2.1 EEPROM Data Zone
The data zone has a total of 3 usable slots where write access restrictions are individually programmable. The following table lists the typical uses for each slot, along with any special characteristics of data for that slot.
| Slot | Blocks | Bytes | Bits | Typical Use | Notes |
|---|---|---|---|---|---|
| 1 | 10 | 320 | 2560 | User Data | Slot can be locked when written or can be left open to be updated. |
| 2 | 2 | 64 | 512 | User Data | Slot can be locked when written or can be left open to be updated. |
| 3 | 1 | 32 | 256 | Secret Key or Diversified Key | Can be written in the clear or via an encrypted Write. Slot must be locked before deployed in the field. No Read access. |
The secret key stored in the SHA104-TFLXAUTH may either be the secret key used for authentication in the system or may be a diversified key. The key diversification must be consistent with the ability of the host device to generate the diversified key from the parent secret key.