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//////////////////////////////////////////////////////////////////////
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//// ////
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//// Generic Single-Port Synchronous RAM ////
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//// ////
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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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//// ////
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//// Description ////
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//// This block is a wrapper with common single-port ////
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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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//// interface it also provides behavioral model of generic ////
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//// single-port synchronous RAM. ////
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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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//// independent of target memory. ////
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//// ////
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//// Supported ASIC RAMs are: ////
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//// - Artisan Single-Port Sync RAM ////
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//// - Avant! Two-Port Sync RAM (*) ////
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//// - Virage Single-Port Sync RAM ////
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//// - Virtual Silicon Single-Port Sync RAM ////
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//// ////
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//// Supported FPGA RAMs are: ////
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//// - Xilinx Virtex RAMB16 ////
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//// - Xilinx Virtex RAMB4 ////
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//// - Altera LPM ////
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//// ////
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//// To Do: ////
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//// - xilinx rams need external tri-state logic ////
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//// - fix avant! two-port ram ////
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//// - add additional RAMs ////
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//// ////
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//// Author(s): ////
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//// - Damjan Lampret, lampret@opencores.org ////
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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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//// ////
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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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//// 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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//// ////
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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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//// 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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//// later version. ////
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//// ////
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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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//// 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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//// details. ////
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//// ////
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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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//// from http://www.opencores.org/lgpl.shtml ////
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//// ////
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//////////////////////////////////////////////////////////////////////
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//
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// CVS Revision History
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//
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// $Log: or1200_spram_512x20.v,v $
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// Revision 2.0 2010/06/30 11:00:00 ORSoC
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// Minor update:
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// Coding style changed.
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//
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// Revision 1.9 2005/10/19 11:37:56 jcastillo
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// Added support for RAMB16 Xilinx4/Spartan3 primitives
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//
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// Revision 1.8 2004/06/08 18:15:32 lampret
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// Changed behavior of the simulation generic models
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//
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// Revision 1.7 2004/04/05 08:29:57 lampret
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// Merged branch_qmem into main tree.
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//
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// Revision 1.3.4.1 2003/12/09 11:46:48 simons
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// Mbist nameing changed, Artisan ram instance signal names fixed, some synthesis waning fixed.
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//
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// Revision 1.3 2003/04/07 01:19:07 lampret
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// Added Altera LPM RAMs. Changed generic RAM output when OE inactive.
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//
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// Revision 1.2 2002/10/17 20:04:40 lampret
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// Added BIST scan. Special VS RAMs need to be used to implement BIST.
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//
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// Revision 1.1 2002/01/03 08:16:15 lampret
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// New prefixes for RTL files, prefixed module names. Updated cache controllers and MMUs.
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//
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// Revision 1.10 2001/11/27 21:24:04 lampret
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// Changed instantiation name of VS RAMs.
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//
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// Revision 1.9 2001/11/27 19:45:04 lampret
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// Fixed VS RAM instantiation - again.
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//
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// Revision 1.8 2001/11/23 21:42:31 simons
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// Program counter divided to PPC and NPC.
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//
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// Revision 1.6 2001/10/21 17:57:16 lampret
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// 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.
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//
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// Revision 1.5 2001/10/14 13:12:09 lampret
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// MP3 version.
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//
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// Revision 1.1.1.1 2001/10/06 10:18:36 igorm
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// no message
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//
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// Revision 1.1 2001/08/09 13:39:33 lampret
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// Major clean-up.
