Digital Electronics - Combinational Logic Circuits - Discussion
Discussion Forum : Combinational Logic Circuits - General Questions (Q.No. 36)
36.
The carry propagation can be expressed as ________.
Cp = AB
Cp = A + B
Discussion:
10 comments Page 1 of 1.
Phalguni said:
2 years ago
Carry Propagation is expressed as A xor B.
Carry generate is expressed as AB.
Carry generate is expressed as AB.
(1)
Sai Krishna said:
6 years ago
A B Cin Cout
0 0 0 0
0 0 1 0
0 1 0 0
0 1 1 1
1 0 0 0
1 0 1 1
1 1 0 1
1 1 1 1
Carry propagation means the carry input (C in)bit should be '1' and it should be propagated to C out. If you observe the truth table (for C in=1), C out=A+B.
0 0 0 0
0 0 1 0
0 1 0 0
0 1 1 1
1 0 0 0
1 0 1 1
1 1 0 1
1 1 1 1
Carry propagation means the carry input (C in)bit should be '1' and it should be propagated to C out. If you observe the truth table (for C in=1), C out=A+B.
(1)
Sunil said:
6 years ago
A XOR B is correct. I too agree.
Reshma said:
7 years ago
A XOR B is correct.
Sai krishna said:
7 years ago
It must be A XOR B.
Brjesh kumar said:
8 years ago
It must be A.B.
Ayan said:
8 years ago
It must be A.B.
Manju said:
8 years ago
The Expression for carry AB, for sum A XOR B.
Naren said:
9 years ago
Carry propagate is Cp= A XOR B.
The number of gate levels for the carry propagation can be found from the circuit of full adder.
For reference see M. Morris Mano digital design page no. 159 (V th edition).
The number of gate levels for the carry propagation can be found from the circuit of full adder.
For reference see M. Morris Mano digital design page no. 159 (V th edition).
Sudeep Kumar Rana said:
1 decade ago
This happens in parallel adders. (Where we try to add numbers in parallel via more than one adders).
A carry propagation occurs when carry from one adder needs to be forwarded to other adder and that second adder is holding the computation (addition) because carry from first adder has not come yet. So there is a slight delay for second adder and this is known as carry propagation.
A carry propagation occurs when carry from one adder needs to be forwarded to other adder and that second adder is holding the computation (addition) because carry from first adder has not come yet. So there is a slight delay for second adder and this is known as carry propagation.
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