The Arria® II GX FPGA Development Kit uses a 150mA rated regulator for the 2.5V VCCA and VCCA_PLL power rail. The Arria II GX Early Power Estimator (EPE) will show a minimum current requirement for VCCA that is higher than 150mA.
The minimum current requirement is the amount of current that could be required for VCCA during device power up. The device may try to consume up to the minimum current requirement until the Power On Reset (POR) event is complete. After POR and device configuration, user mode current requirements will apply.
Although VCCA is not monitored by the POR circuitry, VCCA_PLL is monitored by POR. There is a possibility the device can fail to complete POR and configure if the 2.5V regulator used for VCCA and VCCA_PLL fails to provide a sufficient voltage to trip the POR circuit.
If you are using the Arria II FPGA GX Development Kit as a reference for your own board design, Altera recommends using a regulator that can meet the minimum power requirements of all the device power pins that are shared by the supply.
There will be no change to the existing Arria II GX FPGA Development Kit to update the 2.5V regulator used for VCCA and VCCA_PLL.
