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 [7:0] Yn;

decoder_38 decoder(
                .E1_n(1'b0),
                .E2_n(1'b0),
                .E3(1'b1)  ,
                .A0(C)     ,
                .A1(B)     ,
                .A2(A)     ,
   
                .Y0_n(Yn[0])   ,  
                .Y1_n(Yn[1])   , 
                .Y2_n(Yn[2])   , 
                .Y3_n(Yn[3])   , 
                .Y4_n(Yn[4])   , 
                .Y5_n(Yn[5])   , 
                .Y6_n(Yn[6])   , 
                .Y7_n(Yn[7])   
);

assign L = ~(Yn[1]&Yn[3]&Yn[6]&Yn[7]);

endmodule