Cyclone IV E Device VCCIO bank Power Supply related

Hi,

1. Is this approach correct?
   Can 3.3 V LVTTL/LVCMOS signals be safely interfaced to an FPGA I/O bank powered at 3.0 V without violating input tolerance or causing long‑term reliability issues?
   1. Yes, you are correct.
2. What about FPGA outputs?
   If the FPGA bank is powered at 3.0 V VCCIO, and the FPGA drives LVTTL/LVCMOS outputs to external circuitry that expects 3.3 V levels, will this work reliably?
   • Are the VOL/VOH levels still compliant?
     • You will need to check the ViL and ViH of the device to see if it is meeting the specs.
   • Are there any risks of reduced noise margin?
     • Please follow the guideline mention on the termination resistors.
3. In summary:
   • Is powering the bank at 3.0 V a valid method to avoid adding series termination?
     • If you are using 3.3V IO standard then it is recommended to use 3.3V VCCIO.
     • https://docs.altera.com/v/u/docs/654327/cyclone-iv-device-handbook-volume-3-device-datasheet
   • What are the recommended practices for LVTTL/LVCMOS signaling in Cyclone IV E when the external system uses 3.3 V levels?
     • I would recommend to the same IO Standard as the external systems.

Thanks.