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Altera_Forum
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16 years ago

72-bit version of LPM_DIVIDE

Dear All, i need to implement division where numerator is 72bits, denominator 16bits. Of course it does not synthesize as numerator limit is 64bits. Any ideas how to solve such situation? tha...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
16 years ago

try using the numeric_std package to do this: 


signal a : unsigned(71 downto 0);
signal b : unsigned(71 downto 0);
signal c : unsigned(15 downto 0);
..
a <= b/c;

Have lots of redundant pipeline stage registers before the divide and turn register retiming on.

From a discussion in another thread, it appears it will work, but not be as efficient as the megafunction.