Intel® Stratix® 10 Device Design Guidelines

ID 683738
Date 8/24/2022
Document Table of Contents

JTAG Pin Connections

Table 35.  JTAG Pin Connections Checklist
Number Done? Checklist Item
1   Connect JTAG pins correctly to the download cable header. Ensure the pin order is not reversed.
2   To disable the JTAG state machine during power-up, pull the TCK pin low through a resistor to ensure that an unexpected rising edge does not occur on the TCK pin.
3   Pull the TMS and TDI pins high through a resistor.

A device operating in JTAG mode uses four required pins—TDI, TDO, TMS, and TCK. The TCK pin has an internal weak pull-down resistor, while the TDI and TMS pins have weak internal pull-up resistors.

If you have more than one device in the chain, connect the TDO pin of a device to the TDI pin of the next device in the chain.

Noise on the JTAG pins during configuration, user mode, or power-up can cause the device to go into an undefined state or mode.