80. DFF with Async Reset and Preset

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Ayuyu

February 26, 2026

Solving Approach

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Code

module dff_async_reset_preset (
    input  CLK,
    input  RST,
    input  PRE,
    input  D,
    output reg Q
);

always @(posedge CLK, posedge RST, posedge PRE ) begin
    if (RST) begin
        Q <= 0;
    end else begin
        if (PRE) begin
            Q <= 1;
        end else begin
            Q <= D;
        end
    end
end

endmodule

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