题解 | #优先编码器电路①#
https://www.nowcoder.com/practice/0594ed5303ad48a19aed90bc48839d00
`timescale 1ns/1ns
module encoder_0(
input [8:0] I_n ,
output reg [3:0] Y_n
);
always@(*) begin : encoder
casex (I_n)
9'b1_1111_1111: Y_n = 4'b1111;
9'b0_xxxx_xxxx: Y_n = 4'b0110;
9'b1_0xxx_xxxx: Y_n = 4'b0111;
9'b1_10xx_xxxx: Y_n = 4'b1000;
9'b1_110x_xxxx: Y_n = 4'b1001;
9'b1_1110_xxxx: Y_n = 4'b1010;
9'b1_1111_0xxx: Y_n = 4'b1011;
9'b1_1111_10xx: Y_n = 4'b1100;
9'b1_1111_110x: Y_n = 4'b1101;
9'b1_1111_1110: Y_n = 4'b1110;
default: Y_n = 4'b1111;
endcase
end
endmodule
module encoder_0(
input [8:0] I_n ,
output reg [3:0] Y_n
);
always@(*) begin : encoder
casex (I_n)
9'b1_1111_1111: Y_n = 4'b1111;
9'b0_xxxx_xxxx: Y_n = 4'b0110;
9'b1_0xxx_xxxx: Y_n = 4'b0111;
9'b1_10xx_xxxx: Y_n = 4'b1000;
9'b1_110x_xxxx: Y_n = 4'b1001;
9'b1_1110_xxxx: Y_n = 4'b1010;
9'b1_1111_0xxx: Y_n = 4'b1011;
9'b1_1111_10xx: Y_n = 4'b1100;
9'b1_1111_110x: Y_n = 4'b1101;
9'b1_1111_1110: Y_n = 4'b1110;
default: Y_n = 4'b1111;
endcase
end
endmodule
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