MF1S5009

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Product data sheet

PUBLIC

Rev. 3 — 27 July 2010

189131

8 of 32

NXP Semiconductors

MF1S5009

Mainstream contactless smart card IC

9.2.3 Select card

With the select card command the reader selects one individual card for authentication

and memory related operations. The card returns the Select Acknowledge (SAK) code

which determines the type of the selected card, see Section 10.4. For further details refer

to the document Ref. 2, the handling of double size UIDs in MIFARE Classic is described

in Ref. 6.

9.2.4 Three pass authentication

After selection of a card the reader specifies the memory location of the following memory

access and uses the corresponding key for the three pass authentication procedure. After

a successful authentication all memory operations are encrypted.

Fig 5.

Three pass authentication

001aam202

REQUEST STANDARD

Transaction Sequence

Typical Transaction Time

SELECT CARD

POR

TRANSFER

ANTICOLLISION LOOP

GET IDENTIFIER

3 PASS AUTHENTICATION

ON SPECIFIC SECTOR

READ

BLOCK

WRITE

BLOCK

DECRE-

MENT

INCRE-

MENT

RE-

STORE

HALT

REQUEST ALL

Identification and Selection

Procedure

without collision

~3 ms

Authentication

Procedure

~3 ms

for each collision

+~3 ms

Memory

Operations

read block

~2.5 ms

write block

~6.0 ms

de-/increment

~2.5 ms

transfer

~4.5 ms