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48 lines
881 B
Text
48 lines
881 B
Text
module dff1 (D, CLK, Q);
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reg IQ, IQN;
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input D;
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input CLK;
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output Q;
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assign Q = IQ; // IQ
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always @(posedge CLK) begin
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// (~D)
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IQ <= (~D);
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end
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always @(posedge CLK) begin
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// ~((~D))
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IQN <= ~((~D));
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end
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endmodule
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module dff2 (D, CLK, Q);
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reg IQ, IQN;
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input D;
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input CLK;
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output Q;
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assign Q = IQ; // "IQ"
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always @(posedge CLK) begin
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// (~D)
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IQ <= (~D);
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end
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always @(posedge CLK) begin
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// ~((~D))
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IQN <= ~((~D));
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end
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endmodule
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module dffe (D, EN, CLK, Q, QN);
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reg IQ, IQN;
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input D;
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input EN;
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input CLK;
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output Q;
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assign Q = IQ; // "IQ"
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output QN;
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assign QN = IQN; // "IQN"
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always @(negedge CLK) begin
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// ((D&EN)|(IQ&(~EN)))
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IQ <= ((D&EN)|(IQ&(~EN)));
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end
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always @(negedge CLK) begin
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// ~(((D&EN)|(IQ&(~EN))))
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IQN <= ~(((D&EN)|(IQ&(~EN))));
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end
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endmodule
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