ST25DV64K datasheet(15/200 Pages) STMICROELECTRONICS

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Ends of Areas 3 and 2 must first be set to the end of memory while respecting the following order:

If ENDA3 ≠ end of user memory, then set ENDA3 = end of memory; else, do not write ENDA3.

If ENDA2 ≠ end of user memory, then set ENDA2 = end of memory; else, do not write ENDA2.

Then, desired area limits can be set respecting the following order:

Set new ENDA1 value.

Set new ENDA2 value, with ENDA2 > ENDA1

Set new ENDA3 value, with ENDA3 > ENDA2

Example of successive user memory area setting (for a ST25DV64K-xx):

Initial state, 2 Areas are defined:

ENDA1 = 10h (Last block of Area 1: (10h x 8) + 7 = 0087h)

ENDA2 = FFh (Last block of Area 2: (FFh x 8) + 7 = 07FFh)

ENDA3 = FFh (No Area 3)

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Area 1 from Block 0000h to 0087h (136 Blocks)

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Area 2 from Block 0088h to 07FFh (1912 Blocks)

◦

There is no Area 3

◦

There is no Area 4

Split of user memory in four areas:

ENDA3 is not updated as it is already set to end of memory

ENDA2 is not updated as it is already set to end of memory

Set ENDA1 = 3Fh (Last block of Area 1: (3Fh x 8) + 7 = 01FFh)

Set ENDA2 = 5Fh (Last block of Area 1: (5Fh x 8) + 7 = 02FFh)

Set ENDA3 = BFh (Last block of Area 1: (BFh x 8) + 7 = 05FFh)

◦

Area1 from Block 0000h to 01FFh (512 Blocks)

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Area2 from Block 0200h to 02FFh (256 Blocks)

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Area3 from Block 0300h to 05FFh (768 Blocks)

◦

Area4 from Block 0600h to 07FFh (512 Blocks).

Return to a split in two equal areas:

Set ENDA3 = FFh

Set ENDA2 = FFh

Set ENDA1 = 7Fh (Last block of Area 1: (7Fh x 8) + 7 = 03FFh)

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Area1 from Block 0000h to 03FFh (1024 Blocks)

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Area2 from Block 0400h to 07FFh (1024 Blocks)

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There is no Area3

◦

There is no Area 4

Programming ENDA3 to FFh in step 2.a would have resulted in into an error, since rule ENDAi-1 < ENDAi would

not been respected (ENDA2 = ENDA3 in that case).

Registers for user memory area configuration

Table 5. ENDA1 access

I2C

Command

Type

Address

Type

Read Configuration (cmd code A0h) @05h

Write Configuration (cmd code A1h) @05h

R always, W if RF configuration security

session is open and configuration not locked

E2 = 1, 0005h

R always, W if I2C security

session is open

ST25DV04K ST25DV16K ST25DV64K

User memory

DS10925 - Rev 9

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