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//
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// Revision 1.2 2001/07/30 05:38:02 lampret
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// Adding empty directories required by HDL coding guidelines
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//
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//
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// synopsys translate_off
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`include "timescale.v"
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// synopsys translate_on
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`include "or1200_defines.v"
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module or1200_spram_512x20(
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`ifdef OR1200_BIST
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// RAM BIST
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mbist_si_i, mbist_so_o, mbist_ctrl_i,
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`endif
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// Generic synchronous single-port RAM interface
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clk, rst, ce, we, oe, addr, di, doq
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);
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//
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// Default address and data buses width
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//
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parameter aw = 9;
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parameter dw = 20;
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`ifdef OR1200_BIST
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//
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// RAM BIST
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//
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input mbist_si_i;
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input [`OR1200_MBIST_CTRL_WIDTH - 1:0] mbist_ctrl_i;
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output mbist_so_o;
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`endif
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//
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// Generic synchronous single-port RAM interface
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//
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input clk; // Clock
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input rst; // Reset
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input ce; // Chip enable input
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input we; // Write enable input
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input oe; // Output enable input
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input [aw-1:0] addr; // address bus inputs
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input [dw-1:0] di; // input data bus
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output [dw-1:0] doq; // output data bus
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//
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// Internal wires and registers
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//
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`ifdef OR1200_XILINX_RAMB4
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wire [3:0] unconnected;
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`else
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`ifdef OR1200_XILINX_RAMB16
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wire [11:0] unconnected;
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`endif // !OR1200_XILINX_RAMB16
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`endif // !OR1200_XILINX_RAMB4
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`ifdef OR1200_ARTISAN_SSP
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`else
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`ifdef OR1200_VIRTUALSILICON_SSP
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`else
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`ifdef OR1200_BIST
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assign mbist_so_o = mbist_si_i;
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`endif
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`endif
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`endif
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`ifdef OR1200_ARTISAN_SSP
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//
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// Instantiation of ASIC memory:
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//
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// Artisan Synchronous Single-Port RAM (ra1sh)
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//
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`ifdef UNUSED
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art_hssp_512x20 #(dw, 1<<aw, aw) artisan_ssp(
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`else
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`ifdef OR1200_BIST
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art_hssp_512x20_bist artisan_ssp(
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`else
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art_hssp_512x20 artisan_ssp(
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`endif
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`endif
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`ifdef OR1200_BIST
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// RAM BIST
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.mbist_si_i(mbist_si_i),
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.mbist_so_o(mbist_so_o),
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.mbist_ctrl_i(mbist_ctrl_i),
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`endif
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.CLK(clk),
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.CEN(~ce),
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.WEN(~we),
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.A(addr),
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.D(di),
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.OEN(~oe),
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.Q(doq)
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);
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`else
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`ifdef OR1200_AVANT_ATP
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//
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// Instantiation of ASIC memory:
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//
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// Avant! Asynchronous Two-Port RAM
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//
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avant_atp avant_atp(
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.web(~we),
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.reb(),
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.oeb(~oe),
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.rcsb(),
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.wcsb(),
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.ra(addr),
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.wa(addr),
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.di(di),
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.doq(doq)
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);
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`else
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`ifdef OR1200_VIRAGE_SSP
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//
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// Instantiation of ASIC memory:
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//
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// Virage Synchronous 1-port R/W RAM
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//
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virage_ssp virage_ssp(
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.clk(clk),
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.adr(addr),
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.d(di),
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.we(we),
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.oe(oe),
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.me(ce),
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.q(doq)
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);
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`else
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`ifdef OR1200_VIRTUALSILICON_SSP
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//
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// Instantiation of ASIC memory:
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//
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// Virtual Silicon Single-Port Synchronous SRAM
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//
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`ifdef UNUSED
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vs_hdsp_512x20 #(1<<aw, aw-1, dw-1) vs_ssp(
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`else
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`ifdef OR1200_BIST
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vs_hdsp_512x20_bist vs_ssp(
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`else
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vs_hdsp_512x20 vs_ssp(
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`endif
