//////////////////////////////////////////////////////////////////////
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//////////////////////////////////////////////////////////////////////
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//// ////
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//// ////
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//// Generic Double-Port Synchronous RAM ////
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//// Generic Double-Port Synchronous RAM ////
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//// ////
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//// ////
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//// This file is part of memory library available from ////
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//// This file is part of memory library available from ////
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//// http://www.opencores.org/cvsweb.shtml/generic_memories/ ////
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//// http://www.opencores.org/cvsweb.shtml/generic_memories/ ////
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//// ////
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//// ////
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//// Description ////
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//// Description ////
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//// This block is a wrapper with common double-port ////
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//// This block is a wrapper with common double-port ////
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//// synchronous memory interface for different ////
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//// synchronous memory interface for different ////
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//// types of ASIC and FPGA RAMs. Beside universal memory ////
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//// types of ASIC and FPGA RAMs. Beside universal memory ////
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//// interface it also provides behavioral model of generic ////
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//// interface it also provides behavioral model of generic ////
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//// double-port synchronous RAM. ////
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//// double-port synchronous RAM. ////
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//// It should be used in all OPENCORES designs that want to be ////
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//// It should be used in all OPENCORES designs that want to be ////
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//// portable accross different target technologies and ////
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//// portable accross different target technologies and ////
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//// independent of target memory. ////
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//// independent of target memory. ////
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//// ////
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//// ////
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//// Author(s): ////
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//// Author(s): ////
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//// - Michael Unneback, unneback@opencores.org ////
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//// - Michael Unneback, unneback@opencores.org ////
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//// ////
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//// ////
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//////////////////////////////////////////////////////////////////////
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//////////////////////////////////////////////////////////////////////
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//// ////
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//// ////
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//// Copyright (C) 2000 Authors and OPENCORES.ORG ////
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//// Copyright (C) 2000 Authors and OPENCORES.ORG ////
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//// ////
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//// ////
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//// This source file may be used and distributed without ////
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//// This source file may be used and distributed without ////
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//// restriction provided that this copyright statement is not ////
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//// restriction provided that this copyright statement is not ////
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//// removed from the file and that any derivative work contains ////
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//// removed from the file and that any derivative work contains ////
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//// the original copyright notice and the associated disclaimer. ////
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//// the original copyright notice and the associated disclaimer. ////
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//// ////
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//// ////
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//// This source file is free software; you can redistribute it ////
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//// This source file is free software; you can redistribute it ////
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//// and/or modify it under the terms of the GNU Lesser General ////
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//// and/or modify it under the terms of the GNU Lesser General ////
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//// Public License as published by the Free Software Foundation; ////
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//// Public License as published by the Free Software Foundation; ////
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//// either version 2.1 of the License, or (at your option) any ////
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//// either version 2.1 of the License, or (at your option) any ////
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//// later version. ////
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//// later version. ////
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//// ////
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//// ////
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//// This source is distributed in the hope that it will be ////
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//// This source is distributed in the hope that it will be ////
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//// useful, but WITHOUT ANY WARRANTY; without even the implied ////
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//// useful, but WITHOUT ANY WARRANTY; without even the implied ////
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//// warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR ////
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//// warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR ////
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//// PURPOSE. See the GNU Lesser General Public License for more ////
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//// PURPOSE. See the GNU Lesser General Public License for more ////
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//// details. ////
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//// details. ////
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//// ////
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//// ////
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//// You should have received a copy of the GNU Lesser General ////
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//// You should have received a copy of the GNU Lesser General ////
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//// Public License along with this source; if not, download it ////
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//// Public License along with this source; if not, download it ////
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//// from http://www.opencores.org/lgpl.shtml ////
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//// from http://www.opencores.org/lgpl.shtml ////
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//// ////
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//// ////
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//////////////////////////////////////////////////////////////////////
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//////////////////////////////////////////////////////////////////////
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//
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//
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// CVS Revision History
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// CVS Revision History
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//
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//
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// $Log: or1200_dpram_32x32.v,v $
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// $Log: or1200_dpram_32x32.v,v $
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// Revision 2.0 2010/06/30 11:00:00 ORSoC
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// Revision 2.0 2010/06/30 11:00:00 ORSoC
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// New
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// New
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//
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//
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// synopsys translate_off
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// synopsys translate_off
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`include "timescale.v"
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`include "timescale.v"
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// synopsys translate_on
