Different Phase between some PXIe-7962R

[akry]

We have a DDS generator in some PXIe-7962R boards with a FlexRIO NI-5782 adapter module. FPGA programs in all boards are the same. Tell me how to run the board with a constant phase between them? Synchronization is enabled and working, but each restart causes a different phase between the boards.

[Air_Frantz]

If I understand correctly, the output of the different 5782 modules is correctly synchronized such that when you are generating you see a constant phase difference between the boards as you run, but each time you run the phase relationship between the boards is different?

If this is the case, you've achieved the clock synchronization but are not starting the generations at the same time.  I believe you will need to develop some way to trigger all of the boards to start generating at the same time.  Many times this is done by using a timing module and distributing the trigger to all boards using the DSTAR lines on the PXI backplane.

Jon