Bugs case

From HDLBits

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 );
//

     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

Write your solution here

​x
 
1
module top_module (
2
    input [7:0] code,
3
    output reg [3:0] out,
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    output reg valid=1 );//
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​
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     always @(*)
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        case (code)
8
            8'h45: out = 0;
9
            8'h16: out = 1;
10
            8'h1e: out = 2;
11
            8'd26: out = 3;
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            8'h25: out = 4;
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            8'h2e: out = 5;
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            8'h36: out = 6;
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            8'h3d: out = 7;
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            8'h3e: out = 8;
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            6'h46: out = 9;
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            default: valid = 0;
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        endcase
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​
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endmodule
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​
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Solution

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