LAR (A53_ETM_2) Register

Zynq UltraScale+ Devices Register Reference (UG1087)

Document ID
UG1087
Release Date
2024-03-13
Revision
1.10

LAR (A53_ETM_2) Register Description

Register NameLAR
Offset Address0x0000000FB0
Absolute Address 0x00FEE40FB0 (CORESIGHT_A53_ETM_2)
Width32
TypewoWrite-only
Reset Value0x00000000
DescriptionSoftware Lock Access Register

LAR (A53_ETM_2) Register Bit-Field Summary

Field NameBitsTypeReset ValueDescription
KEY31:0woWrite-only0Writing the key value 0xC5ACCE55 to this field clears the lock, enabling write accesses to this components registers through a memory-mapped interface.Writing any other value to this register sets the lock, disabling write accesses to this components registers through a memory mapped interface.Software can use the Software Lock to prevent accidental modification of the trace unit registers by software being debugged. For example, software that accidentally initializes an incorrect region of memory might disable the trace unit and make it impossible to trace the software.