PCI bus interface question about signaling voltage

[guybrush]

qs3861 pci

Hi all!
I'm starting a new design which deal with a cPCI inteface. I know that the computer board as a 5V signaling. This mean that all the board into the bus must have a 5V signaling or at least be 5V tolerant? An FPGA that can't tolerate the 5V will blow up?

Thank you

 

[Big Boy]

sn74cbtd16211 pci

You can use MOS switches to trim the levels to 3.3V so that the FPGA will see 0V to 3.3V. In the other direction, the signals going to the FPGA will send 3.3V to the PCI bus. Although the PCI bus is 5V, most systems will work with 0V/3.3V signalling.

There are specialised MOS switches array, with very low impedance.

 

[it_boy]

Re: PCI bus interface

Most of the FPGAs are not 5V tolerant. Depends on which FPGA device you are planning to use.
Have a look at this... might help you
https://www.xilinx.com/bvdocs/appnotes/xapp653.pdf

 

[Ace-X]

PCI bus interface

Also, you can try fast bidirectional logic level converters, like MAX300x serie from Maxim. They are very cheap (<2$ for 8-wires converter).

 

[gooodman]

Re: PCI bus interface

Hi,
Use a switch or level converter isn't a smart way to solve this problem.
You can choose a FPGA which supports PCI interface.
PLS check the spec. of FPGAs. (see the attached file).
BTW, PCI is 3.3V

 

[waterloo]

Re: PCI bus interface

In avnet spartan3 PCI board, they use SN74CBTD16211 to solve this problem.

 

[ipcore]

PCI bus interface

pls reference IDT QS3861