The troubleshooting continues on our AD9675 design. We are unable to train/sync the JESD204B link. When we physically probe the SERDOUT± pins, we find they are static at 900 mV (common-mode voltage). We've checked that CLK± is running at 100 MHz and verified that PDWN and STBY are both low. We can read in and out of the SPI memory. One thing we've noticed is that SYNCINB± has a -300 mV differential (should be OK), but they are 1.0 V and 1.3 V (+/- respectively) thus not centered on the common-mode voltage of 0.9 V. Could this be an issue? And is there a troubleshooting checklist I can look at for this sort of problem?