As with the transceiver location, the
reference clock can be selected in UltraScale-based devices. Options are
refclk0 and refclk1 along
with the refclk0 and refclk1
inputs from the two quads below and above the selected transceiver location. See the
UltraScale
Architecture GTH Transceivers User Guide (UG576) and the
UltraScale Architecture GTY Transceivers User Guide
(UG578) for
more information on reference clock distribution.