AR# 73315

HDMI Receiver Subsystem IP - 7 Series designs - Why do I have issues locking to a signal from an old DirectTV (H24) source sending NTSC/PAL resolutions?

Description

There have been several cases observed where older DirectTV sources (H24) are not able to function correctly with 7 Series HDMI designs.

This is only seen in very old versions of the DirectTV source and with 7 Series devices. This is not seen with newer FPGAs.

Solution

This is a known issue and no solution is currently available.

We believe that this is due to CPLL/QPLL limitations in 7 Series coupled with a very noisy TMDS clock from the DirectTV source.

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AR# 73315
Date 02/13/2020
Status Active
Type General Article
IP