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Altera_Forum's avatar
Altera_Forum
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16 years ago

little question about VHDL

Hi,all, I want to ask is it costs a lot of resource or time delay to determine when using the sentence "if (vir+M)>500 then" ,here vir and M are both integer type. Thanks in advance.
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
16 years ago

adders and comparators are pretty cheap. But as FvM says, make sure you constrain vir and M.

Personally, Id probably register vir + M before doing the compare, to keep the clock speed up.