Bank 66 is a partially bonded bank in the SBVA484 package for XCZU2EG and XCZU3EG Zynq UltraScale+ MPSoC devices.
There are no VCCO pins dedicated for this Bank. How are the I/O pins in this Bank powered?
For the XCZU2EG and XCZU3EG devices in the SBVA484 package, Bank 66 is powered off the Bank 65 VCCO rail, i.e. VCCO_66 is tied to VCCO_65 inside the package.