SRTAG512L datasheet(11/51 Pages) STMICROELECTRONICS

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SRTAG512L

SRTAG512L memory management

3.1

Memory structure

The SRTAG512L supports the NDEF Tag Application as defined in the NFC Forum Type 4

Tag. The SRTAG512L is composed of three files:

•

One Capability Container file

•

One NDEF file

•

One System file: this file is an ST-proprietary file

The System file contains some information on the configuration of the SRTAG512L device.

The CC file gives some information about the SRTAG512L itself and the NDEF file. The

NDEF file contains the User data.

3.1.1

File identifier

The file identifier is the value used in the Select command to select a file.

3.1.2

CC file layout

The CC file gives some information about the SRTAG512L and the NDEF file. This file is a

read-only file for the RF host and cannot be modified by issuing a write command.

The T field, Read Access and Write Access fields can be changed by the RF host by issuing

a specific process (refer to Section 7: Functional procedures).

Table 3. File identifier

File identifier

Meaning

0xE101

System file

0xE103

CC file

0x0001

NDEF file

Table 4. CC file layout for 1 NDEF file

File offset

Meaning

Value

Comments

0x0000

Length CC file

0x000F

15 bytes

0x0002

Mapping version(1)

0x20 or 0x10

V 2.0 or V 1.0

0x0003

Maximum number of bytes that can be read

0x0040

64 bytes

0x0005

Maximum number of bytes that can be written 0x0036

54 bytes

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