8-3编码器
编码器是将2n个分离的信息代码以n个二进制码来表示。
8-3编码器的功能真值表
输入sw[n]
输出led[n]
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
0
0
1
0
0
0
1
0
0
0
0
0
1
0
0
0
1
0
0
0
0
0
1
0
0
0
0
1
1
0
0
0
1
0
0
0
0
1
0
0
0
0
1
0
0
0
0
0
1
0
1
0
1
0
0
0
0
0
0
1
1
0
1
0
0
0
0
0
0
0
1
1
1
其它
0
0
0
程序代码：
module encoder8_3( input [7:0] sw, output reg[2:0] led ); always @ (sw) //当sw发生改变时，输出led也跟着改变 begin case(sw) 8'b0000_0001: led = 3'b000 ; 8'b0000_0010: led = 3'b001 ; 8'b0000_0100: led = 3'b010 ; 8'b0000_1000: led = 3'b011 ; 8'b0001_0000: led = 3'b100 ; 8'b0010_0000: led = 3'b101 ; 8'b0100_0000: led = 3'b110 ; 8'b1000_0000: led = 3'b111 ; default: led = 3'b000 ; endcase end endmodule