题解 | #优先编码器Ⅰ#
优先编码器Ⅰ
https://www.nowcoder.com/practice/a7068b8f4c824d6a9592f691990b21de
`timescale 1ns/1ns
module encoder_83(
input [7:0] I ,
input EI ,
output wire [2:0] Y ,
output wire GS ,
output wire EO
);
wire [8:0] check;
reg [2:0] Y_r;
reg GS_r,EO_r;
assign GS = GS_r;
assign EO = EO_r;
assign Y = Y_r;
assign check = {EI,I};
always@(*)
begin
casex(check)
9'b0_xxxx_xxxx: begin Y_r=3'b000; GS_r=1'b0; EO_r=1'b0; end
9'b1_0000_0000: begin Y_r=3'b000; GS_r=1'b0; EO_r=1'b1; end
9'b1_1xxx_xxxx: begin Y_r=3'b111; GS_r=1'b1; EO_r=1'b0; end
9'b1_01xx_xxxx: begin Y_r=3'b110; GS_r=1'b1; EO_r=1'b0; end
9'b1_001x_xxxx: begin Y_r=3'b101; GS_r=1'b1; EO_r=1'b0; end
9'b1_0001_xxxx: begin Y_r=3'b100; GS_r=1'b1; EO_r=1'b0; end
9'b1_0000_1xxx: begin Y_r=3'b011; GS_r=1'b1; EO_r=1'b0; end
9'b1_0000_01xx: begin Y_r=3'b010; GS_r=1'b1; EO_r=1'b0; end
9'b1_0000_001x: begin Y_r=3'b001; GS_r=1'b1; EO_r=1'b0; end
9'b1_0000_0001: begin Y_r=3'b000; GS_r=1'b1; EO_r=1'b0; end
default:begin Y_r=3'b000; GS_r=1'b0; EO_r=1'b0; end
endcase
end
endmodule
