ddr_cntl_a_fifo_1_wr_en_0.v

arm控制FPGA的DDR测试代码

//////////////////////////////////////////////////////////////////////////////
// Copyright (c) 2005 Xilinx, Inc.
// This design is confidential and proprietary of Xilinx, All Rights Reserved.
///////////////////////////////////////////////////////////////////////////////
//   ____  ____
//  /   /\/   /
// /___/  \  / Vendor: Xilinx
// \   \   \/ Version: 1.6
//  \   \    Application : MIG
//  /   /    Filename: ddr_cntl_a_fifo_1_wr_en_0.v
// /___/   /\ Date Last Modified:  Tue Jul 11 2006
// \   \  /  \ Date Created: Mon May 2 2005
//  \___\/\___\
// Device: Spartan-3/3e
// Design Name: DDR1_S3/S3e
// Description: It generates the write enable signal for the fifos
///////////////////////////////////////////////////////////////////////////////


`timescale 1ns/100ps
module ddr_cntl_a_fifo_1_wr_en_0 ( clk,
                      rst_dqs_delay_n,
                      reset,
                      din,
                      dout);

   input clk;
   input rst_dqs_delay_n;
   input reset;
   input din;
   output dout;


   wire din_delay;
   wire din_delay_1;
   wire dout0;
   wire rst_dqs_delay;

   parameter TIE_HIGH = 1'b1;

   assign rst_dqs_delay = ~rst_dqs_delay_n;
   assign dout0 = din & rst_dqs_delay_n;
   assign dout = rst_dqs_delay | din_delay_1;

   FDCE delay_ff_1 (.Q(din_delay_1), .C(clk), .CE(TIE_HIGH), .CLR(reset), .D(dout0));



endmodule