题解 | 使用3-8译码器①实现逻辑函数

`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 E ;
assign E = E3 & ~E2_n & ~E1_n;
assign  Y0_n = ~(E & ~A2 & ~A1 & ~A0);
assign  Y1_n = ~(E & ~A2 & ~A1 &  A0);
assign  Y2_n = ~(E & ~A2 &  A1 & ~A0);
assign  Y3_n = ~(E & ~A2 &  A1 &  A0);
assign  Y4_n = ~(E &  A2 & ~A1 & ~A0);
assign  Y5_n = ~(E &  A2 & ~A1 &  A0);
assign  Y6_n = ~(E &  A2 &  A1 & ~A0);
assign  Y7_n = ~(E &  A2 &  A1 &  A0);
     
endmodule

module decoder0(
   input             A     ,
   input             B     ,
   input             C     ,
   
   output wire       L
);

wire    Y0_m   ,  
        Y1_m   , 
        Y2_m   , 
        Y3_m   , 
        Y4_m   , 
        Y5_m   , 
        Y6_m   , 
        Y7_m   ;

decoder_38 decoder_38_0(1'b0,1'b0,1'b1, C, B, A, Y0_m, Y1_m, Y2_m, Y3_m, Y4_m, Y5_m, Y6_m, Y7_m);


assign L = ~Y1_m| ~Y3_m| ~Y6_m| ~Y7_m;

endmodule