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The FIFO Lite isolates the DAC from the source, since they work in separate time domains.
So we suggest the first approach, DRIXO oscillators feed the FIFO Lite only.
Finally, it’s a little complex to explain why the FIFO Lite does not accept external control of the clock selection. I should explain all the hardware and software architecture.
What I can say is that without the auto-selection of the master clock the FIFO Lite cannot work, unless we redesign all this architecture.