行為模式 二位元多工器

邏輯閘

二位元多工器

module top;

wire [1:0]A, B,OUT

wire SEL;

system_clock #100 clock1(A[0]);

system_clock #100 clock1(A[1]);

system_clock #200 clock2(B[0]);

system_clock #200 clock1(B[1]);

system_clock #400 clock3(SEL);

mux2 M1  (OUT, A, B, SEL);

endmodule

module mux(OUT, A, B, SEL);

output OUT;

input A,B,SEL;

not I5 (sel_n, SEL) ;

and I6 (sel_a, A, SEL);

and I7 (sel_b, sel_n, B);

or I4 (OUT, sel_a, sel_b);

endmodule

module mux2(OUT, A, B, SEL);

output [1:0] OUT;

input [1:0] A,B;

input SEL;

mux hi (OUT[1], A[1], B[1], SEL);

mux lo (OUT[0], A[0], B[0], SEL);

endmodule

module system_clock(clk);

parameter PERIOD=100;

output clk;

reg clk;

initial clk=0;

always

 begin

#(PERIOD/2) clk=~clk;

 end

always@(posedge clk)

 if($time>1000)$stop;

endmodule

一位元多工器

3輸入 1-NOT 2-AND 1-OR 多工器

module top;

wire A, B, SEL,OUT
system_clock #400 clock1(A);
system_clock #200 clock2(B);
system_clock #100 clock3(SEL);

not I5 (sel_n, SEL) ;
and I6 (sel_a, A, SEL);
and I7 (sel_b, sel_n, B);
or I4 (OUT, sel_a, sel_b);
endmodule

module system_clock(clk);
parameter PERIOD=100;
output clk;
reg clk;

initial clk=0;

always
 begin
#(PERIOD/2) clk=~clk;
 end

always@(posedge clk)
 if($time>1000)$stop;

endmodule