一、2-4译码器
1 module Decode_2_4
2 (
3 input [1:0] indata,
4 input enable_n,
5 output reg [3:0] outdata
6 );
7
8 always @(*)begin
9 if(enable_n == 1'b1)
10 outdata = 4'b1111;
11 else begin
12 case(indata)
13 2'b00: outdata = 4'b1110;
14 2'b01: outdata = 4'b1101;
15 2'b10: outdata = 4'b1011;
16 2'b11: outdata = 4'b0111;
17 endcase
18 end
19 end
20
21 endmodule
二、BCD译码器
1 module Decode_4_10
2 (
3 input [3:0] indata,
4 output reg [9:0] outdata
5 );
6
7 always @(*)begin
8 case(indata)
9 4'b0000: outdata = 10'b1111_1111_10;
10 4'b0001: outdata = 10'b1111_1111_01;
11 4'b0010: outdata = 10'b1111_1110_11;
12 4'b0011: outdata = 10'b1111_1101_11;
13 4'b0100: outdata = 10'b1111_1011_11;
14 4'b0101: outdata = 10'b1111_0111_11;
15 4'b0110: outdata = 10'b1110_1111_11;
16 4'b0111: outdata = 10'b1101_1111_11;
17 4'b1000: outdata = 10'b1011_1111_11;
18 4'b1001: outdata = 10'b0111_1111_11;
19 default: outdata = 10'b1111_1111_11;
20 endcase
21 end
22
23 endmodule
