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//Sumator pentru un multiplexor cu 4 intrari si o iesire(MUX 4:1)
module sumator(out,i0,i1,i2,i3,s0,s1); //declar iesiri finale apoi intrari
input i0,i1,i2,i3,s0,s1; //declaratia intrarilor
output out; //declaratia iesirii
assign out= ((~s0&~s1&i0)|(~s0&s1&i1)|(s0&s1&i2)|(s0&s1&i3));
endmodule
module simulare; //modulul de simulare
reg i0,i1,i2,i3,s0,s1; //declar registrii adica intrarile
wire out; //de tip wire sunt iesirile- in cazul de fata am o singura iesire notata out
sumator x1(out,i0,i1,i2,i3,s0,s1); //apelul modulului sumator- intai se trec iesirile, apoi intrarile
initial
begin
// se iau toate combinatiile posibile de biti
i0=1'b0; i1=1'b0; i2=1'b0; i3=1'b0; s0=1'b0; s1=1'b0; //combinatia 0000
#5 i0=1'b0; i1=1'b0; i2=1'b0; i3=1'b1; s0=1'b0; s1=1'b0; //combinatia 0001
#5 i0=1'b0; i1=1'b0; i2=1'b1; i3=1'b0; s0=1'b0; s1=1'b0; //combinatia 0010
#5 i0=1'b0; i1=1'b0; i2=1'b1; i3=1'b1; s0=1'b0; s1=1'b0; //combinatia 0011
#5 i0=1'b0; i1=1'b1; i2=1'b0; i3=1'b0; s0=1'b0; s1=1'b0; //combinatia 0100
#5 i0=1'b0; i1=1'b1; i2=1'b0; i3=1'b1; s0=1'b0; s1=1'b0; //combinatia 0101
#5 i0=1'b0; i1=1'b1; i2=1'b1; i3=1'b0; s0=1'b0; s1=1'b0; //combinatia 0110
#5 i0=1'b0; i1=1'b1; i2=1'b1; i3=1'b1; s0=1'b0; s1=1'b0; //combinatia 0111
#5 i0=1'b1; i1=1'b0; i2=1'b0; i3=1'b0; s0=1'b0; s1=1'b0; //combinatia 1000
#5 i0=1'b1; i1=1'b0; i2=1'b0; i3=1'b1; s0=1'b0; s1=1'b0; //combinatia 1001
#5 i0=1'b1; i1=1'b0; i2=1'b1; i3=1'b0; s0=1'b0; s1=1'b0; //combinatia 1010
#5 i0=1'b1; i1=1'b0; i2=1'b1; i3=1'b1; s0=1'b0; s1=1'b0; //combinatia 1011
#5 i0=1'b1; i1=1'b1; i2=1'b0; i3=1'b0; s0=1'b0; s1=1'b0; //combinatia 1100
#5 i0=1'b1; i1=1'b1; i2=1'b0; i3=1'b1; s0=1'b0; s1=1'b0; //combinatia 1101
#5 i0=1'b1; i1=1'b1; i2=1'b1; i3=1'b0; s0=1'b0; s1=1'b0; //combinatia 1110
#5 i0=1'b1; i1=1'b1; i2=1'b1; i3=1'b1; s0=1'b0; s1=1'b0; //combinatia 1111
#5 i0=1'b0; i1=1'b0; i2=1'b0; i3=1'b0; s0=1'b0; s1=1'b1; //combinatia 0000
#5 i0=1'b0; i1=1'b0; i2=1'b0; i3=1'b1; s0=1'b0; s1=1'b1; //combinatia 0010
#5 i0=1'b0; i1=1'b0; i2=1'b1; i3=1'b0; s0=1'b0; s1=1'b1; //combinatia 0011
#5 i0=1'b0; i1=1'b0; i2=1'b1; i3=1'b1; s0=1'b0; s1=1'b1; //combinatia 0100
#5 i0=1'b0; i1=1'b1; i2=1'b0; i3=1'b0; s0=1'b0; s1=1'b1; //combinatia 0101
#5 i0=1'b0; i1=1'b1; i2=1'b0; i3=1'b1; s0=1'b0; s1=1'b1; //combinatia 0110
#5 i0=1'b0; i1=1'b1; i2=1'b1; i3=1'b0; s0=1'b0; s1=1'b1; //combinatia 0111
#5 i0=1'b0; i1=1'b1; i2=1'b1; i3=1'b1; s0=1'b0; s1=1'b1; //combinatia 1000
#5 i0=1'b1; i1=1'b0; i2=1'b0; i3=1'b0; s0=1'b0; s1=1'b1; //combinatia 1001
