module BUF(A, Y); input A; output Y = A; endmodule module NOT(A, Y); input A; output Y = ~A; endmodule module NAND(A, B, Y); input A, B; output Y = ~(A & B); endmodule module NOR(A, B, Y); input A, B; output Y = ~(A | B); endmodule module DFF(C, D, Q); input C, D; output reg Q; always @(posedge C) Q <= D; endmodule module DFFSR(C, D, Q, S, R); input C, D, S, R; output reg Q; always @(posedge C, posedge S, posedge R) if (S) Q <= 1'b1; else if (R) Q <= 1'b0; else Q <= D; endmodule mk/lufa Git repository'/>
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