MF1ICS50_001056

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Product data sheet

PUBLIC

Rev. 5.6 — 24 November 2010

001056

13 of 20

NXP Semiconductors

MF1ICS50

Functional specification

6.7.2 Access conditions for the sector trailer

Depending on the access bits for the sector trailer (block 3) the read/write access to the

keys and the access bits is specified as ‘never’, ‘key A’, ‘key B’ or key A|B’ (key A or

key B).

On chip delivery the access conditions for the sector trailers and key A are predefined as

transport configuration. Since key B may be read in transport configuration, new cards

must be authenticated with key A. Since the access bits themselves can also be blocked,

special care should be taken during personalization of cards.

Remark: the grey marked lines are access conditions where key B is readable and may

be used for data.

Table 3.

Access conditions for the sector trailer

Access bits

Access condition for

Remark

KEYA

Access bits

KEYB

C1

C2

C3

read

write

read

write

read

write

0

0

0

never

key A

key A

never

key A

key A

Key B may be read

0

1

0

never

never

key A

never

key A

never

Key B may be read

1

0

0

never

key B

key

A|B

never

never

key B

1

1

0

never

never

key

A|B

never

never

never

0

0

1

never

key A

key A

key A

key A

key A

Key B may be read,

transport configuration

0

1

1

never

key B

key

A|B

key B

never

key B

1

0

1

never

never

key

A|B

key B

never

never

1

1

1

never

never

key

A|B

never

never

never