Verilog code to implement a 4-bit priority encoder circuit.

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

module priority_encoder (output reg [1:0] encoded, input [3:0] data);

    always @(*) begin
        casez (data)
            4'b0000: encoded = 2'b00;
            4'b0001: encoded = 2'b01;
            4'b0010: encoded = 2'b10;
            default:  encoded = 2'b11;
        endcase
    end

endmodule

This code defines a module called “priority_encoder” that implements a 4-bit priority encoder. The output “encoded” is a registered output that represents the encoded priority of the input data. The input “data” is a 4-bit input that represents the data to be encoded.

The “casez” statement is a combinational logic block that calculates the encoded output based on the input data. The priority encoder assigns a 2-bit code to the input data based on its highest priority bit. If the highest priority bit is 0, the output is 00. If the highest priority bit is 1 in bit 3, the output is 01. If the highest priority bit is 1 in bit 2, the output is 10. If the highest priority bit is 1 in bit 1 or bit 0, the output is 11.

Note that this Verilog code assumes that the “encoded” output is a 2-bit signal, and the “data” input is a 4-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 data. If you wanted to implement a registered circuit, you would need to modify the code accordingly.