I am attempting to use JMODE 16 with Fs=1000MHz. I have confirmed that KM1 and Octets per frame match the other side of the link.
After initialization, I read JESD_STATUS and ALM_STATUS and get these values:
JESD_STATUS (0x208) -> -0x1c (REALIGNED, ALIGNED, PLL_LOCKED)
ALM_STATUS (0x2C1) -> 0x8 (Link Alarm).
There have been times when I have read 0x7c out of JESD_STATUS, but then soon after I read 0x1c.
Sometimes when I clear the REALIGNED bit of JESD_STATUS, it doesn't come back for a while.
The largest spurs in my clock source are about 50 dB down a few kHz away from the main lobe. I have not ever observed Clock Alarm in the ADC.
Any thoughts on what would cause the link to behave this way?
Thanks,
Cam