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`endif
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`ifdef OR1200_BIST
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// RAM BIST
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.mbist_si_i(mbist_si_i),
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.mbist_so_o(mbist_so_o),
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.mbist_ctrl_i(mbist_ctrl_i),
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`endif
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.CK(clk),
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.ADR(addr),
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.DI(di),
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.WEN(~we),
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.CEN(~ce),
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.OEN(~oe),
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.DOUT(doq)
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);
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`else
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`ifdef OR1200_XILINX_RAMB4
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//
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// Instantiation of FPGA memory:
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//
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// Virtex/Spartan2
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//
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//
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// Block 0
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//
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RAMB4_S8 ramb4_s8_0(
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.CLK(clk),
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.RST(1'b0),
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.ADDR(addr),
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.DI(di[7:0]),
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.EN(ce),
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.WE(we),
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.DO(doq[7:0])
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);
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//
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// Block 1
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//
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RAMB4_S8 ramb4_s8_1(
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.CLK(clk),
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.RST(1'b0),
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.ADDR(addr),
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.DI(di[15:8]),
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.EN(ce),
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.WE(we),
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.DO(doq[15:8])
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);
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//
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// Block 2
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//
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RAMB4_S8 ramb4_s8_2(
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.CLK(clk),
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.RST(1'b0),
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.ADDR(addr),
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.DI({4'b0000, di[19:16]}),
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.EN(ce),
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.WE(we),
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.DO({unconnected, doq[19:16]})
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);
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`else
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`ifdef OR1200_XILINX_RAMB16
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//
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// Instantiation of FPGA memory:
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//
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// Virtex4/Spartan3E
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//
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// Added By Nir Mor
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//
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RAMB16_S36 ramb16_s36(
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.CLK(clk),
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.SSR(1'b0),
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.ADDR(addr),
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.DI({12'h000,di}),
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.DIP(4'h0),
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.EN(ce),
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.WE(we),
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.DO({unconnected,doq}),
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.DOP()
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);
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`else
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`ifdef OR1200_ALTERA_LPM
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//
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// Instantiation of FPGA memory:
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//
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// Altera LPM
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//
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// Added By Jamil Khatib
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//
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wire wr;
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assign wr = ce & we;
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initial $display("Using Altera LPM.");
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lpm_ram_dq lpm_ram_dq_component (
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.address(addr),
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.inclock(clk),
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.outclock(clk),
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.data(di),
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.we(wr),
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.q(doq)
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);
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defparam lpm_ram_dq_component.lpm_width = dw,
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lpm_ram_dq_component.lpm_widthad = aw,
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lpm_ram_dq_component.lpm_indata = "REGISTERED",
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lpm_ram_dq_component.lpm_address_control = "REGISTERED",
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lpm_ram_dq_component.lpm_outdata = "UNREGISTERED",
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lpm_ram_dq_component.lpm_hint = "USE_EAB=ON";
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// examplar attribute lpm_ram_dq_component NOOPT TRUE
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`else
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//
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// Generic single-port synchronous RAM model
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//
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//
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// Generic RAM's registers and wires
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//
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reg [dw-1:0] mem [(1<<aw)-1:0]; // RAM content
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reg [aw-1:0] addr_reg; // RAM address register
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//
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// Data output drivers
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//
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assign doq = (oe) ? mem[addr_reg] : {dw{1'b0}};
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//
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// RAM address register
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//
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always @(posedge clk or `OR1200_RST_EVENT rst)
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if (rst == `OR1200_RST_VALUE)
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addr_reg <= {aw{1'b0}};
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else if (ce)
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addr_reg <= addr;
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//
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// RAM write
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//
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always @(posedge clk)
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if (ce && we)
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mem[addr] <= di;
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`endif // !OR1200_ALTERA_LPM
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`endif // !OR1200_XILINX_RAMB16
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`endif // !OR1200_XILINX_RAMB4
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`endif // !OR1200_VIRTUALSILICON_SSP
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`endif // !OR1200_VIRAGE_SSP
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`endif // !OR1200_AVANT_ATP
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`endif // !OR1200_ARTISAN_SSP
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endmodule
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