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Subject: A synthesis question ( PCI based ASIC )

Date: 03/11/00 at 7:02 AM
Posted by: Yang Li
E-mail: yang_li1@yahoo.com
Message Posted:

A synthesis question

I have a design which is to be targeted to ASIC.

This design has synthesized with 66 Mhz PCI constraint. Timings are not met with a slack of approx -4 ns
I gave worst case constraints from PCI side. and best case synthesis cell selection options(timingwise)
As the code changes will take a lot time again to simulate, I have another quick option
I am sure that this design will work on 33 Mhz clock.

Now what method I am following is
1) Synthesis with 66 Mhz constraint with worst case PCI delays. Let the logic be generated with max efforts.
2) Generate timing reports for 66 Mhz , 33 Mhz . ( Ofcource 66 mhz will fail. )
3) Target it to ASIC. with a facility on board made for 33 Mhz, 66 Mhz. ( PCI66EN and Config space bit reset from board jumpers ).
4) Assume that PCI chipset will give me best timings ( If I put the card nearer to chipset ), I will give a try on 66 Mhz enable via board jumpers.

Is this method appropriate ? What I am assuming is bus will not give me worst timings.

---Yang Li

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