COMPUTER SCIENCE AND ENGINEERING
COMPUTER ORGANIZATION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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The same as if the carry-in is tied LOW since the least significant carry-in is ignored
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That carry-out will always be HIGH
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A one will be added to the final result
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The carry-out is ignored
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Detailed explanation-1: -Explanation: For a 4-bit parallel adder, if the carry-in is connected to a logical HIGH, one will be added to the final result as a result because carry-in gives output as 1.
Detailed explanation-2: -Answer. Answer: The glib answer is “whatever the designer wants it to”.
Detailed explanation-3: -It consists of full adders connected in a chain, with the output carry from each full-adder connected to the input carry of the next full-adder in the chain. The interconnection of four full-adder (FA) circuits to provide a 4-bit parallel adder.
Detailed explanation-4: -4-bit adder performs the function of 4-bit addition that gives a sum and two bits of carry as output. Its block diagram is given in Figure 3. Here, A, B, C, D are four inputs; C 0 and C 1 are LSB and MSB of carry outputs respectively and Sum is the sum of four inputs.
Detailed explanation-5: -41. How many 4 – bit parallel binary adders will be required to construct a 4 – bit parallel multiplier? Explanation: Four 4 – bit parallel binary adders along with 16 number of 2 – input AND gates will be required to construct a 4 – bit parallel multiplier.