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AR# 33786

JTAG - iMPACT/ChipScope/XMD/SDK - How do I connect the TRST pin on non-Xilinx devices in my JTAG chain?

Description

Some devices in my JTAG chain use the TRST pin. How do I connect the TRST pin on non-Xilinx devices in my JTAG chain?

Solution

The TRST pin is not supported by Xilinx tools. To use JTAG chains that contain devices with this pin, you must pull TRST high for all devices. This will allow the Xilinx tools that use JTAG to operate as normal. If not, you might see incorrect data and have problems connecting to the JTAG chain. This applies for all device and software versions.
AR# 33786
Date Created 11/11/2009
Last Updated 01/28/2013
Status Active
Type General Article