ansy_fifo_top.v

多时钟域下同步逻辑的RTL代码（包括数据同步器和控制信号万能同步器）

/*************************************************
 *		模块名：asyn_fifo_top
 *		时  间：2007-05-14
 *    设计者：张波涛
 *    说  明：FIFO的顶层模块
 *************************************************/
 
// `include "timescale.v"
 
module asyn_fifo_top(
	rdata,			//FIFO读数据总线
	wfull,         //FIFO满信号
	rempty,        //FIFO空信号
	wdata,         //FIFO写数据总线
	winc,          //写请求信号
	wclk,          //写时钟
	wrst_n,        //写时钟域复位信号
	rinc,          //读请求信号
	rclk,          //读时钟
	rrst_n         //读时钟域复位信号
	);

  parameter DSIZE = 32;
  parameter ASIZE = 3;
  
  output [DSIZE - 1: 0] rdata;
  output wfull;
  output rempty;
  
  input  [DSIZE -1:0]	wdata;
  input  winc,wclk,wrst_n;
  input  rinc,rclk,rrst_n;
  
  wire  [ASIZE -1:0]	waddr,raddr;
  wire  [ASIZE :0]	wptr,rptr,wrptr2,rwptr2;
  
  sync_r2w #(ASIZE) sync_r2w
                  (.wrptr2(wrptr2),
                   .rptr(rptr),
                   .wclk(wclk),
                   .wrst_n(wrst_n));
                   
  sync_w2r #(ASIZE) sync_w2r
                 (.rwptr2(rwptr2),
                  .wptr(wptr),
                  .rclk(rclk),
                  .rrst_n(rrst_n));
                  
  fifomem #(DSIZE,ASIZE) fifomem(
                                 .rdata(rdata),
                                 .wdata(wdata),
                                 .waddr(waddr),
                                 .raddr(raddr),
                                 .wclken(winc),
                                 .wclk(wclk));
                                 
  rptr_empty #(ASIZE) rptr_empty(
                                 .rempty(rempty),
                                 .raddr(raddr),
                                 .rptr(rptr),
                                 .rwptr2(rwptr2),
                                 .rinc(rinc),
                                 .rclk(rclk),
                                 .rrst_n(rrst_n));
                                 
  wptr_full #(ASIZE) wptr_full(
                               .wfull(wfull),
                               .waddr(waddr),
                               .wptr(wptr),
                               .wrptr2(wrptr2),
                               .winc(winc),
                               .wclk(wclk),
                               .wrst_n(wrst_n));
                               
  endmodule