[HDLBits] Gates4

Build a combinational circuit with four inputs, in[3:0].

There are 3 outputs:

• out_and: output of a 4-input AND gate.
• out_or: output of a 4-input OR gate.
• out_xor: output of a 4-input XOR gate.

module top_module( 
    input [3:0] in,
    output out_and,
    output out_or,
    output out_xor
);
    assign out_and = in[3]&&in[2]&&in[1]&&in[0];
    assign out_or = in[3]||in[2]||in[1]||in[0];
    assign out_xor = in[3]^in[2]^in[1]^in[0];
endmodule

按位异或符号：^

没有逻辑异或