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Altera_Forum
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20 years ago

cyclone ep1c6Q connects to 5V PCI

In my design, I want to use bank 4 of ep1c6q240 to connect 5V pci. Must i use buffers between ep1c6 and 5V pci, including AD[31:0] , CLK, control signals? If so, what kind of buffer chips should use ...
Altera_Forum's avatar
Altera_Forum
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20 years ago

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