I'm not sure exactly what you're looking for ... but PCI and PCI-X are intended to be essentially compatible with one another. As long as the PCI 5V/3.3V signaling voltages are consistent between card and slot, one should be able to plug any PCI card into any PCI-X slot, or vice-versa. Of course you don't get the speed of PCI-X when you do that. A PCI card in a PCI-X slot forces the bus to run in PCI mode.
3.3V/5V and 32-bit/64-bit issues aside, the connectors themselves are identical. There have always been two flavors of PCI: 5V signaling, and 3.3V signaling. They use incompatible connectors (on the motherboard), and you can't plug a 5V card into a 3.3V slot or vice-versa. But you can plug a Universal card into either a 5V or 3.3V slot. PCI-X is 3.3V only, so a 5V-only PCI card will not fit into a PCI-X slot. Likewise, a 3.3V-only PCI-X card could not fit into a 5V PCI slot. However, some PCI-X cards are Universal, and could plug into a 5V PCI slot. Those are the only obvious restrictions. Any other combination should be OK. But there can always be combinations that don't work, often because of software bugs or subtle implementation incompatibilities. The most obvious difference between PCI and PCI-X, is that PCI is limited to 33MHz (or perhaps 66MHz, but not many PCI cards or motherboards do that), whereas PCI-X version 1.x can run at 133MHz. PCI-X version 2.x can go as fast as 533MHz, with plans to double that, but it also differs more substantially from PCI. PCI-X (vers. 1.x) also has some protocol differences from PCI, but by and large it "looks" about the same. Regards, Andy > Thanks in advance. I would like to know the details about the PCI and > PCI-X > slots in PC and the differences between them. I would like to know > this > information as I am having the PC add-on card which fits into the PCI > slot > (33MHZ 32 bit) and I have to design the similar card (33MHZ 32 bit) > which > will fit into the PCI slot as well as PCI-X slot(Universal card). > Please let > me know if anybody has information on this subject. > > > -- Author: Ingraham, Andrew INET: [EMAIL PROTECTED] Fat City Network Services -- 858-538-5051 http://www.fatcity.com San Diego, California -- Mailing list and web hosting services --------------------------------------------------------------------- To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB CHIPDIR-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).
