ARM Architecture Reference Manual ARMv7-A and ARMv7-R edition

Non-invasive Debug Authentication
Table C7-2 shows the non-invasive debug authentication for ARMv7 processors that implement the Security
Extensions.
Table C7-2 v7 Debug non-invasive debug authentication, Security Extensions implemented
Note
Signals
DBGEN NIDEN SPIDEN SPNIDEN
SDER.
SUNIDEN
Modes in which non-invasive
debug is permitted
LOW LOW x x x None. Non-invasive debug is disabled.
LOW HIGH LOW LOW 0 All modes in Non-secure state
LOW HIGH LOW LOW 1 All modes in Non-secure state,
Secure User mode.
LOW HIGH LOW HIGH x All modes in both security states.
LOW HIGH HIGH x x All modes in both security states.
HIGH x LOW LOW 0 All modes in Non-secure state.
HIGH x LOW LOW 1 All modes in Non-secure state,
Secure User mode.
HIGH x LOW HIGH x All modes in both security states.
HIGH x HIGH x x All modes in both security states.
The value of the SDER.SUIDEN bit does not have any effect on non-invasive debug.
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