ST25DV04KC datasheet(21/203 Pages) STMICROELECTRONICS

21 / 203 page

4.5

Fast transfer mode mailbox

ST25DVxxKC fast transfer mode uses a dedicated mailbox buffer for transferring messages between RF and I2C

worlds. This mailbox contains up to 256 Bytes of data which are filled from the first byte.

Fast transfer mode mailbox is accessed in bytes from both RF and I2C.

In RF, mailbox is read via a dedicated (Fast) Read Message command. Read can start from any address value

inside the mailbox, between 00h and FFh. Writing in the mailbox is done via the (Fast) Write Message command

in one shot, always starting at mailbox address 00h. No password is needed to access mailbox from RF, but fast

transfer mode must be enabled.

In I2C, mailbox read can start from any address value between 2008h and 2107h. Write mailbox MUST start from

address 2008h to a max of 2107h. No password is needed to access mailbox from I2C, but fast transfer mode

must be enabled.

The table below shows the map of fast transfer mode mailbox, as seen by RF interface and by I2C interface.

Table 15. Fast transfer mode mailbox memory map

RF access

Fast transfer mode buffer

I2C access

Address

Type

Name

Function

Device

select

Address

Type

00h

R/W

MB_Dyn Byte 0

Fast transfer mode buffer (256-Bytes)

E2=0, E1=1

2008h

R/W

01h

R/W

MB_Dyn Byte 1

E2=0, E1=1

2009h

R/W

…

E2=0, E1=1

...

FEh

R/W

MB_Dyn Byte 254

E2=0, E1=1

2106h

R/W

FFh

R/W

MB_Dyn Byte 255

E2=0, E1=1

2107h

R/W

ST25DV04KC ST25DV16KC ST25DV64KC

Fast transfer mode mailbox

DS13519 - Rev 3

page 21/203

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