题解 | #使用8线-3线优先编码器Ⅰ实现16线-4线优先编码器#

输入的16位信号的高8位、低8位分别输入到两个8-3编码器中，高8位的编码器GS端接Y[3]、EO端接低8位的编码器的EI端。

上代码：

`timescale 1ns/1ns
module encoder_83(
   input      [7:0]       I   ,
   input                  EI  ,
   
   output wire [2:0]      Y   ,
   output wire            GS  ,
   output wire            EO    
);
assign Y[2] = EI & (I[7] | I[6] | I[5] | I[4]);
assign Y[1] = EI & (I[7] | I[6] | ~I[5]&~I[4]&I[3] | ~I[5]&~I[4]&I[2]);
assign Y[0] = EI & (I[7] | ~I[6]&I[5] | ~I[6]&~I[4]&I[3] | ~I[6]&~I[4]&~I[2]&I[1]);

assign EO = EI&~I[7]&~I[6]&~I[5]&~I[4]&~I[3]&~I[2]&~I[1]&~I[0];

assign GS = EI&(I[7] | I[6] | I[5] | I[4] | I[3] | I[2] | I[1] | I[0]);
//assign GS = EI&(| I);
         
endmodule

module encoder_164(
   input      [15:0]      A   ,
   input                  EI  ,
   
   output wire [3:0]      L   ,
   output wire            GS  ,
   output wire            EO    
);
    
    wire[2:0] Y0;
    wire[2:0] Y1;
    wire GS0;
    wire GS1;
    wire EO0;
    wire EO1;
    
    encoder_83 u0(A[15:8],EI,Y0,GS0,EO0);
    
    encoder_83 u1(A[7:0],EO0,Y1,GS1,EO1);
    
    assign L= {GS0,Y0[2]|Y1[2],Y0[1]|Y1[1],Y0[0]|Y1[0]};
    assign GS=(GS1|GS0)&EI;
    assign EO =EO0 & EO1;
    
  
  
endmodule