AN3408 datasheet(11/38 Pages) STMICROELECTRONICS

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AN3408

NDEF data

2.3

NDEF message using TLV format

A TLV format is a generic data structure used to embed information and to store NDEF

messages. The TLV format is composed of three fields:

•

Type field (T)

•

Length field (L)

•

Value field (V): contained user message.

For more information on the TLV format, refer to [TAG-2] NFC forum – on page 1.

2.3.1

T field values

Table 12 below lists the T field values as defined by the NFC forum.

CC2

0x10

7:0

Data field and CC field size = 16*8 = 128 bytes

CC3

0x00

7:0

IC does not support Read multiple block

Table 10. CC field example (continued)

Byte name

Value

Bit

Function

Table 11. TLV format description

T field

L field

V field

Length (bytes)

1 or 3L field value

Data description

Type of TLV block,

see Table 12

Number of bytes of

V field

Data

Table 12. T field values and description

TLV block name

T field value

Description

NULL TLV

0x00

Used to padding.

Lock control TLV

0x01

It defines details of the lock bits.

Memory control TLV

0x02

It identifies reserved memory areas.

NDEF message TLV

0x03

It contains NDEF message.

Proprietary TLV

0xFD

Tag proprietary information.

Terminator TLV

0xFE

Last TLV block in the data area.

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