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1.6.2. Use a Pull-Down Resistor on the TCK Signal
You must hold the TCK signal low using a pull-down resistor to keep the JTAG test access port (TAP) in a known state at power-up.
A missing pull-down resistor can cause a device to power-up in the state of JTAG and its boundary-scan test (BST). This situation can cause conflicts on the board.
A typical resistor value is 1 kΩ.
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