The bank (VCCO) voltages for all banks in SP605 are fixed and do not support 1.8V.The XC6SLX45T device on the SP605 has 4 banks, and the VCCO voltage for each of these banks is as follows:Bank 0 2.5V (VCCO0)
Other voltages on the SP605 include:VCCINT 1.2V
There is a linear regulator on the SP605 (U44), which provides a 1.8V voltage to the Linear Flash Memory on the board. This cannot be used as a bank voltage.
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