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74. Gated SR Latch

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Solving Approach

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Code

module sr_latch_enable (
    input  EN,
    input  S,
    input  R,
    output Q,
    output Qn
);
	// Write your code here
	reg Q_reg; 
    reg Qn_reg; 
    always @* begin
        if (EN) begin  
            if (S && R) begin   
                Q_reg  = 1'b0; // illegal -> reset
                Qn_reg = 1'b1;
            end else if (S && !R) begin 
                Q_reg  = 1'b1; // set
                Qn_reg = 1'b0;
            end else if (!S && R) begin
                Q_reg = 1'b0;
                Qn_reg = 1'b1; 
            end
        end
    end
    assign Q = Q_reg;
    assign Qn = Qn_reg;
endmodule

 

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