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73. SR Latch

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Solving Approach

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Code

module sr_latch_nor (
    input  S,
    input  R,
    output reg Q,
    output reg Qn
);

    always @(*) begin
        if (S && R) begin
            // Illegal case → deterministic reset
            Q  <= 1'b0;
            Qn <= 1'b1;
        end
        else if (S && !R) begin
            // Set
            Q  <= 1'b1;
            Qn <= 1'b0;
        end
        else if (!S && R) begin
            // Reset
            Q  <= 1'b0;
            Qn <= 1'b1;
        end
       
    end

endmodule
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