ST25DV64KC datasheet(15/203 Pages) STMICROELECTRONICS

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Table 5. 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

ST25DV04KC

007Fh

01FFh

0Fh

ST25DV16KC

01FFh

07FFh

3Fh

ST25DV64KC

07FFh

1FFFh

FFh

Table 6. 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

ST25DV04KC ST25DV16KC ST25DV64KC

User memory

DS13519 - Rev 3

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