P5DF081 datasheet(23/36 Pages) NXP

23 / 36 page

P5DF081_SDS

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Objective short data sheet

PUBLIC

Rev. 1 — 12 August 2010

191710

23 of 36

NXP Semiconductors

P5DF081

MIFARE SAM AV2

MF_Decrement

Decrement one or several value blocks on a MIFARE card. Every decrement is confirmed

automatically by sending the Transfer command directly afterwards. The user has to define

the source address of the value block to be decremented and the destination address of the

value block to store the result. If more than one block is decremented, the MIFARE SAM AV2

accesses the blocks in the same order as addresses listed in the command data field.

MF_Restore

Copy one or several value blocks on a MIFARE card. If more than one block is copied, the

MIFARE SAM AV2 accesses the blocks in the same order as addresses listed in the

command data field. The order of the status code is the same as the order of addresses in the

data field.

MF_Authenticated

Read

Performs an authentication with subsequent reading of blocks on a MIFARE card. The

command allows authenticating and reading several different blocks on the card within one

command. Several blocks can be read without re-authenticating, but also several blocks with

different authentications. For each block address needing a new authentication, the key to

authenticate with and whether it shall be diversified has to be specified. If a key is used for

accessing different blocks but a new authentication is necessary, these blocks have to be

listed consecutively in the data field and the re-use to be indicated by a flag. If more than one

block is read, the MIFARE SAM AV2 accesses the blocks in the same order as addresses

listed in the command data field. The order of the returned data is the same as the order of

addresses in the data field.

MF_Authenticated

Write

Performs an authentication with subsequent writing of blocks on a MIFARE card. The

command allows authenticating and writing several different blocks on the card within one

command. Several blocks can be written without re-authenticating, but also several blocks

with different authentications. For each block address needing a new authentication, the key

to authenticate with and whether it shall be diversified has to be specified. If a key is used for

accessing different blocks, these blocks have to be listed consecutively in the data field and

the re-use to be indicated by a flag. If more than one block is written, the MIFARE SAM AV2

accesses the blocks in the same order as addresses listed in the command data field.

MF_ChangeKey

This command is intended to change a key in a MIFARE card. The command offers the possibility to

prepare and write an encrypted data stream to a MIFARE 1k or MIFARE 4k card containing the desired

keys and the given access conditions. The first case requires an active MIFARE authentication for

producing the stream to be sent to the card.

This command is able to generate a diversified MIFARE standard key, based on a MIFARE key stored in

the MIFARE SAM AV2, a TDEA key stored in the MIFARE SAM AV2, the UID of the MIFARE standard

PICC and the block address on the MIFARE standard card. The TDEA key applied for the diversification

is referenced in the MIFARE key entry.

Table 15.

MIFARE Classic in X-mode commands …continued

Command

Description

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