[HDLBits] Dff8ar

Create 8 D flip-flops with active high asynchronous reset. All DFFs should be triggered by the positive edge of clk.

module top_module (
    input clk,
    input areset,   // active high asynchronous reset
    input [7:0] d,
    output [7:0] q
);
    always@(posedge clk or posedge areset) begin
        if(areset)
            q<=8'd0;
        else
            q<=d;
    end
endmodule

异步就是在always敏感列表里加上对应的reset，同步不用加