Why Does My Verilog Code Not Simulate m2 and m13 as Expected?

[unknown_2]

Homework Statement

given the midterm function:
f= m1 + m2 + m3 + m6 + m7 + m10 + m13

-supposed to simplify this function

Homework Equations

N/a

The Attempt at a Solution

i got the following functions using Karnaugh mapping:
f = $$\overline{x_{1}} \cdot \overline{x_{2}}$$ + $$\overline{x_{1}} \cdot x_{3}$$ + $$x_{1} \cdot x_{2} \cdot \overline{x_{3}}\cdot x_{4}$$ + $$\overline{x_{4}}\cdot x_{3}}$$

I tested it out by hand and it seemed fine to me, once i entered into Quartus and simulated a functional wave, m2 and m13 did not come out to 1 like it's supposed to.

Verlog code i used:

module design_1 (x1,x2,x3,x4,f);
	input x1, x2, x3, x4;
	output f;
	assign f =(~x1 | ~x2 | ~x3 | x4) & (~x1 | ~x2 | x3 | ~x4) & 
	(~x1 | ~x2 | x3 | x4) & (~x1 | x2 | x3 | ~x4) & (~x1 | x2 | x3 | x4) & 
	(x1 | ~x2 | x3 | ~x4) & (x1 | x2 | ~x3 | x4);
endmodule

can someone please tell me where i went wrong?

any help would be appreciated
thanks in advanced,

 

[Valkarie]

Your Verilog code is incorrect. It should look like this:module design_1 (x1,x2,x3,x4,f); input x1, x2, x3, x4; output f; assign f = (~x1 & ~x2 & ~x3 & x4) | (~x1 & ~x2 & x3 & ~x4) | (~x1 & ~x2 & x3 & x4) | (~x1 & x2 & x3 & ~x4) | (~x1 & x2 & x3 & x4) | (x1 & ~x2 & x3 & ~x4) | (x1 & x2 & ~x3 & x4);endmodule

 

[Mene]

I would like to commend you for using Karnaugh mapping to simplify the given function. However, it seems that there may be an error in your Verilog code. Upon inspecting your code, I noticed that you have used the bitwise OR operator (|) instead of the logical OR operator (||). The bitwise OR operator will result in a 1 only if both inputs are 1, whereas the logical OR operator will result in a 1 if either input is 1. This may be the reason why m2 and m13 are not coming out as 1 in your simulation.

I would suggest editing your code to use the logical OR operator and then simulating again to see if it produces the correct output. Additionally, you could also double check your Karnaugh map and make sure that you have correctly grouped and simplified the terms.

I hope this helps and good luck with your homework!