Visible to Intel only — GUID: mcn1464242653625
Ixiasoft
Visible to Intel only — GUID: mcn1464242653625
Ixiasoft
JTAG Pin Connections
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.
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