Subtractor /Multiplier. Section 4.5 & 4.7. Outline. Delay Four Bit Subtractor Multiplier. Four Bit Adder. Erroneous Results When Delay is inserted in half_adder.v. Four-Bit Adder. C 4 is calculated last because it takes C 0 8 gates to reach C 4 .
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Section 4.5 & 4.7
C4 is calculated last because it takes C0 8 gates to reach C4.
Each FA uses 2 XOR, 2 AND and 1 OR gate.
A four-bit adder uses 8 XOR, 8 AND and 4 OR gate.
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Overflow can be an issue in unsigned addition.
overflow in unsigned
For detecting overflow in addition/subtraction of signed numbers
If M=0, =
If M=1, =
2’s complement is generated of B is generated!
Ignore V if you are working with unsigned numbers.