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Dear Expert,
RGMII protocol version2.0 defines the requirement of RXC and TXC clock is +-50ppm as below show, and also I found the requirement of PHY crystal is +-100ppm.
My questions are:
RGMII protocol:
DP83TG720R datsheet:
Hi Jing,
The following FAQ will go through your queries:
https://e2e.ti.com/support/interface-group/interface/f/interface-forum/1099943/faq-how-to-select-the-crystal-s-ppm-specification-for-an-ethernet-system
Please let me know if this helps and if there are any further queries.
Regards,
Rahul