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// synopsys translate_on
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`include "or1200_defines.v"
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`include "or1200_defines.v"
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module or1200_dpram
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module or1200_dpram
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(
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(
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// Generic synchronous double-port RAM interface
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// Generic synchronous double-port RAM interface
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clk_a, ce_a, addr_a, do_a,
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clk_a, ce_a, addr_a, do_a,
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clk_b, ce_b, we_b, addr_b, di_b
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clk_b, ce_b, we_b, addr_b, di_b
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);
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);
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//
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//
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// Default address and data buses width
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// Default address and data buses width
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//
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//
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parameter aw = 5;
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parameter aw = 5;
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parameter dw = 32;
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parameter dw = 32;
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//
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//
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// Generic synchronous double-port RAM interface
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// Generic synchronous double-port RAM interface
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//
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//
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input clk_a; // Clock
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input clk_a; // Clock
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input ce_a; // Chip enable input
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input ce_a; // Chip enable input
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input [aw-1:0] addr_a; // address bus inputs
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input [aw-1:0] addr_a; // address bus inputs
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output [dw-1:0] do_a; // output data bus
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output [dw-1:0] do_a; // output data bus
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input clk_b; // Clock
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input clk_b; // Clock
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input ce_b; // Chip enable input
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input ce_b; // Chip enable input
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input we_b; // Write enable input
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input we_b; // Write enable input
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input [aw-1:0] addr_b; // address bus inputs
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input [aw-1:0] addr_b; // address bus inputs
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input [dw-1:0] di_b; // input data bus
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input [dw-1:0] di_b; // input data bus
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//
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//
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// Internal wires and registers
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// Internal wires and registers
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//
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//
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//
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//
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// Generic double-port synchronous RAM model
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// Generic double-port synchronous RAM model
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//
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//
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//
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//
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// Generic RAM's registers and wires
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// Generic RAM's registers and wires
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//
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//
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reg [dw-1:0] mem [(1<<aw)-1:0] /*synthesis syn_ramstyle = "no_rw_check"*/; // RAM content
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reg [dw-1:0] mem [(1<<aw)-1:0] /*synthesis syn_ramstyle = "no_rw_check"*/; // RAM content
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reg [aw-1:0] addr_a_reg; // RAM address registered
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reg [aw-1:0] addr_a_reg; // RAM address registered
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// Function to access GPRs (for use by Verilator). No need to hide this one
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// Function to access GPRs (for use by Verilator). No need to hide this one
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// from the simulator, since it has an input (as required by IEEE 1364-2001).
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// from the simulator, since it has an input (as required by IEEE 1364-2001).
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function [31:0] get_gpr;
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function [31:0] get_gpr;
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// verilator public
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// verilator public
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input [aw-1:0] gpr_no;
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input [aw-1:0] gpr_no;
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get_gpr = mem[gpr_no];
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get_gpr = mem[gpr_no];
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endfunction // get_gpr
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endfunction // get_gpr
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function [31:0] set_gpr;
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function [31:0] set_gpr;
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// verilator public
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// verilator public
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input [aw-1:0] gpr_no;
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input [aw-1:0] gpr_no;
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input [dw-1:0] value;
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input [dw-1:0] value;
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begin
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mem[gpr_no] = value;
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mem[gpr_no] = value;
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set_gpr = 0;
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end
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endfunction // get_gpr
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endfunction // get_gpr
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//
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//
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// Data output drivers
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// Data output drivers
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//
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//
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//assign do_a = (oe_a) ? mem[addr_a_reg] : {dw{1'b0}};
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//assign do_a = (oe_a) ? mem[addr_a_reg] : {dw{1'b0}};
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assign do_a = mem[addr_a_reg];
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assign do_a = mem[addr_a_reg];
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//
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//
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// RAM read
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// RAM read
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//
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//
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always @(posedge clk_a)
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always @(posedge clk_a)
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if (ce_a)
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if (ce_a)
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addr_a_reg <= addr_a;
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addr_a_reg <= addr_a;
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//
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//
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// RAM write
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// RAM write
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//
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//
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always @(posedge clk_b)
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always @(posedge clk_b)
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if (ce_b & we_b)
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if (ce_b & we_b)
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mem[addr_b] <= di_b;
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mem[addr_b] <= di_b;
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endmodule // or1200_dpram
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endmodule // or1200_dpram
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