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_n;
    wire Y1_n;
    wire Y2_n;
    wire Y3_n;
    wire Y4_n;
    wire Y5_n;
    wire Y6_n;
    wire Y7_n;

    decoder_38 u_decoder_38(
        .E1_n(0)   ,
        .E2_n(0)   ,
        .E3(1)     ,
        
        .A0(C)     ,
        .A1(B)     ,
        .A2(A)     ,
        
        .Y0_n(Y0_n)    ,  
        .Y1_n(Y1_n)    , 
        .Y2_n(Y2_n)    , 
        .Y3_n(Y3_n)    , 
        .Y4_n(Y4_n)    , 
        .Y5_n(Y5_n)    , 
        .Y6_n(Y6_n)    , 
        .Y7_n(Y7_n)    
        );

    assign L = ~Y1_n | ~Y3_n | ~Y6_n | ~Y7_n;

endmodule