2.1 EEPROM Data Zone

The data zone has a total of 4 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.

Table 2-2. Data Zone
Slot	Blocks	Bytes	Bits	Typical Use	Notes
0	1	32	256	I/O Protection Key	Key can be written in the clear. When written, it is recommended that this slot be locked. No Read access.
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	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 slot 3 of the SHA105-TFLXAUTH must be the same as the key stored in the client device or the key that was used to generate a diversified key in the client device.