ST25TA64K datasheet(13/45 Pages) STMICROELECTRONICS

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ST25TA64K

ST25TA64K memory management

3.1.4

System file layout

The system file specifies the configuration of the ST25TA64K. Table 5 lists the different

fields.

3.2

Read and write access rights to the memory

An NDEF file can be locked for read or write accesses. It is also protected by a 128-bit

password that the host shall present before accessing the NDEF file. There are two 128-bit

passwords, one for the read access and the other one for the write access.

An NDEF file can be permanently locked for read or write accesses. Thus, the host cannot

access the NDEF file.

The read password shall be sent to the ST25TA64K device before reading a read-locked

NDEF file.

The write password shall be present on the ST25TA64K device before writing a write-locked

NDEF file. The write password shall be sent to change the read or write access. The read or

write access right is defined for the NDEF file.

3.2.1

State of the Read and Write access rights

Two bytes in the CC file are used to define the Read and Write access rights to the NDEF

file. For more details, refer to Section 3.1.2: CC file layout.

Table 5. Field list

File offset

Field name

Number

of bytes

Read

access

Write

access

Delivery state (1)

1. The delivery state for all passwords is 0x00000000000000000000000000000000.

0x0000

Length system file

0x0012

0x0002

0x01

0x0003

0x00

0x0004

ST reserved

0x11

0x0005

ST reserved

0x00

0x0006

0x0007

NDEF File number

(RFU)

none

0x00

0x0008

UID

none

0x02C4 xx xx xx xx xx(2)

x values are defined by ST to insure UID unicity.

0x000F

Memory Size

none

0x1FFF

0x0011

Product Code

none

0xC4

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