Verilog code to implement a 4-bit encoder circuit.

Here’s an example Verilog code to implement a 4-bit encoder circuit:

module encoder (output reg [3:0] encoded, input [1:0] select);

    always @(*) begin
        case (select)
            2'b00: encoded = 4'b0001;
            2'b01: encoded = 4'b0010;
            2'b10: encoded = 4'b0100;
            2'b11: encoded = 4'b1000;
        endcase
    end

endmodule

This code defines a module called “encoder” that implements a 4-bit encoder. The output “encoded” is a registered output that represents the encoded value of the input select signal. The input “select” is a 2-bit input that selects one of the four possible output values to be encoded.

The “case” statement is a combinational logic block that calculates the encoded output based on the input select signal. The encoder assigns a 4-bit code to each possible input value of select. When select is 00, the output is 0001. When select is 01, the output is 0010. When select is 10, the output is 0100. When select is 11, the output is 1000.

Note that this Verilog code assumes that the “encoded” output is a 4-bit signal, and the “select” input is a 2-bit signal. If you want to use different signal widths, you would need to modify the code accordingly. Additionally, this code implements a combinational circuit, which means that the output is updated immediately whenever there is a change in the input select signal. If you wanted to implement a registered circuit, you would need to modify the code accordingly.