How can I interface the TDI and TDO lines of the JTAG pins of MAX series devices that have different VCCIO levels?

Description

You can interface the TDI and TDO lines of the JTAG pins of MAX® series devices that have different V_CCIO levels by inserting a level shifter between the devices.

Refer to Configuring Mixed Altera FPGA Chains (PDF) for an example of how to interface the TDI and TDO lines of the JTAG pins that have different V_CCIO levels.