HBLbits_Verilog Basic_Bugs case

HBLbits_Verilog Basic_Bugs case

 This combinational circuit is supposed to recognize 8-bit keyboard scancodes for keys 0 through 9. It should indicate whether one of the 10 cases were recognized (valid), and if so, which key was detected. Fix the bug(s).

Module Declaration

module top_module (
    input [7:0] code,
    output reg [3:0] out,
    output reg valid=1 );

module top_module (
    input [7:0] code,
    output reg [3:0] out,
    output reg valid=1 );//
     always @(*)
        case (code)
            8'h45: out = 0;
            8'h16: out = 1;
            8'h1e: out = 2;
            8'd26: out = 3;
            8'h25: out = 4;
            8'h2e: out = 5;
            8'h36: out = 6;
            8'h3d: out = 7;
            8'h3e: out = 8;
            6'h46: out = 9;
            default: valid = 0;
        endcase
endmodule

module top_module (
    input [7:0] code,
    output reg [3:0] out,
    output reg valid
);//
    always @(*)begin
out = 0;
valid = 1;
        case (code)
            8'h45: out = 0;
            8'h16: out = 1;
            8'h1e: out = 2;
            8'h26: out = 3;
            8'h25: out = 4;
            8'h2e: out = 5;
            8'h36: out = 6;
            8'h3d: out = 7;
            8'h3e: out = 8;
            8'h46: out = 9;
            default: valid = 0;
        endcase
    end
endmodule