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Four input gates

Problem statement

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.
Verilog
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module top_module( 
    input [3:0] in,
    output out_and,
    output out_or,
    output out_xor
);

endmodule

Solution

Verilog
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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