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The peripheral protection controller gates transactions to peripherals based on whether there is a security violation.
The Base element contains a single APB Peripheral Protection Controller (PPC). This PPC does not have its own software accessible programming interface. Instead, control of this PPC resides in the Secure Privilege Control Block and Non-secure Privilege Control Block. See 3.4.6 Secure Privilege Control Block and 3.4.7 Non-secure Privilege Control Block.
See the Arm® CoreLink™ SIE-200 System IP for Embedded Technical Reference Manual.