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//////////////////////////////////////////////////////////////////////
////                                                              ////
////  Generic Dual-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 dual-port               ////
////  synchronous memory interface for different                  ////
////  types of ASIC and FPGA RAMs. Beside universal memory        ////
////  interface it also provides behavioral model of generic      ////
////  dual-port synchronous RAM.                                  ////
////  It also contains a fully synthesizeable model for FPGAs.    ////
////  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 Dual-Port Sync RAM                                ////
////  - Avant! Two-Port Sync RAM (*)                              ////
////  - Virage 2-port Sync RAM                                    ////
////                                                              ////
////  Supported FPGA RAMs are:                                    ////
////  - Generic FPGA (VENDOR_FPGA)                                ////
////    Tested RAMs: Altera, Xilinx                               ////
////    Synthesis tools: LeonardoSpectrum, Synplicity             ////
////  - Xilinx (VENDOR_XILINX)                                    ////
////  - Altera (VENDOR_ALTERA)                                    ////
////                                                              ////
////  To Do:                                                      ////
////   - fix Avant!                                               ////
////   - add additional RAMs (VS etc)                             ////
////                                                              ////
////  Author(s):                                                  ////
////      - Richard Herveille, richard@asics.ws                   ////
////      - 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 1.4  2002/09/28 08:18:52  rherveille
// Changed synthesizeable FPGA memory implementation.
// Fixed some issues with Xilinx BlockRAM
//
// Revision 1.3  2001/11/09 00:34:18  samg
// minor changes: unified with all common rams
//
// Revision 1.2  2001/11/08 19:11:31  samg
// added valid checks to behvioral model
//
// Revision 1.1.1.1  2001/09/14 09:57:10  rherveille
// Major cleanup.
// Files are now compliant to Altera & Xilinx memories.
// Memories are now compatible, i.e. drop-in replacements.
// Added synthesizeable generic FPGA description.
// Created "generic_memories" cvs entry.
//
// Revision 1.1.1.2  2001/08/21 13:09:27  damjan
// *** empty log message ***
//
// Revision 1.1  2001/08/20 18:23:20  damjan
// Initial revision
//
// 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
//
//
 
//`include "timescale.v"
 
`define VENDOR_FPGA
//`define VENDOR_XILINX
//`define VENDOR_ALTERA
 
module generic_dpram(
	// Generic synchronous dual-port RAM interface
	rclk, rrst, rce, oe, raddr, do,
	wclk, wrst, wce, we, waddr, di
);
 
	//
	// Default address and data buses width
	//
	parameter aw = 5;  // number of bits in address-bus
	parameter dw = 16; // number of bits in data-bus
 
	//
	// Generic synchronous double-port RAM interface
	//
	// read port
	input           rclk;  // read clock, rising edge trigger
	input           rrst;  // read port reset, active high
	input           rce;   // read port chip enable, active high
	input           oe;	   // output enable, active high
	input  [aw-1:0] raddr; // read address
	output [dw-1:0] do;    // data output
 
	// write port
	input          wclk;  // write clock, rising edge trigger
	input          wrst;  // write port reset, active high
	input          wce;   // write port chip enable, active high
	input          we;    // write enable, active high
	input [aw-1:0] waddr; // write address
	input [dw-1:0] di;    // data input
 
	//
	// Module body
	//
 
`ifdef VENDOR_FPGA
	//
	// Instantiation synthesizeable FPGA memory
	//
	// This code has been tested using LeonardoSpectrum and Synplicity.
	// The code correctly instantiates Altera EABs and Xilinx BlockRAMs.
	//
 
	// NOTE:
	// 'syn_ramstyle="block_ram"' is a Synplify attribute.
	// It instructs Synplify to map to BlockRAMs instead of the default SelectRAMs
	// Altera: "block_ram" only
	// Xilinx: "block_ram" Virtex/Virtex-E (and spartan series) dedicated BlockRAMs
	//         "no_rw_check" avoid generating additional glue logic for dual-port rams
	//         "select_ram" use distributed memory
	//
	// "no_rw_check": For Xilinx devices reading and writing to the same address might
	// yield incorrectread data. Use "no_rw_check" when you register the outputs, or when
	// you don't care about a read/write check
 
