Synchroniz​ing x-series pxie 6358 and 6363

Hi,
I have 2 pieces of PXIe-6358 at the moment and planning to extend the kit by 3 pieces of PXIe-6363 and to perform HW-timed analog readings on all devices synchronously.
Using all AI channels of the PXIe-6363s, the max. sampling freq. is going to be 31.25 kHz I guess. Thus the sampling freq. of the PXIe-6358s have to be set to 31.25 kHz as well. To enforce the synchronisation with low jitter I think all sample clocks should be tied to a reference clock - OnBoardClock for example. The question is: how can I synchronise these X-series cards to a same reference clock and to the same frequency? Can somebody please suggest how it is done efficiently.
Thanks,
Krivan

Synchronizing DSA, S Series, and X Series Devices With a Single NI-DAQmx Task
NI-STC3 Timing and Synchronization Technology
Synchronization Explained
Christian

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