P5DF081 datasheet(22/36 Pages) NXP

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P5DF081_SDS

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Objective short data sheet

PUBLIC

Rev. 1 — 12 August 2010

191710

22 of 36

NXP Semiconductors

P5DF081

MIFARE SAM AV2

8.6.10 MIFARE Classic in X-mode commands

The commands in this section can both be used to execute a transaction with a MIFARE

Classic card and with a MIFARE Plus card in SL2. In the second case, MF_Authenticate,

MF_AuthenticatedRead or MF_AuthenticatedWrite is to be used after MFP_Authenticate

to complete a MFP SL2 authentication. Afterwards, the other MF_xxx commands can be

used for further processing.

ISO14443-4_Init

Initialize the T = CL protocol. The intent of this command is to configure the

protocol for data exchanges. This is necessary if a card was already

activated and configured for doing data exchanges without using the

ISO14443-4_RATS_PPS command.

ISO14443-4_Exchange

Exchange bytes according to ISO/IEC 14443-4 T = CL protocol.

ISO14443-4_PresenceCheck

Check if an activated card is still in the field.

ISO14443-4_Deselect

Deselect an activated card. The CID is freed by this command. If the deselect

fails, the CID will not be freed and cannot be used for activating another card.

This behavior might be overridden by setting a flag in the P1 byte. CIDs can

also be freed using the ISO14443-4_FreeCID command.

ISO14443-4_FreeCID

Free one, more, or all currently assigned CIDs. This command might be

necessary if several deselect commands failed and the CIDs were not forced

to be freed but the card is deactivated or no longer available in the field.

Table 14.

ISO14443 commands …continued

Command

Description

Table 15.

MIFARE Classic in X-mode commands

Command

Description

MF_Authenticate

Performs an authentication with a MIFARE card. The MIFARE key has to be stored in the

MIFARE SAM AV2 and is referenced by a parameter in the command data field. The key can

be diversified if necessary.

MF_Read

Read one or several blocks of a MIFARE card and return the data. 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_Write

Write one or several blocks of a MIFARE card. 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. The command supports writing of 16 bytes encrypted for MIFARE 1k and MIFARE 4k

cards as well as writing 16 bytes or 4 bytes plain for MIFARE Ultralight cards. The length can

be selected by bit 0 of parameter byte P2. If 16 bytes block write is selected, the MIFARE

SAM AV2 decides whether encryption shall be used by checking the authentication state. If a

MIFARE authentication has been completed, the data is encrypted. Encrypted writing of 4

byte blocks is not supported.

MF_ValueWrite

Write one or several value blocks of a MIFARE card. 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. Since a MIFARE card uses 12 bytes for storing a four-byte value, the

address to write in the last four bytes has to be specified by the user (’address’ parameter).

MF_Increment

Increment one or several value blocks on a MIFARE card. Every increment is confirmed

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

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

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

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

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