Can the UltraScale DisplayPort Sink support sources using Spread Spectrum Clocking (SSC) when receiving at 1.62 Gbps?
Starting with the DisplayPort v6.1 Sink, it is required to use the DP159 retimer so that sources with Spread Spectrum Clocking (SSC) can be supported.
Without DP159, the DisplayPort Sink will see inconsistent results when receiving video from GPUs at all line rates that have low-frequency jitter that cannot be tracked by the GTs.
Because of the internal CPLL limitation in UltraScale devices, the documentation shows that for 1.62Gbps, using the forwarded clock by the DP159 is not supported.
Instead, an external fixed clock of 162MHz is required.
For an UltraScale device in 1.62 Gbps mode:
Please see the DisplayPort product guide PG064 for more details.