3 Class-B Devices

Class-B devices have a different offering than Class-A devices. Class-B devices offer UID_REGS registers in the OTP for device identification. The UID_REGS registers consists of a 256-bit value that is made up of both pseudo-random and sequential parts. This value can be used as a seed for code encryption. The first 192 bits are pseudo-random, the next 32 bits are sequential, and the last 32 bits are a fletcher checksum value of the previous 224 bits.

The 32-bit sequential value is the UID_UNIQUE device identification register and is unique for all devices of a particular device family (for example, F2807x, F2837x, and so on). Due to this, the 256-bit value is also unique.