0x0 Data value comparators not implemented.
NUMACPPAIRS, [3:0]
Indicates the number of address comparator pairs available for tracing:
0x4 Four address comparator pairs are implemented.
The TRCIDR4 can be accessed through the external debug interface, offset 0x1F0.
C11 ETM registers
C11.36 ID Register 4
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C11-781
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