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Arm Cortex-A55 Core Technical Reference Manual : TRCPDCR, Power Down Control Register

TRCPDCR, Power Down Control Register

The TRCPDCR request to the system power controller to keep the ETM trace unit powered up.

Bit field descriptions

Figure D8-50 TRCPDCR bit assignments

RES0, [31:4]
PU, [3]

Powerup request, to request that power to the ETM trace unit and access to the trace registers is maintained:

0Power not requested.
1Power requested.

This bit is reset to 0 on a trace unit reset.

RES0, [2:0]

Bit fields and details not provided in this description are architecturally defined. See the Arm® Architecture Reference Manual Armv8, for Armv8-A architecture profile.

The TRCPDCR can be accessed through the external debug interface, offset 0x310.

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