3.3.4. TAP reset

nTRST is the TAP controller reset, used to asynchronously reset the TAP controller. It also resets the ETM control register.

Note

ARM recommends that TCK is inhibited when nTRST is de-asserted. This ensures that the TAP state machine cannot enter an unknown state due to reset hold violations. You must hold TMS HIGH during a TAP reset.

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