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Altera_Forum's avatar
Altera_Forum
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13 years ago

lpm functions with no clock

Hi I am very new to fpga so apologise if these are dumb questions but I have searched all over and cant find any help. We are trying to use some lpm functions concatenated together, a mul...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
13 years ago

Frank,

from the doc lpmmult_accum is not a y = a*b+c operation, but it actually y = y + a*b, with y being an internal register within the function. Hence my question...

BTW, a small note:

TimeQuest represents time as a 32 bit integer number in picoseconds and can't represent time above ~4 milliseconds.

When dealing with such cases (ie, a 50 Hz clock as a 20 ms period), it's necessary to lie a bit to TimeQuest.