Subversion Repositories an-fpga-implementation-of-low-latency-noc-based-mpsoc

/******************************************************************************
 This Source Code Form is subject to the terms of the
 Open Hardware Description License, v. 1.0. If a copy
 of the OHDL was not distributed with this file, You
 can obtain one at http://juliusbaxter.net/ohdl/ohdl.txt
 
 Description: True dual port ram with single clock
 
 Copyright (C) 2013 Stefan Kristiansson <stefan.kristiansson@saunalahti.fi>
 
 ******************************************************************************/
 
module mor1kx_true_dpram_sclk
  #(
    parameter ADDR_WIDTH = 32,
    parameter DATA_WIDTH = 32
    )
   (
    input 		    clk,
    input [ADDR_WIDTH-1:0]  addr_a,
    input 		    we_a,
    input [DATA_WIDTH-1:0]  din_a,
    output [DATA_WIDTH-1:0] dout_a,
    input [ADDR_WIDTH-1:0]  addr_b,
    input 		    we_b,
    input [DATA_WIDTH-1:0]  din_b,
    output [DATA_WIDTH-1:0] dout_b
    );
 
   reg [DATA_WIDTH-1:0]     mem[(1<<ADDR_WIDTH)-1:0];
 
   reg [DATA_WIDTH-1:0]     rdata_a;
   reg [DATA_WIDTH-1:0]     rdata_b;
 
   assign dout_a = rdata_a;
   assign dout_b = rdata_b;
 
   always @(posedge clk) begin
      if (we_a) begin
	 mem[addr_a] <= din_a;
	 rdata_a <= din_a;
      end else begin
	 rdata_a <= mem[addr_a];
      end
   end
 
   always @(posedge clk) begin
      if (we_b) begin
	 mem[addr_b] <= din_b;
	 rdata_b <= din_b;
      end else begin
	 rdata_b <= mem[addr_b];
      end
   end
 
endmodule