MF2DLX0 datasheet(11/132 Pages) NXP

11 / 132 page

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

11 / 132

A StandardData file is not covered by the transaction mechanism and therefore does

not implement a transaction-based backup mechanism. Thus data are available to read

as soon as they are written in the file. The writing operations of single frames up to 128

bytes with a WriteData or ISOUpdateBinary command are also tearing protected.

8.2.3.2 Value file

The Value file stores the data as a 4 byte signed integer.

The Value file can be read with the GetValue command. The value can be manipulated

with Credit, Debit and LimitedCredit commands, respectively.

The value is restricted by an upper and lower limit that the current value of the file cannot

exceed.

The Value file can support a LimitedCredit feature as defined in Section 11.8.6. The free

GetValue allows a user to get freely the value of a value file bypassing an authentication

if necessary as long as there is one access condition associated with GetValue

command that is different from "no access" condition, see Section 11.5.1

The Value file implements a backup mechanism. All operations executed on a value file

within the current transaction will be effective only when a successful CommitTransaction

will be executed. Meanwhile or if the transaction is aborted or not successfully

committed, the previous value remains effective and is returned by a GetValue.

8.2.3.3 Record file

The record file is a CyclicRecord file which allows storing latest 4 records of 16-byte

(each record) size.

The record file adds up new records when a successful WriteRecord command is

executed. When the maximum number of records of the file is reached, the next new

record overwrites the oldest record as defined Section 11.8.8.

The record file implements a backup mechanism. All operations executed on a record file

within the current transaction are effective only when a successful CommitTransaction

command is executed.

If the transaction is aborted or not successfully committed the previous file image is

effective and returned by a ReadRecords command.

Within a record file, records are numbered starting with the latest record written. Meaning

that the latest record written has the number 0, the second latest record written has the

number 1 and so on. Its valid range is from 0 to the number of existing records

ExistingRecCount- 1 in the record file.

This indexing is used in the data management commands to address records within the

Record file.

Note that when reading out records, the records are returned in the chronological order

that they have been written, i.e. the oldest record is returned first.

8.2.3.4 TransactionMAC file

A TransactionMAC file is used to store Transaction MAC-related information. It consists

of the following items:

• Transaction MAC Counter (TMC) 4 byte unsigned integer. The TMC is initialized

to 00000000h on file creation. This value means that no Transaction MAC has

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