Key Update Register

Zynq UltraScale+ Device Technical Reference Manual (UG1085)

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2.4 English

The key update register is used during boot to support the key rolling feature, where the different AES key must be loaded multiple times. After boot, any key can be loaded into this register via APB by software running on the PS. A 256-bit KUP key is stored in the eight AES key update registers.