MF1ICS70_043544

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Product data sheet

PUBLIC

Rev. 4.4 — 25 November 2010

043544

12 of 20

NXP Semiconductors

MF1ICS70

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 MF1ICS70 ensures that the commands are executed only after an

authentication procedure or never.

[1]

For the first 32 sectors (first 2 Kbytes of NV-memory) the access conditions can be set individually for a

data area sized one block.

For the last 8 sectors (upper 2 Kbytes of NV-memory) access conditions can be set individually for a data

area sized 5 blocks.

Table 2.

Access conditions

Access Bits

Valid Commands

Block

Description

read, write

→

3

sector trailer

read, write, increment, decrement,

transfer, restore

→

2

data area[1]

read, write, increment, decrement,

transfer, restore

→

1

data area[1]

read, write, increment, decrement,

transfer, restore

→

0

data area[1]

Fig 9.

Access conditions