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Table 3.3 lists the ETM registers. This section describes each of the registers.
In the register bit description tables, the Version column indicates:
differences in how the bit is used in different architecture versions
the first version of the architecture that uses the bit.
Register bits are reserved in architecture versions earlier than the first use shown in the Version column. You must treat these reserved bits as read unknown and Write-As-Zero, unless the register description indicates otherwise.