7.3.1. Power Up
Power up all the power supplies that are monitored by the POR circuitry. All power supplies, including VCCPGM and VCCPD , must ramp up from 0 V to the recommended operating voltage level within the ramp-up time specification. Otherwise, hold the nCONFIG pin low until all the power supplies reach the recommended voltage level.
The configuration input buffers do not have to share power lines with the regular I/O buffers in Cyclone® V devices.
The operating voltage for the configuration input pin is independent of the I/O banks power supply, VCCIO , during configuration. Therefore, Cyclone® V devices do not require configuration voltage constraints on VCCIO .
Use the VCCPD pin, a dedicated programming power supply, to power the I/O pre-drivers and JTAG I/O pins (TCK, TMS, TDI, and TDO). The supported configuration voltages are 2.5, 3.0, and 3.3 V.
If VCCIO of the bank is set to 2.5 V or lower, VCCPD must be powered up at 2.5 V. If VCCIO is set greater than 2.5 V, VCCPD must be greater than VCCIO . For example, when VCCIO is set to 3.0 V, VCCPD must be set at 3.0 V or above. When VCCIO is set to 3.3 V, VCCPD must be set at 3.3 V.
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