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[/] [openrisc/] [trunk/] [or1200/] [rtl/] [verilog/] [or1200_dpram.v] - Rev 410
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////////////////////////////////////////////////////////////////////// //// //// //// Generic Double-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 double-port //// //// synchronous memory interface for different //// //// types of ASIC and FPGA RAMs. Beside universal memory //// //// interface it also provides behavioral model of generic //// //// double-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. //// //// //// //// Author(s): //// //// - Michael Unneback, unneback@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_dpram_32x32.v,v $ // Revision 2.0 2010/06/30 11:00:00 ORSoC // New // // synopsys translate_off `include "timescale.v" // synopsys translate_on `include "or1200_defines.v" module or1200_dpram ( // Generic synchronous double-port RAM interface clk_a, ce_a, addr_a, do_a, clk_b, ce_b, we_b, addr_b, di_b ); // // Default address and data buses width // parameter aw = 5; parameter dw = 32; // // Generic synchronous double-port RAM interface // input clk_a; // Clock input ce_a; // Chip enable input input [aw-1:0] addr_a; // address bus inputs output [dw-1:0] do_a; // output data bus input clk_b; // Clock input ce_b; // Chip enable input input we_b; // Write enable input input [aw-1:0] addr_b; // address bus inputs input [dw-1:0] di_b; // input data bus // // Internal wires and registers // // // Generic double-port synchronous RAM model // // // Generic RAM's registers and wires // reg [dw-1:0] mem [(1<<aw)-1:0] /*synthesis syn_ramstyle = "no_rw_check"*/; // RAM content reg [aw-1:0] addr_a_reg; // RAM address registered // 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]; endfunction // get_gpr // // Data output drivers // //assign do_a = (oe_a) ? mem[addr_a_reg] : {dw{1'b0}}; assign do_a = mem[addr_a_reg]; // // RAM read // always @(posedge clk_a) if (ce_a) addr_a_reg <= addr_a; // // RAM write // always @(posedge clk_b) if (ce_b & we_b) mem[addr_b] <= di_b; endmodule // or1200_dpram
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