ST25DV64K datasheet(14/200 Pages) STMICROELECTRONICS

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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

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.

When programming an ENDAi register, the following rule must be respected:

•

ENDAi-1 < ENDAi ≤ ENDAi+1 = End of memory.

This means that prior to programming any ENDAi register, its successor (ENDAi+1) must first be programmed to

the last Block/Byte of memory:

•

Successful ENDA3 programming condition: ENDA2 < ENDA3 ≤ End of user memory

•

Successful ENDA2 programming condition: ENDA1 < ENDA2 ≤ ENDA3 = End of user memory

•

Successful ENDA1 programming condition: ENDA1 ≤ ENDA2 = ENDA 3 = End of user memory

If this rule is not respected, an error 0Fh is returned in RF, NoAck is returned in I2C, and programming is not

done.

In order to respect this rule, the following procedure is recommended when programming Areas size (even for

changing only one Area size):

ST25DV04K ST25DV16K ST25DV64K

User memory

DS10925 - Rev 9

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