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Strange synthesis behavior from Quartus II 2.2

Hi,

I have a design that was compiled in Quartus II 2.0 (SP2) and used

22,000 logic elements on the APEX20K1500E device. I compiled the same design in Quartus II 2.2 (SP2) and it takes 42,000 logic elements !! Has anyone seen such strange behavior with Quartus II 2.2 ? If so, how is this bug fixed ?

Thanks, Prashant

PS : Also, in the summary report, Quartus II 2.0 shows 85/493 pins used, while Quartus II 2.2 shows 85/488 pins, for the same device.

Reply to
Prashant
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Are you absolutely sure you implemented the exact same code?

=-a

Reply to
Andy Peters

I'd report it directy to Altera... Becouse it's noncenses. P.S. Quartus II 3.0 version is available. Maybe this one will be better...

/Vakaras/

Reply to
Vakaras

Yes, I am. Just copied the files from one directory to another. I can't send the code to Altera because its proprietary. Wanted to check if anyone else has seen a similar problem and has managed to solve it.

Thanks, Prashant

Reply to
Prashant

Hi Prashant,

Even without seeing your code, it is possible for us to give you some hint of what's happened. You could, for example, include the report file from the two runs. I'd suggest opening up an issue with mysupport.altera.com and an AE will be happy to help you out.

Don't let all the two's in Quartus II 2.2 fool you -- our goal is *not* to double the number of LEs in your design :-)

Regards,

Paul Leventis Altera Corp.

Reply to
Paul Leventis

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