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How can I implement a subtractor with these given logic gates

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Kladen Stein

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Kladen Stein

Joined Jan 10, 2018
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Hi, in my project I have to design a subtractor. In this design i can only use these ones : AND Gate, XOR Gate, an Adder and a Circular Left Shifter.
Like in the image below.

Subtractor(A - B) means A + ~B + 1. I have adder but don't have not gate("~" means opposite) and I didn't get it with these givens.

How can i design this with these givens (I don't have to use all of them) ?
Thank you.

alu.PNG
 
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WBahn

WBahn

Joined Mar 31, 2012
30,075
Kladen Stein said:
Hi, in my project I have to design a subtractor. In this design i can only use these ones : AND Gate, XOR Gate, an Adder and a Circular Left Shifter.
Like in the image below.

Subtractor(A - B) means A + ~B + 1. I have adder but don't have not gate("~" means opposite) and I didn't get it with these givens.

How can i design this with these givens (I don't have to use all of them) ?
Thank you.
Click to expand...
What is A XORed with a 1?
 
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