cyclone ep1c6Q connects to 5V PCI

eRen,

inserting buffers is not recommended.

... see altera application note an330.pdf (http://www.altera.com/literature/an/an330.pdf)

But in actual hardware no PCI master drives the bus with 5V. Since years there is a migration to 3.3V in progress. Normally 'PCI universal cards' (with two keying slots) accept 5V but drive 3.3V, because PCI 3.0 removes support for 5V-only cards.

... see pci faq (http://www.pcisig.com/news_room/faqs/faq_pci30/pci30_faq.pdf)

Mike

Altera used the QS3861 (as per Camelot).

Refer to this link for the datasheet for the Stratix PCI board. (The schematic is embedded in this PDF doc)

stratix pci development board datasheet (http://www.altera.com/literature/ds/ds_stratix_pci_bd.pdf)

Hi,

Thanks very much. I will try.

eRen

Hi,

I have read the files, but still have questions.

My pci add in card will be connected to PC motherboard. The PCI connector on common PC motherboard does not have the 3.3V PCI keys, so I think using buffers is better.

If having used buffers, which bank of EP1C6Q244 shall I use, bank1,3(with 3.3V PCI support) or bank 2, 4(without 3.3V PCI surpport, just 3.3V TTL)?

The PCI CLK length is 2.5inches. If using buffer chips, it means that the wire between PCI CLK pin and buffer chip is 2.5inches, or from PCIpin to EP1c6Q pin is 2.5inches?

Thanks,

eRen