UltraScale Architecture SelectIO Resources User Guide (UG571)

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1.15 English

The V CCO supply is the primary power supply of the I/O circuitry. The V CCO (V) columns in Table: VCCO and VREF Requirements for Each Supported I/O Standard provide the V CCO requirements for each of the supported I/O standards, and illustrate the V CCO requirements for inputs and outputs as well as the optional internal differential termination circuit.

All V CCO pins for a given HP I/O bank must be connected to the same external voltage supply on the board, and as a result, all of the I/O within a given I/O bank must share the same V CCO level. The V CCO voltage must match the requirements for the I/O standards that have been assigned to the I/O bank.

CAUTION! Incorrect V CCO voltages can result in loss of functionality or damage the device.

In HR I/O banks, if the I/O standard voltage requirement is 1.8V, but a V CCO voltage of 2.5V is applied, the device automatically enters an over-voltage protection mode. Reconfiguring the device with the correct V CCO voltage level restores normal operation.