PCI bus signals seem to be switching on the wrong edge of the clock... why?

[davec]

The signals on my PCI bus seem to be switching on the rising edge,
which doesn't make sense, since that is when the signals are being
sampled. Why would this be happening? I checked the silly stuff, like

making sure my scope wasn't inverting, etc...

I have a TI Firewire OHCI chip (TSB43AB22A) tied to a Blackfin 21535.
My system locks up occasionally when writing data out through Firewire,

and I'm wondering if this isn't part of the problem. I feed the clock
into both chips, but can't understand why the chips would switch their
signals near the rising edge. Any thoughts?


Thanks.
Dave

 

[Zihan]

What components replaces the ballast?
Safi.

 

[davec]

I'm not sure what you mean by "ballast"...