4 bit two flipflop sychronizer

Discussion in 'VHDL' started by Bhakti Dedhia, Mar 29, 2016.

  1. Bhakti Dedhia

    Bhakti Dedhia

    Mar 29, 2016
    Likes Received:
    Hi i have written the code for 4bit two flip flop synchronizer in verilog.can anyone help in generating the est bench for the same.This code is used for detecting clocking issues like metastability when the clock are operating in different clock domains
    `timescale 1ns / 1ps
    module dff1(data1,clk1,reset1,q1); //Declaration of module ports name
    input [3:0] data1; // Assigninf the ports as i/o ports
    input clk1, reset1 ;
    output reg [3:0] q1;
    initial //initialization of port
    q1= 4'h0; // Declaration of port as a register to store the value
    always @ ( posedge clk1) // positive edge triggering
    if (reset1) begin // reset condition
    q1 = 4'h0;
    q1 = data1;
    #5; //5ns delay
    q1 = 4'h0;

    module ff_syn(d,q,clk1,clk2,rst);
    input clk1,clk2,rst;
    input [3:0] d;
    output [3:0] q;
    wire [3:0] w1,w2; //according to diagram only q3 is the output. if these are also the output just write
    'output' b4 wire
    dff1 f1 (.data1(d), .clk1(clk1),.q1(w1),.reset1(rst));
    dff1 f2 (.data1(w1),.clk1(clk2),.q1(w2),.reset1(rst)); // hierarchy module structure
    dff1 f3 (.data1(w2),.clk1(clk2),.q1(q), .reset1(rst));
    Bhakti Dedhia, Mar 29, 2016
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