MF2DL1000DA4SLASH02 datasheet(88/132 Pages) NXP

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NXP Semiconductors

MF2DL(H)x0

MIFARE DESFire Light contactless application IC

MF2DL_H_x0

All information provided in this document is subject to legal disclaimers.

Product data sheet

Rev. 3.3 — 5 April 2019

COMPANY PUBLIC

430733

88 / 132

11.8.2 WriteData

The WriteData command allows writing data to StandardData Files. MF2DL(H)x0

supports tearing protection for data that is sent within one communication frame to the

file. Consequently, when using ISO/IEC 14443-4 chaining to write to a StandardData file,

each frame itself is tearing protected but an interrupted chaining can lead to inconsistent

files. Using single-frame WriteData commands instead of using the chaining can enable

better control of the overall write process.

Depending on the communication mode settings of the Data file, data needs to be sent

with either CommMode.Plain, CommMode.MAC or CommMode.Full. All cryptographic

operations are done in CBC mode. In case of CommMode.MAC or CommMode.Full,

the validity of data is verified by the PICC by checking the MAC. If the verification fails,

the PICC stops further user memory programming and returns an Integrity Error to the

PCD. As a consequence of the Integrity Error, any transaction, which might have begun,

is automatically aborted. This can lead to the same situation as described above for an

interrupted WriteData using chained communication.

aaa-032212

PICC to PCD

PCD to PICC

CLA

CMD

Response data

SW1

status

SW2

FileNo

Offset

Length

up to 248

Data

Figure 29. WriteData command protocol

Table 90. Command parameters description - WriteData

Name

Length

Value

Description

Command Header Parameters

Cmd

8Dh

Command code.

File number of the targeted file.

Bit 7-5

000b

RFU

File number

FileNo

Bit 4-0

Full range

Offset

000000h ..

(FileSize - 1)

Starting position for the write operation.

Length

000001h ..

(FileSize -

Offset)

Number of bytes to be written.

Command Data Parameters

Data

up to 248

byte including

secure

messaging

Full range

Data to be written.

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