题解 | #优先编码器Ⅰ#

`timescale 1ns/1ns

module encoder_83(
   input      [7:0]       I   ,
   input                  EI  ,
   
   output wire [2:0]      Y   ,
   output wire            GS  ,
   output wire            EO    
);


reg [2:0] YR;
reg GSR,EOR;

always @(*)(1444584) begin 

if(!EI) begin
YR=0;
GSR=0;
EOR=0;
end
else if(I==0) begin
    YR=0;
    GSR=0;
    EOR=1;
end
else begin
    GSR=1;
    EOR=0;

    casex(I)
    8'b1XXXXXXX: YR=3'b111;
    8'b01XXXXXX: YR=3'b110;
    8'b001XXXXX: YR=3'b101;
    8'b0001XXXX: YR=3'b100;
    8'b00001XXX: YR=3'b011;
    8'b000001XX: YR=3'b010;
    8'b0000001X: YR=3'b001;
    8'b00000001: YR=3'b000;
    endcase
end

end


assign Y=YR;
assign GS=GSR;
assign EO=EOR;

endmodule