牛客网--VL74 异步复位同步释放

 对复位信号多打几拍就行

`timescale 1ns/1ns

module ali16(
input clk,
input rst_n,
input d,
output reg dout
 );

//*************code***********//
reg rst0;
reg rst1;

always@(posedge clk or negedge rst_n) begin
    if(!rst_n) begin
        rst0 <= 0;
        rst1 <= 0;
    end
    else begin
        rst0 <= 1;
        rst1 <= rst0;
    end
end

always@(posedge clk or negedge rst1) begin
    if(!rst1)
        dout <= 0;
    else dout <= d;
end

//*************code***********//
endmodule