Philips Semiconductors

Product Specification Rev. 3.1

February 2005

Functional Specification

Standard Label IC SL2 ICS20

7

3.2 Memory Organisation

The 1024 bit EEPROM memory is divided into 32 blocks. A block is the smallest access unit. Each block

consists of 4 bytes (1 block = 32 bits). Bit 0 in each byte represents the least significant bit (LSB) and bit 7

the most significant bit (MSB), respectively.

Byte 0

Byte 1

Byte 2

Byte 3

Block –4

UID0

UID1

UID2

UID3

Unique Identifier (lower bytes)

Block –3

UID4

UID5

UID6

UID7

Unique Identifier (higher bytes)

Block –2

Internally

used

EAS

AFI

DSFID

EAS, AFI, DSFID

Block –1

00

00

00

00

Write Access Conditions

Block 0

x

x

x

x

User Data

Block 1

x

x

x

x

Block 2

x

x

x

x

Block 3

x

x

x

x

Block 4

x

x

x

x

Block 5

x

x

x

x

Block 6

x

x

x

x

Block 7

x

x

x

x

Block 8

x

x

x

x

Block 9

x

x

x

x

Block 10

x

x

x

x

Block 11

x

x

x

x

Block 12

x

x

x

x

Block 13

x

x

x

x

Block 14

x

x

x

x

Block 15

x

x

x

x

Block 16

x

x

x

x

Block 17

x

x

x

x

Block 18

x

x

x

x

Block 19

x

x

x

x

Block 20

x

x

x

x

Block 21

x

x

x

x

Block 22

x

x

x

x

Block 23

x

x

x

x

Block 24

x

x

x

x

Block 25

x

x

x

x

Block 26

x

x

x

x

Block 27

x

x

x

x

User Data

The values (in hexadecimal notation) shown in the table above are stored in the EEPROM after the wafer

production process. The contents of blocks marked with ‘x’ in the table are not defined at delivery.

With read and write commands only blocks 0 to 27 can be addressed.