In Stratix III and Stratix IV devices, 2.5V is supplied to VCCIO1A of BANK1A with JTAG signal. At this time, I would like to use the JTAG pin as a 3.3V interface. Is that possible?

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In Stratix III and Stratix IV devices, supply 2.5V to VCCIO1A of BANK1A with JTAG signals. At this time, I would like to use the JTAG pins as a 3.3V interface.Is this possible?

No, direct connection is not possible.

If VCCIO1A is 2.5V, VCCPD1A should be the same 2.5V.

The JTAG signals are referenced to the voltage on VCCPD1A.
Therefore, if you want to make it 3.3V, you need to take measures such as placing a level conversion IC outside the device.

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