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//////////////////////////////////////////////////////////////////////
//// ////
//// File name "generic_mem_small.v" ////
//// ////
//// This file is part of the "10GE MAC" project ////
//// http://www.opencores.org/cores/xge_mac/ ////
//// ////
//// Author(s): ////
//// - A. Tanguay (antanguay@opencores.org) ////
//// ////
//////////////////////////////////////////////////////////////////////
//// ////
//// Copyright (C) 2008 AUTHORS. All rights reserved. ////
//// ////
//// 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 ////
//// ////
//////////////////////////////////////////////////////////////////////
module generic_mem_small(
wclk,
wrst_n,
wen,
waddr,
wdata,
rclk,
rrst_n,
ren,
roen,
raddr,
rdata
);
//---
// Parameters
parameter DWIDTH = 32;
parameter AWIDTH = 3;
parameter RAM_DEPTH = (1 << AWIDTH);
parameter SYNC_WRITE = 1;
parameter SYNC_READ = 1;
parameter REGISTER_READ = 0;
//---
// Ports
input wclk;
input wrst_n;
input wen;
input [AWIDTH:0] waddr;
input [DWIDTH-1:0] wdata;
input rclk;
input rrst_n;
input ren;
input roen;
input [AWIDTH:0] raddr;
output [DWIDTH-1:0] rdata;
// Registered outputs
reg [DWIDTH-1:0] rdata;
//---
// Local declarations
// Registers
reg [DWIDTH-1:0] mem_rdata;
// Memory
(* ram_style = "block" *) reg [DWIDTH-1:0] mem [0:RAM_DEPTH-1];
// Variables
integer i;
//---
// Memory Write
generate
if (SYNC_WRITE) begin
// Generate synchronous write
always @(posedge wclk)
begin
if (wen) begin
mem[waddr[AWIDTH-1:0]] <= wdata;
end
end
end
else begin
// Generate asynchronous write
always @(wen, waddr, wdata)
begin
if (wen) begin
mem[waddr[AWIDTH-1:0]] = wdata;
end
end
end
endgenerate
//---
// Memory Read
generate
if (SYNC_READ) begin
// Generate registered memory read
always @(posedge rclk /* IJB or negedge rrst_n */)
begin
if (!rrst_n) begin
mem_rdata <= {(DWIDTH){1'b0}};
end else if (ren) begin
mem_rdata <= mem[raddr[AWIDTH-1:0]];
end
end
end
else begin
// Generate unregisters memory read
always @(raddr, rclk)
begin
mem_rdata = mem[raddr[AWIDTH-1:0]];
end
end
endgenerate
generate
if (REGISTER_READ) begin
// Generate registered output
always @(posedge rclk /* IJB or negedge rrst_n*/)
begin
if (!rrst_n) begin
rdata <= {(DWIDTH){1'b0}};
end else if (roen) begin
rdata <= mem_rdata;
end
end
end
else begin
// Generate unregisters output
always @(mem_rdata)
begin
rdata = mem_rdata;
end
end
endgenerate
endmodule
|
