I have a X310 with a pair of CBX-130s installed and am running RFNoC. The flowraph looks like this: Radio (running at 200MHz) -> DDC (200MHz down to 50MHz) -> splitter -> off to some other blocks. What is weird to me is that I wasn't thinking and I set the sample_rate to to be the master_clock_rate (200MHz in this case), but the CBX-120 only has a sample-rate of 120MHz. This process seems to work and my flowgraph is running as I expect it should. There are no warning or errors from UHD when I run this saying that I had an incorrect sample_rate. Now, if I leave the master_clock_rate alone, but set the sample_rate to be 120MHz, the flowgraph barfs immediately and I get timeouts non-stop. So I am guessing that there is a concept between the master_clock_rate/sample_rate, or some combination of them and the DDC that I am missing.
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