	// TODO: Insert Verilog 2001 code to automatically select the implementation style
//	reg [dw-1:0] mem [(1<<aw) -1:0] /* synthesis syn_ramstyle="block_ram" */;
	reg [dw-1:0] mem [(1<<aw) -1:0] /* synthesis syn_ramstyle="no_rw_check" */;
//	reg [dw-1:0] mem [(1<<aw) -1:0] /* synthesis syn_ramstyle="select_ram" */;
 
	reg [aw-1:0] ra;                // register read address
 
	// read operation
	always @(posedge rclk)
	  if (rce)
	    ra <= #1 raddr;
 
	assign do = mem[ra];
 
	// write operation
	always @(posedge wclk)
	  if (we && wce)
	    mem[waddr] <= #1 di;
 
`else
 
`ifdef VENDOR_XILINX
	//
	// Instantiation of FPGA memory:
	//
	// Virtex/Spartan2 BlockRAMs
	//
	xilinx_ram_dp xilinx_ram(
		// read port
		.CLKA(rclk),
		.RSTA(rrst),
		.ENA(rce),
		.ADDRA(raddr),
		.DIA( {dw{1'b0}} ),
		.WEA(1'b0),
		.DOA(do),
 
		// write port
		.CLKB(wclk),
		.RSTB(wrst),
		.ENB(wce),
		.ADDRB(waddr),
		.DIB(di),
		.WEB(we),
		.DOB()
	);
 
	defparam
		xilinx_ram.dwidth = dw,
		xilinx_ram.awidth = aw;
 
`else
 
`ifdef VENDOR_ALTERA
	//
	// Instantiation of FPGA memory:
	//
	// Altera FLEX/APEX EABs
	//
	altera_ram_dp altera_ram(
		// read port
		.rdclock(rclk),
		.rdclocken(rce),
		.rdaddress(raddr),
		.q(do),
 
		// write port
		.wrclock(wclk),
		.wrclocken(wce),
		.wren(we),
		.wraddress(waddr),
		.data(di)
	);
 
	defparam
		altera_ram.dwidth = dw,
		altera_ram.awidth = aw;
 
`else
 
`ifdef VENDOR_ARTISAN
 
	//
	// Instantiation of ASIC memory:
	//
	// Artisan Synchronous Double-Port RAM (ra2sh)
	//
	art_hsdp #(dw, 1<<aw, aw) artisan_sdp(
		// read port
		.qa(do),
		.clka(rclk),
		.cena(~rce),
		.wena(1'b1),
		.aa(raddr),
		.da( {dw{1'b0}} ),
		.oena(~oe),
 
		// write port
		.qb(),
		.clkb(wclk),
		.cenb(~wce),
		.wenb(~we),
		.ab(waddr),
		.db(di),
		.oenb(1'b1)
	);
 
`else
 
`ifdef VENDOR_AVANT
 
	//
	// Instantiation of ASIC memory:
	//
	// Avant! Asynchronous Two-Port RAM
	//
	avant_atp avant_atp(
		.web(~we),
		.reb(),
		.oeb(~oe),
		.rcsb(),
		.wcsb(),
		.ra(raddr),
		.wa(waddr),
		.di(di),
		.do(do)
	);
 
`else
 
`ifdef VENDOR_VIRAGE
 
	//
	// Instantiation of ASIC memory:
	//
	// Virage Synchronous 2-port R/W RAM
	//
	virage_stp virage_stp(
		// read port
		.CLKA(rclk),
		.MEA(rce_a),
		.ADRA(raddr),
		.DA( {dw{1'b0}} ),
		.WEA(1'b0),
		.OEA(oe),
		.QA(do),
 
		// write port
		.CLKB(wclk),
		.MEB(wce),
		.ADRB(waddr),
		.DB(di),
		.WEB(we),
		.OEB(1'b1),
		.QB()
	);
 
`else
 
	//
	// Generic dual-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 & rce) ? do_reg : {dw{1'bz}};
 
	// read operation
	always @(posedge rclk)
		if (rce)
          		do_reg <= #1 (we && (waddr==raddr)) ? {dw{1'b x}} : mem[raddr];
 
