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[/] [or1k/] [tags/] [rel_7/] [or1200/] [rtl/] [verilog/] [or1200_spram_512x20.v] - Rev 1765
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////////////////////////////////////////////////////////////////////// //// //// //// Generic Single-Port Synchronous RAM //// //// //// //// This file is part of memory library available from //// //// http://www.opencores.org/cvsweb.shtml/generic_memories/ //// //// //// //// Description //// //// This block is a wrapper with common single-port //// //// synchronous memory interface for different //// //// types of ASIC and FPGA RAMs. Beside universal memory //// //// interface it also provides behavioral model of generic //// //// single-port synchronous RAM. //// //// It should be used in all OPENCORES designs that want to be //// //// portable accross different target technologies and //// //// independent of target memory. //// //// //// //// Supported ASIC RAMs are: //// //// - Artisan Single-Port Sync RAM //// //// - Avant! Two-Port Sync RAM (*) //// //// - Virage Single-Port Sync RAM //// //// - Virtual Silicon Single-Port Sync RAM //// //// //// //// Supported FPGA RAMs are: //// //// - Xilinx Virtex RAMB4_S16 //// //// //// //// To Do: //// //// - xilinx rams need external tri-state logic //// //// - fix avant! two-port ram //// //// - add additional RAMs (Altera etc) //// //// //// //// 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: not supported by cvs2svn $ // Revision 1.1 2002/01/03 08:16:15 lampret // New prefixes for RTL files, prefixed module names. Updated cache controllers and MMUs. // // Revision 1.10 2001/11/27 21:24:04 lampret // Changed instantiation name of VS RAMs. // // Revision 1.9 2001/11/27 19:45:04 lampret // Fixed VS RAM instantiation - again. // // Revision 1.8 2001/11/23 21:42:31 simons // Program counter divided to PPC and NPC. // // Revision 1.6 2001/10/21 17:57:16 lampret // Removed params from generic_XX.v. Added translate_off/on in sprs.v and id.v. Removed spr_addr from dc.v and ic.v. Fixed CR+LF. // // Revision 1.5 2001/10/14 13:12:09 lampret // MP3 version. // // Revision 1.1.1.1 2001/10/06 10:18:36 igorm // no message // // Revision 1.1 2001/08/09 13:39:33 lampret // Major clean-up. // // Revision 1.2 2001/07/30 05:38:02 lampret // Adding empty directories required by HDL coding guidelines // // // synopsys translate_off `include "timescale.v" // synopsys translate_on `include "or1200_defines.v" module or1200_spram_512x20( `ifdef OR1200_BIST // RAM BIST scanb_rst, scanb_si, scanb_so, scanb_en, scanb_clk, `endif // Generic synchronous single-port RAM interface clk, rst, ce, we, oe, addr, di, do ); // // Default address and data buses width // parameter aw = 9; parameter dw = 20; `ifdef OR1200_BIST // // RAM BIST // input scanb_rst, scanb_si, scanb_en, scanb_clk; output scanb_so; `endif // // Generic synchronous single-port RAM interface // input clk; // Clock input rst; // Reset input ce; // Chip enable input input we; // Write enable input input oe; // Output enable input input [aw-1:0] addr; // address bus inputs input [dw-1:0] di; // input data bus output [dw-1:0] do; // output data bus // // Internal wires and registers // wire [3:0] unconnected; `ifdef OR1200_VIRTUALSILICON_SSP `else `ifdef OR1200_BIST assign scanb_so = scanb_si; `endif `endif `ifdef OR1200_ARTISAN_SSP // // Instantiation of ASIC memory: // // Artisan Synchronous Single-Port RAM (ra1sh) // `ifdef UNUSED art_hssp_512x20 #(dw, 1<<aw, aw) artisan_ssp( `else art_hssp_512x20 artisan_ssp( `endif .clk(clk), .cen(~ce), .wen(~we), .a(addr), .d(di), .oen(~oe), .q(do) ); `else `ifdef OR1200_AVANT_ATP // // Instantiation of ASIC memory: // // Avant! Asynchronous Two-Port RAM // avant_atp avant_atp( .web(~we), .reb(), .oeb(~oe), .rcsb(), .wcsb(), .ra(addr), .wa(addr), .di(di), .do(do) ); `else `ifdef OR1200_VIRAGE_SSP // // Instantiation of ASIC memory: // // Virage Synchronous 1-port R/W RAM // virage_ssp virage_ssp( .clk(clk), .adr(addr), .d(di), .we(we), .oe(oe), .me(ce), .q(do) ); `else `ifdef OR1200_VIRTUALSILICON_SSP // // Instantiation of ASIC memory: // // Virtual Silicon Single-Port Synchronous SRAM // `ifdef UNUSED vs_hdsp_512x20 #(1<<aw, aw-1, dw-1) vs_ssp( `else `ifdef OR1200_BIST vs_hdsp_512x20_bist vs_ssp( `else vs_hdsp_512x20 vs_ssp( `endif `endif `ifdef OR1200_BIST // RAM BIST .scanb_rst(scanb_rst), .scanb_si(scanb_si), .scanb_so(scanb_so), .scanb_en(scanb_en), .scanb_clk(scanb_clk), `endif .CK(clk), .ADR(addr), .DI(di), .WEN(~we), .CEN(~ce), .OEN(~oe), .DOUT(do) ); `else `ifdef OR1200_XILINX_RAMB4 // // Instantiation of FPGA memory: // // Virtex/Spartan2 // // // Block 0 // RAMB4_S8 ramb4_s8_0( .CLK(clk), .RST(rst), .ADDR(addr), .DI(di[7:0]), .EN(ce), .WE(we), .DO(do[7:0]) ); // // Block 1 // RAMB4_S8 ramb4_s8_1( .CLK(clk), .RST(rst), .ADDR(addr), .DI(di[15:8]), .EN(ce), .WE(we), .DO(do[15:8]) ); // // Block 2 // RAMB4_S8 ramb4_s8_2( .CLK(clk), .RST(rst), .ADDR(addr), .DI({4'b0000, di[19:16]}), .EN(ce), .WE(we), .DO({unconnected, do[19:16]}) ); `else // // Generic single-port synchronous RAM model // // // Generic RAM's registers and wires // reg [dw-1:0] mem [(1<<aw)-1:0]; // RAM content reg [dw-1:0] do_reg; // RAM data output register // // Data output drivers // assign do = (oe) ? do_reg : {dw{1'bz}}; // // RAM read and write // always @(posedge clk) if (ce && !we) do_reg <= #1 mem[addr]; else if (ce && we) mem[addr] <= #1 di; `endif // !OR1200_XILINX_RAMB4_S16 `endif // !OR1200_VIRTUALSILICON_SSP `endif // !OR1200_VIRAGE_SSP `endif // !OR1200_AVANT_ATP `endif // !OR1200_ARTISAN_SSP endmodule