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Memory organization for STMicroelectronics ISO/IEC 15693 products

1

Memory organization for STMicroelectronics

ISO/IEC 15693 products

The ST ISO/IEC 15693 contactless tag (LRI1K, LRI2K, LRIS2K, LRIS64K) and the dual

interface memory (M24LRxx) is divided into three different areas:

•

User memory area, where the user can read and write data.

•

System area, which contains UID, DSFID and AFI fields.

•

Protection system area, which contains the user memory area protection.

Access rights to the different memory fields are given in Table 2.

For more details on the protection system, refer to the corresponding STMicroelectronics

datasheet.

1.1

User memory area

The user memory stores NDEF messages. This area can be write-protected by the user.

The user memory size depends on ISO/IEC 15693 contactless tag, as shown in Table 3.

Note:

M24LR64E-R and M24LR16E-R have a specific format for read and write commands. Their

block number is coded on two bytes instead of one. For more details, refer to LRIS64K,

M24LR16E-R and M24LR64E-R datasheets.

Table 2. Access rights to memory fields

Operation

User memory

area

System area

Protection

system

UID

DSFID and AFI

Read

Yes

Yes

Yes

Yes

Write

Yes

No

Yes

Yes

Lock

Yes

Locked by IC

manufacturer

Yes

NA

Table 3. ST ISO/IEC 15693 memory size

LRI1K

LRI2K

LRIS2K

LRIS64K

M24LR04E-R M24LR16E-R M24LR64E-R

User memory

size

1

kbit

2

kbits

2

kbits

64 kbits

2

kbits

16

kbits

64

kbits

128 bytes

256 bytes

256 bytes

8192 bytes

512 bytes

2048 bytes

8192 bytes

First RF block

0

0

0

0

0

0

0

Last RF block

31

63

63

2047

127

511

2047

NDEF memory

size

128 bytes

(1)

256 bytes

(1)

256 bytes

(1)

8192 bytes

(1) (2)

512 bytes (1)

2048 bytes

(1) (2)

8192 bytes

(1) (2)

1.

NDEF memory size includes User area and CC field memory area.

2.

If NDEF message size exceeds 2040 bytes, bit 2 of CC3 shall be set (see Chapter 2.2: Capability container field).