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When two 8-bit numbers  complement representation (with A0 and B0 as the least significant bits) are added using a ripple-carry adder, the sum bits obtained are  and the carry bits are . An overflow is said to have occurred if
  • a)
    the carry bit C7 is 1.
  • b)
    all the carry bits
  • c)
  • d)
Correct answer is option 'C'. Can you explain this answer?
Verified Answer
When two 8-bit numbers complement representation (with A0 and B0as the...
Overflow is said to occur in the following cases

The 3rd condition occurs in the following case A7B7S7', now the question arises how ? 

NOW, A7=1 AND B7=1 S7=0 is only possible when C6=0 otherwise s7 would become 1 C7 has to be 1 (1+1+0 generates carry)
ON similar basis we can prove that C7=0 and C6=1 is produced by A7'B7'S7. Hence either of the two conditions cause overflow . Hence ans is C .
Why not A ? when C7=1 and C6 =1 this doesnt indicate overflow (4th row in the table)
Why not B ? if all carry bits are 1 then C7=1 and C6=1 (This also generates 4th row)
Why not D ? These combinations are C0 and C1 , the lower carrys dont indicate overflow
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When two 8-bit numbers complement representation (with A0 and B0as the least significant bits) are added using a ripple-carry adder, the sum bits obtained are and the carry bits are . An overflow is said to have occurred ifa)the carry bit C7 is 1.b)all the carry bitsc)d)Correct answer is option 'C'. Can you explain this answer?
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When two 8-bit numbers complement representation (with A0 and B0as the least significant bits) are added using a ripple-carry adder, the sum bits obtained are and the carry bits are . An overflow is said to have occurred ifa)the carry bit C7 is 1.b)all the carry bitsc)d)Correct answer is option 'C'. Can you explain this answer? for Computer Science Engineering (CSE) 2024 is part of Computer Science Engineering (CSE) preparation. The Question and answers have been prepared according to the Computer Science Engineering (CSE) exam syllabus. Information about When two 8-bit numbers complement representation (with A0 and B0as the least significant bits) are added using a ripple-carry adder, the sum bits obtained are and the carry bits are . An overflow is said to have occurred ifa)the carry bit C7 is 1.b)all the carry bitsc)d)Correct answer is option 'C'. Can you explain this answer? covers all topics & solutions for Computer Science Engineering (CSE) 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for When two 8-bit numbers complement representation (with A0 and B0as the least significant bits) are added using a ripple-carry adder, the sum bits obtained are and the carry bits are . An overflow is said to have occurred ifa)the carry bit C7 is 1.b)all the carry bitsc)d)Correct answer is option 'C'. Can you explain this answer?.
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