MF1ICS50_001056

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Product data sheet

PUBLIC

Rev. 5.6 — 24 November 2010

001056

12 of 20

NXP Semiconductors

MF1ICS50

Functional specification

6.7.1 Access conditions

The access conditions for every data block and sector trailer are defined by 3 bits, which

are stored non-inverted and inverted in the sector trailer of the specified sector.

The access bits control the rights of memory access using the secret keys A and B. The

access conditions may be altered, provided one knows the relevant key and the current

access condition allows this operation.

Remark: With each memory access the internal logic verifies the format of the access

conditions. If it detects a format violation the whole sector is irreversible blocked.

Remark: In the following description the access bits are mentioned in the non-inverted

mode only.

The internal logic of the MF1ICS50 ensures that the commands are executed only after an

authentication procedure or never.

Table 2.

Access conditions

Access Bits

Valid Commands

Block

Description

read, write

→

3

sector trailer

read, write, increment, decrement,

transfer, restore

→

2

data block

read, write, increment, decrement,

transfer, restore

→

1

data block

read, write, increment, decrement,

transfer, restore

→

0

data block

Fig 9.

Access conditions