HDMI compliance issue

Hi Dlim,

We won't be able to do a simple design to isolate the problem since the CDR always shows that it is locked to data. It is only at the later TMDS decoder stage that we do find something wrong which causes the HDMI Rx to lose sync from time to time for the specific HDMI source that exhibits larger jitters.

As we employ dynamic re-configuration for the transceivers, it is required that we do re-calibration whenever we reconfigure the Rx when the Tx. So the potentially incorrect CDR calibration at power-up should not be the cause.

And I see no transceiver-related errors during compilation.

Currently we have scanned the xcvrs settings (VGA gain, CTLE DC/AC gains, DEF off/adaptive) and decided that the current settings are proper. We also tried medium and low bandwidth settings for the fPLL(High bandwidth is invalid). But all to no avail.

We are doing more experiments to determine what is so special about this HDMI source ...

Thanks,

Jay