#5 i0=1'b1; i1=1'b0; i2=1'b0; i3=1'b1; s0=1'b0; s1=1'b1; //combinatia 1010
#5 i0=1'b1; i1=1'b0; i2=1'b1; i3=1'b0; s0=1'b0; s1=1'b1; //combinatia 1011
#5 i0=1'b1; i1=1'b0; i2=1'b1; i3=1'b1; s0=1'b0; s1=1'b1; //combinatia 1100
#5 i0=1'b1; i1=1'b1; i2=1'b0; i3=1'b0; s0=1'b0; s1=1'b1; //combinatia 1101
#5 i0=1'b1; i1=1'b1; i2=1'b0; i3=1'b1; s0=1'b0; s1=1'b1; //combinatia 1110
#5 i0=1'b1; i1=1'b1; i2=1'b1; i3=1'b0; s0=1'b0; s1=1'b1; //combinatia 1110
#5 i0=1'b1; i1=1'b1; i2=1'b1; i3=1'b1; s0=1'b0; s1=1'b1; //combinatia 1111
//se mai repeta acelasi lucru inca o data deoarece avem un sumator pe 2biti
#5 i0=1'b0; i1=1'b0; i2=1'b0; i3=1'b0; s0=1'b1; s1=1'b0;
#5 i0=1'b0; i1=1'b0; i2=1'b0; i3=1'b1; s0=1'b1; s1=1'b0;
#5 i0=1'b0; i1=1'b0; i2=1'b1; i3=1'b1; s0=1'b1; s1=1'b0;
#5 i0=1'b0; i1=1'b1; i2=1'b0; i3=1'b0; s0=1'b1; s1=1'b0;
#5 i0=1'b0; i1=1'b1; i2=1'b0; i3=1'b1; s0=1'b1; s1=1'b0;
#5 i0=1'b0; i1=1'b1; i2=1'b1; i3=1'b0; s0=1'b1; s1=1'b0;
#5 i0=1'b0; i1=1'b1; i2=1'b1; i3=1'b1; s0=1'b1; s1=1'b0;
#5 i0=1'b1; i1=1'b0; i2=1'b0; i3=1'b0; s0=1'b1; s1=1'b0;
#5 i0=1'b1; i1=1'b0; i2=1'b0; i3=1'b1; s0=1'b1; s1=1'b0;
#5 i0=1'b1; i1=1'b0; i2=1'b1; i3=1'b0; s0=1'b1; s1=1'b0;
#5 i0=1'b1; i1=1'b0; i2=1'b1; i3=1'b1; s0=1'b1; s1=1'b0;
#5 i0=1'b1; i1=1'b1; i2=1'b0; i3=1'b0; s0=1'b1; s1=1'b0;
#5 i0=1'b1; i1=1'b1; i2=1'b0; i3=1'b1; s0=1'b1; s1=1'b0;
#5 i0=1'b1; i1=1'b1; i2=1'b1; i3=1'b0; s0=1'b1; s1=1'b0;
#5 i0=1'b1; i1=1'b1; i2=1'b1; i3=1'b1; s0=1'b1; s1=1'b0;
#5 i0=1'b0; i1=1'b0; i2=1'b0; i3=1'b0; s0=1'b1; s1=1'b1;
#5 i0=1'b0; i1=1'b0; i2=1'b0; i3=1'b1; s0=1'b1; s1=1'b1;
#5 i0=1'b0; i1=1'b0; i2=1'b1; i3=1'b0; s0=1'b1; s1=1'b1;
#5 i0=1'b0; i1=1'b0; i2=1'b1; i3=1'b1; s0=1'b1; s1=1'b1;
#5 i0=1'b0; i1=1'b1; i2=1'b0; i3=1'b0; s0=1'b1; s1=1'b1;
#5 i0=1'b0; i1=1'b1; i2=1'b0; i3=1'b1; s0=1'b1; s1=1'b1;
#5 i0=1'b0; i1=1'b1; i2=1'b1; i3=1'b0; s0=1'b1; s1=1'b1;
#5 i0=1'b0; i1=1'b1; i2=1'b1; i3=1'b1; s0=1'b1; s1=1'b1;
#5 i0=1'b1; i1=1'b0; i2=1'b0; i3=1'b0; s0=1'b1; s1=1'b1;
#5 i0=1'b1; i1=1'b0; i2=1'b0; i3=1'b1; s0=1'b1; s1=1'b1;
#5 i0=1'b1; i1=1'b0; i2=1'b1; i3=1'b0; s0=1'b1; s1=1'b1;
#5 i0=1'b1; i1=1'b0; i2=1'b1; i3=1'b1; s0=1'b1; s1=1'b1;
#5 i0=1'b1; i1=1'b1; i2=1'b0; i3=1'b0; s0=1'b1; s1=1'b1;
#5 i0=1'b1; i1=1'b1; i2=1'b0; i3=1'b1; s0=1'b1; s1=1'b1;
#5 i0=1'b1; i1=1'b1; i2=1'b1; i3=1'b0; s0=1'b1; s1=1'b1;
#5 i0=1'b1; i1=1'b1; i2=1'b1; i3=1'b1; s0=1'b1; s1=1'b1;
end
initial
//afisare cu directiva $monitor
$monitor ($time," input=%b,%b,%b,%b,%b,%b output=%b",i0,i1,i2,i3,s0,s1,out);
endmodule
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