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HDMI/DVI Intra-pair and Inter-pair skew

Hello,

Need clarification on intra-pair and inter-pair skew for TMDS signals (HDMI or DVI) at source connector. Per HDMI spec, @ 225MHz, intra-pair skew is 66ps and inter-pair skew spec is 888ps at source connector. I also found that @165Mhz, intra-pair skew spec is < 90ps and inter-pair skew spec.

What is the max intra-pair and inter-pair skew allowed for TMDS differential traces from TI devices like AM3894, TFP410, DS16EV5110A etc ? The max frequency is 165MHz. Considering about 130-150ps propagation delay for every 1 inch and using the above number, intra-pair skew can be < 600mils and inter-pair skew can be < 8". Even if we consider the soure IC skew, ESD parasitics skew and connector skew, there is still a lot of margin. What is TI's recommendation ? In general I have seen 1" inter-pair skew spec and 5mils intra-pair skew spec which is much lower than what the spec mentions. Am I missing anything ? Please clarify.

Thanks,

Lakshmi

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