3.9.2. Meanings of terms and abbreviations used in this section

The following terms and abbreviations are used in the tables that summarize the access permissions:

Error

Slave-generated error response. Writes are Ignored and reads return an unknown value. For a memory-mapped access, an error is returned through the memory system. For a coprocessor access, an Undefined Instruction exception is taken.

NPoss

Not possible. Accessing the trace registers while the processor is powered down is not possible if a single power domain is implemented. The response is system dependent and implementation defined.

OK

The read or write access succeeds. Writes to RO locations are ignored. Reads from RAZ/WO locations return zero.

UNP

The access has unpredictable results. Reads return an unknown value.

WI

Writes Ignored. Reads return the register value.

RAZ

Reads-As-Zero.

UNK

Unknown

SBZP

Should-Be-Zero-or-Preserved.

CS Lock

CoreSight Lock. Indicated by the ETMLSR. See Lock Status Register, ETMLSR, ETMv3.2 and later. This is one of the Management registers.

Note

The CoreSight Lock is described as the Software Lock in previous issues of the ETM Architecture Specification.

ETM_PD

ETM Power Down status. Indicated by the ETM Power Down bit, bit [0] of the ETMCR. See Main Control Register, ETMCR.

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