题解 | #实现3-8译码器①#

`timescale 1ns/1ns

module decoder_38(
   input             E1_n   ,
   input             E2_n   ,
   input             E3     ,
   input             A0     ,
   input             A1     ,
   input             A2     ,
   
   output wire       Y0_n   ,  
   output wire       Y1_n   , 
   output wire       Y2_n   , 
   output wire       Y3_n   , 
   output wire       Y4_n   , 
   output wire       Y5_n   , 
   output wire       Y6_n   , 
   output wire       Y7_n   
);

wire            En;
wire    [7:0]   y;

assign  En = E3 & ~E2_n & ~E1_n;
assign  y = {8{En}} & {  A2 &  A1 &  A0 ,
                         A2 &  A1 & ~A0 ,
                         A2 & ~A1 &  A0 ,
                         A2 & ~A1 & ~A0 ,
                        ~A2 &  A1 &  A0 ,
                        ~A2 &  A1 & ~A0 ,
                        ~A2 & ~A1 &  A0 ,
                        ~A2 & ~A1 & ~A0  };

assign  {Y7_n,Y6_n,Y5_n,Y4_n,Y3_n,Y2_n,Y1_n,Y0_n} = ~ y[7:0];

endmodule