AN4054

Comparison between low-density and high-density devices

Doc ID 022825 Rev 3

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1.4

Memory mapping of ISO/IEC 15693 products

Table 6 lists the key parameters of the memory mapping of LRix and M24LRx devices.

The ISO/IEC 15693 specification defines the read or write command with a block number

coded on 1 byte.

The high-density products of the ISO/IEC 15693 family require a block number coding on 2

bytes. It is the extended addressing mode.

Table 7 lists the ISO/IEC 15693 products and their addressing mode.

As an example, the next two tables define the write single block command for low- and high-

density devices, and show the difference between the two density families.

Table 8 describes the format of the write single block RF command for low-density products.

The block number parameter is coded on 8 bits or 1 byte.

Table 9 is the write single block RF command for high-density products. The block number

parameter is coded on 16 bits or 2 bytes.

Table 6.

Memory mapping of LRix and M24LRx devices

Device

LRi1K

LRi2K

LRiS2K

LRiS64K

M24LR04E-R M24LR16E-R M24LR64x-R

Memory size

1 Kbit

2 Kbits

2 Kbits

64 Kbits

4 Kbits

16 Kbits

64 Kbits

Block size

32 bits

32 bits

32 bits

32 bits

32 bits

32 bits

32 bits

Number of blocks

0x1F

0x3F

0x3F

0x7FF

0x3F

0x1FF

0x7FF

Table 7.

Addressing mode of LRix and M24LRx devices

Device

LRi1K

LRi2K

LRiS2K

LRiS64K

M24LR04E-R

M24LR16E-R M24LR64x-R

Addressing mode

standard

standard

standard

extended

standard

extended

extended

Table 8.

Write single block request format for low-density products

SOF

Request_

flags

Write single

block

Block

number

Data

CRC16

EOF

8 bits

0x21

64 bits

8 bits

32 bits

16 bits

1.

Gray color means that the field is optional.

Table 9.

Write single block request format for high-density products

SOF

Request_

flags

Write single

block

Block

number

Data

CRC16

EOF

8 bits

0x21

64 bits

16 bits

32 bits

16 bits

1.

Gray color means that the field is optional.