4x1 Mux Gate Level Code Example


Example: 4 to 1 5 bit mux

module mux_4to1_assign ( input [3:0] a,                 // 4-bit input called a                          input [3:0] b,                 // 4-bit input called b                          input [3:0] c,                 // 4-bit input called c                          input [3:0] d,                 // 4-bit input called d                          input [1:0] sel,               // input sel used to select between a,b,c,d                          output [3:0] out);             // 4-bit output based on input sel     // When sel[1] is 0, (sel[0]? b:a) is selected and when sel[1] is 1, (sel[0] ? d:c) is taken    // When sel[0] is 0, a is sent to output, else b and when sel[0] is 0, c is sent to output, else d    assign out = sel[1] ? (sel[0] ? d : c) : (sel[0] ? b : a);  endmodule

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