PCI 3.3V IO

[Altera_Forum]

I was wondering if anyone has connected an FPGA and a PCI/Mini-pci Card with the IO standard set as 3.3V LVTTL instead of 3.3 PCI? PCI is still a 3.3V standard, but I'm not sure if the drivers are physically different in hte FPGA? 

 Thanks ,J

[Altera_Forum]

--- Quote Start ---  originally posted by jdhar@Jun 12 2006, 08:46 AM i was wondering if anyone has connected an fpga and a pci/mini-pci card with the io standard set as 3.3v lvttl instead of 3.3 pci? pci is still a 3.3v standard, but i&#39;m not sure if the drivers are physically different in hte fpga?  thanks ,j <div align='right'><{post_snapback}> (index.php?act=findpost&pid=16098)  --- quote end ---    --- Quote End ---   I did use 3.3 LVTTL for onboard PCI. Thought the drive chart is different. There is no problem at 33MHz.

[Altera_Forum]

on-board meaning you didn&#39;t use an expansion card.. the interface was contained on the board? How far away was the device?

[Altera_Forum]

--- Quote Start ---  originally posted by jdhar@Jun 13 2006, 01:38 AM on-board meaning you didn&#39;t use an expansion card.. the interface was contained on the board? how far away was the device? <div align='right'><{post_snapback}> (index.php?act=findpost&pid=16133)  --- quote end ---    --- Quote End ---   About 2-4 inches from the fpga. I think a single mini-pci socket should be OK. But if you want to drive several PCI slots, you would better use PCI capable pins.

[Altera_Forum]

did you use external components within the pci lines - as resistors to limit current or external clamping-diodes?

[Altera_Forum]

--- Quote Start ---  originally posted by stonie@Jun 13 2006, 04:54 PM did you use external components within the pci lines - as resistors to limit current or external clamping-diodes? <div align='right'><{post_snapback}> (index.php?act=findpost&pid=16149)  --- quote end ---    --- Quote End ---   I use minimum current strength for most pins, including onboard ddr sdram and others. I didn&#39;t use series resisters or clamping diodes.

[Altera_Forum]

series resistors on a PCI bus would suck if you were 1 inch out http://forum.niosforum.com/work2/style_emoticons/<#EMO_DIR#>/smile.gif