56.4.2 Temporary Secured Storage for Keys

The TDES provides secure storage for two sets of three 64-bit keys. The storage is available while VDDCORE voltage is supplied.

The keys can be only written in TDES internal registers and are not readable. Moreover, the internal registers holding the keys are buried in the overall product logic area during the physical implementation.

One set of keys can be loaded by software by writing the Key Word registers (TDES_KEYxWRy).

One key can be loaded by Private Key bus only.