ST25TA64K datasheet(12/45 Pages) STMICROELECTRONICS

12 / 45 page

ST25TA64K memory management

ST25TA64K

12/45

DocID027764 Rev 1

3.1.3

NDEF file layout

The NDEF file contains the NDEF message which contains the User data. The RF host host

can read and write data inside the file. The first two bytes named NDEF Message Length

define the size of the NDEF message. The NDEF Message Length shall be managed by the

application and the ST25TA64K device does not check if its value is relevant vs the data

written by the RF host. The ST25TA64K device uses the NDEF Message Length, e. g. the

standard read can be processed only inside the NDEF message; otherwise, the

ST25TA64K device returns an error code. For more details about the read command, refer

to Section 5.6.7: ReadBinary command.

Table 3. CC file layout for 1 NDEF file

File offset

Meaning

Value

Comments

0x0000

Number of bytes of CC file

0x000F

15 bytes

0x0002

Mapping version(1)

1. According to the reader.

0x20 or 0x10

V 2.0 or V 1.0

0x0003

Maximum number of bytes that can be read

0x00F6

246 bytes

0x0005

Maximum number of bytes that can be written

0x00F6

246 bytes

0x0007

NDEF file control TLV

0x04 (2)

2. Delivery state.

T field

0x0008

0x06

L field

0x0009

0x0001

FileID

0x000B

0x2000

Maximum NDEF

file size

0x000D

0x00 (2)

Read access

0x000E

0x00 (2)

Write access

Table 4. NDEF file layout

File offset

Byte 0

Byte 1

Byte 2

Byte 3

0x0000

NDEF message length

User data

0x0004

User data

...

0x1FFC

...

User data

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