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3.7.4.1. CDR Clock Output Pin for Multi and Single Transceiver Banks per Side Device
If you are planning to migrate from bigger device variant to a smaller device variant that only supports a single GTS transceiver bank on either the left or right side of the device, then you need to bond out the CDR clock output (CDRCLKOUT_GTS) pin on the bigger density device instead to allow migration to smaller device variant.
If you do not plan to migrate to a smaller device family with a single transceiver bank on either the left or right side, you can optionally route the CDR clock output pin to the local reference clock pin in the same bank.