MF1S5009DA4 datasheet(12/32 Pages) NXP

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MF1S5009

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Product data sheet

PUBLIC

Rev. 3 — 27 July 2010

189131

12 of 32

NXP Semiconductors

MF1S5009

Mainstream contactless smart card IC

9.6.3 Sector trailer (block 3)

Each sector has a sector trailer containing the

• secret keys A and B (optional), which return logical “0”s when read and

• the access conditions for the four blocks of that sector, which are stored in bytes 6...9.

The access bits also specify the type (read/write or value) of the data blocks.

If key B is not needed, the last 6 bytes of block 3 can be used as data bytes.

Byte 9 of the sector trailer is available for user data. For this byte the same access rights

as for byte 6, 7 and 8 apply.

All keys are set to FFFFFFFFFFFFh at chip delivery.

9.7 Memory access

Before any memory operation can be carried out, the card has to be selected and

authenticated as described previously. The possible memory operations for an addressed

block depend on the key used and the access conditions stored in the associated sector

trailer.

Fig 9.

Sector trailer

001aam206

Byte Number

Key A

Key B (optional)

Access Bits

Description

Table 4.

Memory operations

Operation

Description

Valid for Block Type

Read

reads one memory block

read/write, value and sector trailer

Write

writes one memory block

read/write, value and sector trailer

Increment

increments the contents of a block and

stores the result in the internal data

value

Decrement

decrements the contents of a block and

stores the result in the internal data

value

Transfer

writes the contents of the internal data

value

Restore

reads the contents of a block into the

internal data register

value

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