Synchronizing PXIe-6556

Hi,

I'm trying to do the following two different synchronization tasks (for proof of concept) with two PXIe-6556 cards both in a PXIe-1073 chassis:

1. Synchronize two generation sessions with one generation session on each 6556 card.  If I configure one session to have a SoftwareStartTrigger and export StartTrigger on PxiTrig0Str, the second session will successfully trigger from it.  However, they aren't aligned, which I think is due to them not having a shared reference clock?
2. Synchronize two generation sessions on a single 6556 card.  This one I haven't had any luck and I'm not sure is possible.

Thoughts?

Thanks for the help.