	// write operation
	always @(posedge wclk)
		if (wce && we)
			mem[waddr] <= #1 di;
 
 
	// Task prints range of memory
	// *** Remember that tasks are non reentrant, don't call this task in parallel for multiple instantiations.
	task print_ram;
	input [aw-1:0] start;
	input [aw-1:0] finish;
	integer rnum;
  	begin
    		for (rnum=start;rnum<=finish;rnum=rnum+1)
      			$display("Addr %h = %h",rnum,mem[rnum]);
  	end
	endtask
 
`endif // !VENDOR_VIRAGE
`endif // !VENDOR_AVANT
`endif // !VENDOR_ARTISAN
`endif // !VENDOR_ALTERA
`endif // !VENDOR_XILINX
`endif // !VENDOR_FPGA
 
endmodule
 
//
// Black-box modules
//
 
`ifdef VENDOR_ALTERA
	module altera_ram_dp(
		data,
		wraddress,
		rdaddress,
		wren,
		wrclock,
		wrclocken,
		rdclock,
		rdclocken,
		q) /* synthesis black_box */;
 
		parameter awidth = 7;
		parameter dwidth = 8;
 
		input [dwidth -1:0] data;
		input [awidth -1:0] wraddress;
		input [awidth -1:0] rdaddress;
		input               wren;
		input               wrclock;
		input               wrclocken;
		input               rdclock;
		input               rdclocken;
		output [dwidth -1:0] q;
 
		// synopsis translate_off
		// exemplar translate_off
 
		syn_dpram_rowr #(
			"UNUSED",
			dwidth,
			awidth,
			1 << awidth
		)
		altera_dpram_model (
			// read port
			.RdClock(rdclock),
			.RdClken(rdclocken),
			.RdAddress(rdaddress),
			.RdEn(1'b1),
			.Q(q),
 
			// write port
			.WrClock(wrclock),
			.WrClken(wrclocken),
			.WrAddress(wraddress),
			.WrEn(wren),
			.Data(data)
		);
 
		// exemplar translate_on
		// synopsis translate_on
 
	endmodule
`endif // VENDOR_ALTERA
 
`ifdef VENDOR_XILINX
	module xilinx_ram_dp (
		ADDRA,
		CLKA,
		ADDRB,
		CLKB,
		DIA,
		WEA,
		DIB,
		WEB,
		ENA,
		ENB,
		RSTA,
		RSTB,
		DOA,
		DOB) /* synthesis black_box */ ;
 
	parameter awidth = 7;
	parameter dwidth = 8;
 
	// port_a
	input               CLKA;
	input               RSTA;
	input               ENA;
	input [awidth-1:0]  ADDRA;
	input [dwidth-1:0]  DIA;
	input               WEA;
	output [dwidth-1:0] DOA;
 
	// port_b
	input               CLKB;
	input               RSTB;
	input               ENB;
	input [awidth-1:0]  ADDRB;
	input [dwidth-1:0]  DIB;
	input               WEB;
	output [dwidth-1:0] DOB;
 
	// insert simulation model
 
 
	// synopsys translate_off
	// exemplar translate_off
 
	C_MEM_DP_BLOCK_V1_0 #(
		awidth,
		awidth,
		1,
		1,
		"0",
		1 << awidth,
		1 << awidth,
		1,
		1,
		1,
		1,
		1,
		1,
		1,
		1,
		1,
		1,
		1,
		1,
		1,
		"",
		16,
		0,
		0,
		1,
		1,
		1,
		1,
		dwidth,
		dwidth)
	xilinx_dpram_model (
		.ADDRA(ADDRA),
		.CLKA(CLKA),
		.ADDRB(ADDRB),
		.CLKB(CLKB),
		.DIA(DIA),
		.WEA(WEA),
		.DIB(DIB),
		.WEB(WEB),
		.ENA(ENA),
		.ENB(ENB),
		.RSTA(RSTA),
		.RSTB(RSTB),
		.DOA(DOA),
		.DOB(DOB));
 
		// exemplar translate_on
		// synopsys translate_on
 
	endmodule
`endif // VENDOR_XILINX