8

AT88SC25616C

5017KS–SMEM–08/09

5.

Device Architecture

5.1.

User Zones

The EEPROM user memory is divided into 16 zones of 16,384 bits each. Multiple zones allow for different types of data

or files to be stored in different zones. Access to the user zones is allowed only after security requirements have been

met. These security requirements are defined by the user during the personalization of the device in the configuration

memory. If the same security requirements are selected for multiple zones, then these zones may effectively be

accessed as one larger zone.

Figure 8.

User Zones

Zone

$0

$1

$2

$3

$4

$5

$6

$7

$000

─

2048 Bytes

─

User 0

$7F8

$000

─

─

User 1

─

─

─

User 14

$7F8

$000

─

2048 Bytes

─

User 15

$7F8

6.

Control Logic

Access to the user zones occurs only through the control logic built into the device. This logic is configurable through

access registers, key registers and keys programmed into the configuration memory during device personalization.

Also implemented in the control logic is a cryptographic engine for performing the various higher-level security

functions of the device.