Datasheet

Length Field

The Length Field (or L Field) contains the size (in bytes) of the value field. The Length Field can be organised in two

different ways, using either one or three bytes.

The one byte format simple contains a single byte value from 0x00..0xFF.

The three byte format consists of the following format:

Both the one byte and three byte format must be supported for NFC Forum and NDEF compatability.

Value Field

The Value Field (or V Field) is only present if the Length Field (described above) is present and not equal to 0x00. If

the Length Field is not equal to 0, the Value Fields will contain N bytes of data in the format indicated by the T Field

above.

The value field is where the payload (an NDEF Message, for example) is stored.

Terminator TLV

The Terminator TLV is the last TLV block in the data area, and consist of a single byte: 0x0FE (see the TLV Block Type

table above). This TLV Block in mandatory.

Memory Dump of a Mifare Classic 1K Card with an NDEF Record

TLV Block Types

Block Type Value Description

------------- ----- --------------------------------------

NULL 0x00 These blocks should be ignored

NDEF Message 0x03 Block contains an NDEF message

Proprietary 0xFD Block contains proprietary information

Terminator 0xFE Last TLV block in the data area

Byte 0: Always 0xFF to indicate that we are using the three byte format

Byte 1..2: Can be a value between 0x00FF and 0xFFFE

[ Start of Memory Dump ]

------------------------Sector 0-------------------------

Block 0 3E 39 AB 7F D3 88 04 00 47 41 16 57 4D 10 34 08 >9«Ó?..GA.WM.4.

Block 1 14 01 03 E1 03 E1 03 E1 03 E1 03 E1 03 E1 03 E1 ...á.á.á.á.á.á.á

Block 2 03 E1 03 E1 03 E1 03 E1 03 E1 03 E1 03 E1 03 E1 .á.á.á.á.á.á.á.á

Block 3 00 00 00 00 00 00 78 77 88 C1 00 00 00 00 00 00 ......xw?Á......

------------------------Sector 1-------------------------

Block 4 00 00 03 11 D1 01 0D 55 01 61 64 61 66 72 75 69 ....Ñ..U.adafrui

Block 5 74 2E 63 6F 6D FE 00 00 00 00 00 00 00 00 00 00 t.comþ..........

Block 6 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................

Block 7 00 00 00 00 00 00 7F 07 88 40 00 00 00 00 00 00 .......?@......

------------------------Sector 2-------------------------

Block 8 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................

Block 9 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................

Block 10 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................

Block 11 00 00 00 00 00 00 7F 07 88 40 00 00 00 00 00 00 .......?@......

------------------------Sector 3-------------------------

Block 12 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................

Block 13 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................