If A=1, B=1 and Ci=0, what are the outputs of this circuit, given as CARRY, SUM?
- 0, 1
- 1, 1
- 1, 0
Explanation from PART66Online
Work through the gates. A xor B = 1 xor 1 = 0, so SUM = 0 xor Ci = 0 xor 0 = 0. CARRY = A.B + Ci.(A xor B) = 1 + (0 x 0) = 1. So CARRY = 1 and SUM = 0: 1 + 1 + 0 = 2, which is binary 10. The '0, 1' option gives the same two outputs in the opposite order.
M
Matas24 asked · 23 Apr 2018
why?
Community Comments (1)
C
cptjacob
15 Aug 2018
Look up to XOR truth table
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