MAX® 10 FPGA Design Guidelines

ID 683196
Date 5/15/2024
Public
Document Table of Contents

1.5.3.6. Ensure the download cable and JTAG pin voltages are compatible

The download cable interfaces with the JTAG pins of your device. The operating voltage supplied to the Intel FPGA download cable by the target board through the 10-pin header determines the operating voltage level of the download cable. The JTAG pins are powered by VCCIO.

In a JTAG chain containing devices with different VCCIO levels, the devices with a higher VCCIO level should drive the devices with the same or lower VCCIO level. A one-level shifter is required at the end of the chain with this device arrangement. If this arrangement is not possible, you have to add more level shifters into the chain.