Cyclone IV E Device VCCIO bank Power Supply related

Hi Team,

We are using a Cyclone IV E (EP4CE30) device in our current design. In one of Altera’s application documents (AN 447), it is mentioned that:

• When LVTTL/LVCMOS signals are connected to an FPGA bank powered at 3.3 V VCCIO, series termination should be applied on the nets.
• It is also stated that if we want to connect these LVTTL/LVCMOS nets without any series termination, we can power the FPGA bank with 3.0 V VCCIO instead.
• please refer the below AN447 application note snippet 

  (https://www.intel.com/programmable/technical-pdfs/683295.pdf)

  

My questions are:

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?
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?
   • Are there any risks of reduced noise margin?
3. In summary:
   • Is powering the bank at 3.0 V a valid method to avoid adding series termination?
   • What are the recommended practices for LVTTL/LVCMOS signaling in Cyclone IV E when the external system uses 3.3 V levels?

Any clarification from Intel or others with experience using Cyclone IV E in such configurations would be greatly appreciated.