MF1S5009

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© NXP B.V. 2010. All rights reserved.

Product data sheet

PUBLIC

Rev. 3 — 27 July 2010

189131

13 of 32

NXP Semiconductors

MF1S5009

Mainstream contactless smart card IC

9.7.1 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 MF1S5009 ensures that the commands are executed only after

an authentication procedure or never.

Table 5.

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 10. Access conditions

001aam207

15

14

13

12

11

10

9

8

7

6

5

4

3

2

1

Byte Number

0

Key A

Key B (optional)

Access Bits

Byte 6

7

Bit

6543210

Byte 7

Byte 8

Byte 9