AR# 61946

描述

UG578 v1.0 states on page 19 that for line rates above 16.375 Gbps a reference clock input local to the quad must be used.

This needs to be more restrictive.

解决方案

For line rates > 16.375 Gbps:

• QPLL0 can only be driven from GTREFCLK0
• QPPL1 can only be driven from GTREFCLK1

This is added to v1.2 of the user guide.

The UltraScale Transceiver Wizard already follows this restriction.