ST25DV04K datasheet(28/220 Pages) STMICROELECTRONICS

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Memory management

ST25DV04K ST25DV16K ST25DV64K

28/220

DocID027603 Rev 4

Organization of user memory in areas have the following characteristics:

•

At least one area exists (Area1), starting at Block/Byte address 0000h and finishing at

ENDA1, with ENDA1 = ENDA2 = ENDA3 = End of user memory (factory setting).

•

Two Areas could be defined by setting ENDA1 < ENDA2 = ENDA3 = End of user

memory.

•

Three Areas may be defined by setting ENDA1 < ENDA2 < ENDA3 = End of user

memory.

•

A maximum of four areas may be defined by setting ENDA1 < ENDA2 < ENDA3 < End

of user memory.

•

Area 1 specificities

–

Start of Area1 is always Block/Byte address 0000h.

–

Area1 minimum size is 8 Blocks (32 Bytes) when ENDA1 = 00h.

–

Area1 is always readable.

•

The last area always finishes on the last user memory Block/Byte address (ENDA4

doesn't exist).

•

All areas are contiguous: end of Area(n) + one Block/Byte address is always start of

Area(n+1).

Area size programming

RF user must first open the RF configuration security session to write ENDAi registers.

I2C host must first open I2C security session to write ENDAi registers.

Table 3. Maximum user memory Block and Byte addresses and ENDAi value

Device

Last user memory

block address seen

by RF

Last user memory

byte address seen by

I2C

Maximum

ENDAi

value

ST25DV04K-xx

007Fh

01FFh

0Fh

ST25DV16K-xx

01FFh

07FFh

3Fh

ST25DV64K-xx

07FFh

1FFFh

FFh

Table 4. Areas and limit calculation from ENDAi registers

Area

Seen from RF interface

Seen from I2C interface

Area 1

Block 0000h

…

Block (ENDA1*8)+7

Byte 0000h

…

Byte (ENDA1*32)+31

Area 2

Block (ENDA1+1)*8

…

Block (ENDA2*8)+7

Byte (ENDA1+1)*32

…

Byte (ENDA2*32)+31

Area 3

Block (ENDA2+1)*8

…

Block (ENDA3*8)+7

Byte (ENDA2+1)*32

…

Byte (ENDA3*32)+31

Area 4

Block (ENDA3+1)*8

…

Last memory Block

Byte (ENDA3+1)*32

…

Last memory Byte

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