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Altera_Forum's avatar
Altera_Forum
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9 years ago

How to calculate fractional part of quotient when using the lpm_div

The lpm_div outputs quotient and remainder. Can it be used to implement fixed point division?? The remainder is not equal to the fractional part. I am not sure how to calculate fractional part...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
9 years ago

OK, I understand how to use the shifting trick. Thanks.

It is just that I know that adder/subtractor needs only limited logic elements, and multiplier can use a DSP block. So when I saw the logic usage by the divider I was shocked!

Basically like multiplication is just shift and add, in contrast division is shift and subtract. Therefore, it does not make sense to me why it needs 100s of logic elements.