Strange synthesis behavior from Quartus II 2.2

[Prashant]

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.

 

[Andy Peters]

prashantj@usa.net (Prashant) wrote in message news:<ea62e09.0309251307.6cadf3a1@posting.google.com>...

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.

Are you absolutely sure you implemented the exact same code?

=-a

 

[Vakaras]

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/

 

[Prashant]

Are you absolutely sure you implemented the exact same code?

=-a

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

 

[Paul Leventis]

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.


"Prashant" <prashantj@usa.net> wrote in message
news:ea62e09.0309270932.418551e@posting.google.com...

Are you absolutely sure you implemented the exact same code?

=-a


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