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Altera_Forum's avatar
Altera_Forum
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8 years ago

lpm functions and hdl

Hi all, So I'm trying to create a (synchronous) 8-bit loadable counter, as below but for some reason this synthesizes to around 28 LE's compared to the altera LPM 11 LE version. Any idea why? ...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
8 years ago

It's actually for a Cylcone II, so it's(IIRC) a 4-input LUT. Even with all (synchronous) functions enabled and an asynchronous reset, it comes down to 11 LE's and is listed in as 8LE's + 8 LUT's. I *kinda* need the q_next in order to get the answer before the next clock but if that makes a huge difference than that's 1 extra clock per instruction, which would kinda suck.. I'll give it a whirl though...

-Mux