AN 100: In-System Programmability Guidelines

ID 683546
Date 9/22/2014
Document Table of Contents

1.4.4. Random Signals on JTAG Pins

During normal operation, TAP controller of each device must be in the test-logic-reset state.

To force the device back into this state, try pulling the TMS signal high and pulsing the TCK signal six times. If the device successfully powers up, you must add a higher pull-down resistor on the TCK signal.