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The Authentication interface provides connections for the CoreSight Authentication signals.
There are two signals, dbgen and spiden that are both required to enable Secure AXI debug accesses. If dbgen is used on its own, that is dbgen = 1 and spiden = 0, then only Non-secure AXI debug accesses are allowed.
See the Arm® CoreSight™ Architecture Specification v2.0 for more information.