Subversion Repositories oms8051mini

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

////                                                              ////

////  8051 cache ram                                              ////

////                                                              ////

////  This file is part of the 8051 cores project                 ////

////  http://www.opencores.org/cores/oms8051mini/                 ////

////                                                              ////

////  Description                                                 ////

////   64x31 dual port ram                                        ////

////                                                              ////

////  To Do:                                                      ////

////   nothing                                                    ////

////                                                              ////

////  Author(s):                                                  ////

////      - Simon Teran, simont@opencores.org                     ////

////      - Dinesh Annayya, dinesha@opencores.org                 ////

////                                                              ////

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

////   v0.0 - Dinesh A, 5th Jan 2017

////        1. Active edge of reset changed from High to Low

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

////                                                              ////

//// 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: not supported by cvs2svn $

//

//

`include "top_defines.v"

//

// duble port ram

//

module oc8051_ram_64x32_dual_bist (

                     clk,

                     resetn,

                     adr0,

                     dat0_o,

                     en0,

                     adr1,

                     dat1_i,

                     dat1_o,

                     en1,

                     wr1

`ifdef OC8051_BIST

         ,

         scanb_rst,

         scanb_clk,

         scanb_si,

         scanb_so,

         scanb_en

`endif

                     );

parameter ADR_WIDTH = 6;

input         clk,

              wr1,

              resetn,

              en0,

              en1;

input  [7:0]  dat1_i;

input  [ADR_WIDTH-1:0]  adr0;

input  [ADR_WIDTH-1:0]  adr1;

output [31:0]  dat0_o;

output [31:0]  dat1_o;

reg    [7:0]  rd_data;

`ifdef OC8051_BIST

input   scanb_rst;

input   scanb_clk;

input   scanb_si;

output  scanb_so;

input   scanb_en;

`endif

`ifdef OC8051_RAM_XILINX

  xilinx_ram_dp u_ram_dp(

        // read port

        .CLKA(clk),

        .RSTA(resetn),

        .ENA(en0),

        .ADDRA(adr0),

        .DIA(32'h00),

        .WEA(1'b0),

        .DOA(dat0_o),

        // write port

        .CLKB(clk),

        .RSTB(resetn),

        .ENB(en1),

        .ADDRB(adr1),

        .DIB(dat1_i),

        .WEB(wr1),

        .DOB(dat1_o)

  );

  defparam

        xilinx_ram.dwidth = 32,

        xilinx_ram.awidth = ADR_WIDTH;

`else

  `ifdef OC8051_RAM_VIRTUALSILICON

  `else

    `ifdef OC8051_RAM_GENERIC

      generic_dpram #(ADR_WIDTH, 32) u_ram_dp(

        .rclk  ( clk            ),

        .resetn  ( resetn            ),

        .rce   ( en0            ),

        .oe    ( 1'b1           ),

        .raddr ( adr0           ),

        .do    ( dat0_o         ),

        .wclk  ( clk            ),

        .wresetn  ( resetn      ),

        .wce   ( en1            ),

        .we    ( wr1            ),

        .waddr ( adr1           ),

        .di    ( dat1_i         )

      );

    `else

      reg [31:0] dat1_o;

      reg [31:0] dat0_o;

      //

      // buffer

      reg    [31:0]  buff [0:(1<<ADR_WIDTH) -1];

      always @(posedge clk or negedge resetn)

      begin

        if (resetn == 1'b0)

          dat1_o     <= 32'h0;

        else if (wr1) begin

          buff[adr1] <= dat1_i;

          dat1_o    <= dat1_i;

        end else

          dat1_o <= buff[adr1];

      end

      always @(posedge clk or negedge resetn)

      begin

        if (resetn == 1'b0)

          dat0_o <= 32'h0;

        else if ((adr0==adr1) & wr1)

          dat0_o <= dat1_i;

        else

          dat0_o <= buff[adr0];

      end

    `endif  //OC8051_RAM_GENERIC

  `endif    //OC8051_RAM_VIRTUALSILICON  

`endif      //OC8051_RAM_XILINX

endmodule