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Is shift adder and serial adder are same? I tried Google but I cannot understand difference. I have to use it in VHDL.

Thanks

user3696958
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  • A shift adder is used to implement multiplication by shifting a multiplicand. A serial adder is also known as a bit-serial adder or binary serial adder. –  May 09 '15 at 22:37

1 Answers1

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Serial binary adder: The serial binary adder or bit-serial adder is a digital circuit that performs binary addition bit by bit. For example to add 1010 + 0100, we will start from LSB.

0 + 0 --> 0 
1 + 0 --> 1 
0 + 1 --> 1 
1 + 0 --> 1

And your final answer is 1110.

Shift Adder: Is used for multiplication. For example if we want to multiply 10 and 10, we will start from LSB.

10 * 0 --> 00
10 * 1 --> 10

First partial product is shifted to right before added to second partial product. For getting the result.

 000
+10
-------
 100
tollin jose
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