7.6.5.5.12 Reseed Operation

With the Reseed operation, DRBG2 is reseeded with new entropy, and its reseed counter is reset.

New entropy always comes from DRBG1. In addition, external random entropy can be provided via PUF_DIR. The Data Source register (PUF_SRC) must be configured with 0x1.

The following table shows the number of bytes that must be provided per entropy source.

Table 7-12. Number of Bytes per Entropy Source for Reseed Operation
Entropy Source	Number of Bits	Number of Bytes
DRBG1	384	48
Entropy via PUF_DIR	1024	128

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