题解 | #异步复位同步释放#

`timescale 1ns/1ns

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

//*************code***********//
reg rst_0,rst_1;
    always@(posedge clk or negedge rst_n)begin
        if(!rst_n)begin
            rst_0<=0;
            rst_1<=0;
        end
        else begin
            rst_0<=rst_n;
            rst_1<=rst_0;
        end
    end

always@(posedge clk or negedge rst_1)begin
    if(!rst_1)
        dout<=0;
    else
        dout<=d;
end
//*************code***********//
endmodule