Forum Discussion
Occasional ContributorArria 10 GX RX max intra-differential pair skew
Hi,
I presume that tolerated maximal intra pair skew is larger than guessed numbers. I see specification of up to 0.4 Tbit skew in HDMI 1.4 spec, expect that Arria 10 transceiver has no problem to decode the signal.
As far as I understand, Altera doesn't specify RX max intra pair skew. I also don't think that intra pair skew is a primary parameter in receiver performance analysis. It translates into differential mode pulse distortion and unwanted common mode signal. Related to specified receiver parameters, minimal eye opening is the nearest relevant parameter.
To determine HDMI compliance, I would either model expected input waveform with maximal skew and check eye opening. Or test receiver performance in real hardware.
Regards Frank
Occasional ContributorHi,
This is not about layout.
The Arria 10 RX transceiver is used to implement an HDMI receiver. HDMI PHY compliance test will apply a signal to the Arria 10 RX with a certain intra-pair skew and the RX must be able to receive this signal.
If it isn't, it means you cannot build an HDMI RX using an Arria 10. This is why I am asking here, what is the max intra-pair skew the Arria 10 RX can take?
Regards
Regular ContributorHi,
As I mentioned before, Altera does not publish this data. The Rx uses the adaptation to capture a reliable data, but it does rely on the minimum skew between P and N pins. Recommend to keep value under < 5ps as a general practice.
Regards
