Forum Discussion

Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
13 years ago

QII 12.1 synthesizer problem!!!

I don't know what just happened, but when I compile my previous project (with QII 11.1) with QII 12.1 the I get the fitter error!

It seems all my projects use more LUTs by 12.1, in example my latest project in 11.1 was abou 13KLUT but with 12.1 synthesizer estimates 47KLUTs.:confused:

Can anyone explain this to me? what just happened? same vhdl code with different LUTs size!!!!!!

1 Reply

  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor
    13 years ago

    Look at the individual component resource usage. Compare each vs your compile with QII 11.1. (Compile your design into a much larger part for QII 12.1 if you need to.

    I'll bet that one of your components had a RAM/ROM block that may have synthesized into LUTs instead of a memory block. You could also check the warnings for your compile. It may give you hints as to what has happened.