gpr_no*32 + 10],

                  mem[gpr_no*32 +  9], mem[gpr_no*32 +  8],

                  mem[gpr_no*32 +  7], mem[gpr_no*32 +  6],

                  mem[gpr_no*32 +  5], mem[gpr_no*32 +  4],

                  mem[gpr_no*32 +  3], mem[gpr_no*32 +  2],

                  mem[gpr_no*32 +  1], mem[gpr_no*32 +  0] };

   endfunction // get_gpr

//

// Write port

//

always @(posedge clk or posedge rst)

        if (rst) begin

                mem <= #1 {512'h0, 512'h0};

        end

        else if (ce_w & we_w)

                case (addr_w)   // synopsys parallel_case

                        5'd01: mem[32*1+31:32*1] <= #1 di_w;

                        5'd02: mem[32*2+31:32*2] <= #1 di_w;

                        5'd03: mem[32*3+31:32*3] <= #1 di_w;

                        5'd04: mem[32*4+31:32*4] <= #1 di_w;

                        5'd05: mem[32*5+31:32*5] <= #1 di_w;

                        5'd06: mem[32*6+31:32*6] <= #1 di_w;

                        5'd07: mem[32*7+31:32*7] <= #1 di_w;

                        5'd08: mem[32*8+31:32*8] <= #1 di_w;

                        5'd09: mem[32*9+31:32*9] <= #1 di_w;

                        5'd10: mem[32*10+31:32*10] <= #1 di_w;

                        5'd11: mem[32*11+31:32*11] <= #1 di_w;

                        5'd12: mem[32*12+31:32*12] <= #1 di_w;

                        5'd13: mem[32*13+31:32*13] <= #1 di_w;

                        5'd14: mem[32*14+31:32*14] <= #1 di_w;

                        5'd15: mem[32*15+31:32*15] <= #1 di_w;

`ifdef OR1200_RFRAM_16REG

`else

                        5'd16: mem[32*16+31:32*16] <= #1 di_w;

                        5'd17: mem[32*17+31:32*17] <= #1 di_w;

                        5'd18: mem[32*18+31:32*18] <= #1 di_w;

                        5'd19: mem[32*19+31:32*19] <= #1 di_w;

                        5'd20: mem[32*20+31:32*20] <= #1 di_w;

                        5'd21: mem[32*21+31:32*21] <= #1 di_w;

                        5'd22: mem[32*22+31:32*22] <= #1 di_w;

                        5'd23: mem[32*23+31:32*23] <= #1 di_w;

                        5'd24: mem[32*24+31:32*24] <= #1 di_w;

                        5'd25: mem[32*25+31:32*25] <= #1 di_w;

                        5'd26: mem[32*26+31:32*26] <= #1 di_w;

                        5'd27: mem[32*27+31:32*27] <= #1 di_w;

                        5'd28: mem[32*28+31:32*28] <= #1 di_w;

                        5'd29: mem[32*29+31:32*29] <= #1 di_w;

                        5'd30: mem[32*30+31:32*30] <= #1 di_w;

                        5'd31: mem[32*31+31:32*31] <= #1 di_w;

`endif

                        default: mem[32*0+31:32*0] <= #1 32'h0000_0000;

                endcase

//

// Read port A

//

always @(posedge clk or posedge rst)

        if (rst) begin

                intaddr_a <= #1 5'h00;

        end

        else if (ce_a)

                intaddr_a <= #1 addr_a;

always @(mem or intaddr_a)

        case (intaddr_a)        // synopsys parallel_case

                5'd01: do_a = mem[32*1+31:32*1];

                5'd02: do_a = mem[32*2+31:32*2];

                5'd03: do_a = mem[32*3+31:32*3];

                5'd04: do_a = mem[32*4+31:32*4];

                5'd05: do_a = mem[32*5+31:32*5];

                5'd06: do_a = mem[32*6+31:32*6];

                5'd07: do_a = mem[32*7+31:32*7];

