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anon10128
21-09-2013, 12:35 AM
Hi sir,
How to design a full adder using flip flops?

Thank you

anup
21-09-2013, 06:28 AM
Anon10128,

A flip-flop is a sequential circuit and an adder is a combinational circuit. Did the question have anything more than this?

Thanks,
Anup

anon10128
21-09-2013, 10:35 AM
No sir I am not sure. Actually it is a question asked to our seniors. They have sent a experience ppt, in that ppt this question is given.

Thank you.

basant
21-09-2013, 02:56 PM
Anon10128,

You can probably design a pipelined adder something as described in the link below. However, this will incur additional delays.

http://www.engr.uky.edu/~elias/projects/12.pdf (http://www.engr.uky.edu/~elias/projects/12.pdf)

-- Basant

anon10128
21-09-2013, 06:36 PM
Good evening,

That means there is no use of adding that D-flip flop in the circuit. Or it has some other purpose?

Thank you.

basant
21-09-2013, 09:10 PM
Anon10128,

D flip-flop in the circuit is being used to temporarily store the result and forward to the next stage after a clock cycle delay. You can also think it as a pipeline register.

-- Basant