136430

© NXP B.V. 2007. All rights reserved.

Product data sheet

Rev. 3.0 — 14 March 2007

6 of 28

NXP Semiconductors

SL2 ICS50/SL2 ICS51

I•CODE SLI-L/I•CODE SLI-L HC

PUBLIC

7. Functional description

7.1 Block description

The label requires no internal power supply. Its contactless interface generates the power

supply and the system clock via the resonant circuitry by inductive coupling to the

interrogator. The interface also demodulates data that are transmitted from the

interrogator to the I•CODE Label, and modulates the electromagnetic field for data

transmission from the I•CODE Label to the interrogator.

Data are stored in a non-volatile memory (EEPROM). The EEPROM has a memory

capacity of 512 bit and is organized in 16 blocks consisting of 4 bytes each (1 block =

32 bits). The higher 8 blocks contain user data and the lowest 8 blocks contain the unique

identifier, the write access conditions and special data like AFI and DSFID.

7.2 Memory organization

The 512 bit EEPROM memory is divided into 16 blocks. A block is the smallest access

unit. Each block consists of 4 bytes (1 block = 32 bits). 4 blocks are summed up to 1 page.

Bit 0 in each byte represents the least significant bit (LSB) and bit 7 the most significant bit

(MSB), respectively.

The Memory is divided into 2 parts:

• Configuration Area

– Within this part of the memory all required information are stored like UID, Write

protection, Passwords and so on. Direct access to this memory area is not

possible.

• User Memory

– Within this area the user data are stored. Direct Read/write access to this part of

the memory is possible depending on the related write protection conditions.