Hi all,
I'm working with an N320 and UHD 4.1, and I plan to use an external reference
clock (a 10MHz OCXO for reasons of RF phase stability) and the radio's internal
GPSDO for timing (to synchronize capture start times across radios). I found
that "clock_source=external,time_source=gpsdo" is not a supported sync_source
combination. Taking a quick glance at the N320 schematics, I'm speculating that
GPS-synced timing is also dependent on FPGA-REFCLK being slaved to the GPSDO,
and not just the PPS, is that right? Is there any viable way to accomplish the
setup I described?
It's also not ideal how the set_clock_source/set_time_source API calls behave
in the case. I had originally been calling set_clock_source("external")
followed by set_time_source("gpsdo"), which both succeed. It took a lot of
digging to figure out that the second call is silently coercing the ref clock
to be gpsdo, without any indication even a debug print statement (in the MPM
periph_manager code).
Thanks & Cheers,
--
David Raeman
Synoptic Engineering
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