Cyclone IV E JTAG inputs board pull-up to VCCA instead of VCCIO?

Hi,

I've implemented the guideline to pull TMS and TDI to VCCA (as shown in 8-23 and required for 2.5, 3.0 and 3.3V I/O) which is a well working combination.

Your question on I/O levels is answered in "Configuration and JTAG Pin I/O Requirements" (p.8-5): "Cyclone IV devices are manufactured usingt the TSMC 60nm low-k dielectric process. Although Cyclone IV devices use TSMC 2.5-V transistor technology in the I/O buffers, the devices are compatible and able to interface with 2.5, 3.0 and 3.3-V configuration voltage standards..."

(For JTAG the VCCA is to be connected to the Header and is used by the USB-Blaster as I/O supply...)