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AT88SC102

1K EEPROM– Security Logic with Two Application Zones

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5. Memory Map

Table 5-1. AT88SC102 Memory Diagram

Bit Address

Description

0–15

Fabrication Zone (FZ)

16–79

Issuer Zone (IZ)

80–95

Security Code (SC)

96–111

Security Code Attempts counter (SCAC)

112–175

Code Protected Zone (CPZ)

176–687

Application Zone 1 (AZ1)

688–735

Application Zone 1 Erase Key (EZ1)

736–1247

Application Zone 2 (AZ2)

1248–1279

Application Zone 2 Erase Key (EZ2)

1280–1407

Application Zone 2 Erase Counter (EC2)

1408–1423

Memory Test Zone (MTZ)

1424–1439

Manufacturer’s Zone (MFZ)

1440–1455

Block Write/Erase

1456–1471

MANUFACTURER’S FUSE

1529

EC2EN FUSE (Controls use of EC2)

1552 - 1567

ISSUER FUSE

AT88SC102

Bits

Words

16

1

64

4

16

1

16

1

64

4

512

32

48

3

512

32

32

2

128

8

16

1

16

1

16

1

16

1

1

16

1

6. Memory Zones

Table 6-1. Memory Zones

Zone

Definition

Fabrication Zone

FZ (16 bits)

The 16-bit fabrication zone is programmed when the chip is manufactured and cannot be changed.

Application software may check this fabrication zone code to assure that the device was manufactured

by Atmel.

Issuer Zone

IZ (64 bits)

The 64-bit issuer zone is programmed by the card issuer during the personalization phase. It will

contain issuer-specific information, such as serial numbers and dates. This area becomes read-only

after the issuer fuse has been blown. Read access is always allowed in the issuer zone.

Security Code

SC (16 bits)

The card security code is initially set by Atmel to protect the card during transportation to the card

issuer. During personalization, this code must be verified by the AT88SC102 to allow access to the

EEPROM memory. After the security code has been verified, the code itself may be changed in either

security mode. While in personalization mode (Security Level 1), the security code gives erase and

write access to both the application zones and the code protected zone. In Security Level 2, the

security code gives write access to both the application zones and the code protected zone. Erase

access requires verification of both the security code and the erase key (EZ1 or EZ2). Verification of

the security code will set the internal flag SV to “1”. Atmel ships the device with a security code

(transportation code) pre-programmed. This protects against the unauthorized use of an

unpersonalized device and should be written to a new value during initialization.

5

1419C–SMEM–6/08

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