                5'd08: do_a = mem[32*8+31:32*8];

                5'd09: do_a = mem[32*9+31:32*9];

                5'd10: do_a = mem[32*10+31:32*10];

                5'd11: do_a = mem[32*11+31:32*11];

                5'd12: do_a = mem[32*12+31:32*12];

                5'd13: do_a = mem[32*13+31:32*13];

                5'd14: do_a = mem[32*14+31:32*14];

                5'd15: do_a = mem[32*15+31:32*15];

`ifdef OR1200_RFRAM_16REG

`else

                5'd16: do_a = mem[32*16+31:32*16];

                5'd17: do_a = mem[32*17+31:32*17];

                5'd18: do_a = mem[32*18+31:32*18];

                5'd19: do_a = mem[32*19+31:32*19];

                5'd20: do_a = mem[32*20+31:32*20];

                5'd21: do_a = mem[32*21+31:32*21];

                5'd22: do_a = mem[32*22+31:32*22];

                5'd23: do_a = mem[32*23+31:32*23];

                5'd24: do_a = mem[32*24+31:32*24];

                5'd25: do_a = mem[32*25+31:32*25];

                5'd26: do_a = mem[32*26+31:32*26];

                5'd27: do_a = mem[32*27+31:32*27];

                5'd28: do_a = mem[32*28+31:32*28];

                5'd29: do_a = mem[32*29+31:32*29];

                5'd30: do_a = mem[32*30+31:32*30];

                5'd31: do_a = mem[32*31+31:32*31];

`endif

                default: do_a = 32'h0000_0000;

        endcase

//

// Read port B

//

always @(posedge clk or posedge rst)

        if (rst) begin

                intaddr_b <= #1 5'h00;

        end

        else if (ce_b)

                intaddr_b <= #1 addr_b;

always @(mem or intaddr_b)

        case (intaddr_b)        // synopsys parallel_case

                5'd01: do_b = mem[32*1+31:32*1];

                5'd02: do_b = mem[32*2+31:32*2];

                5'd03: do_b = mem[32*3+31:32*3];

                5'd04: do_b = mem[32*4+31:32*4];

                5'd05: do_b = mem[32*5+31:32*5];

                5'd06: do_b = mem[32*6+31:32*6];

                5'd07: do_b = mem[32*7+31:32*7];

                5'd08: do_b = mem[32*8+31:32*8];

                5'd09: do_b = mem[32*9+31:32*9];

                5'd10: do_b = mem[32*10+31:32*10];

                5'd11: do_b = mem[32*11+31:32*11];

                5'd12: do_b = mem[32*12+31:32*12];

                5'd13: do_b = mem[32*13+31:32*13];

                5'd14: do_b = mem[32*14+31:32*14];

                5'd15: do_b = mem[32*15+31:32*15];

`ifdef OR1200_RFRAM_16REG

`else

                5'd16: do_b = mem[32*16+31:32*16];

                5'd17: do_b = mem[32*17+31:32*17];

                5'd18: do_b = mem[32*18+31:32*18];

                5'd19: do_b = mem[32*19+31:32*19];

                5'd20: do_b = mem[32*20+31:32*20];

                5'd21: do_b = mem[32*21+31:32*21];

                5'd22: do_b = mem[32*22+31:32*22];

                5'd23: do_b = mem[32*23+31:32*23];

                5'd24: do_b = mem[32*24+31:32*24];

                5'd25: do_b = mem[32*25+31:32*25];

                5'd26: do_b = mem[32*26+31:32*26];

                5'd27: do_b = mem[32*27+31:32*27];

                5'd28: do_b = mem[32*28+31:32*28];

                5'd29: do_b = mem[32*29+31:32*29];

                5'd30: do_b = mem[32*30+31:32*30];

                5'd31: do_b = mem[32*31+31:32*31];

`endif

                default: do_b = 32'h0000_0000;

        endcase

endmodule