ST25DV64K datasheet(25/200 Pages) STMICROELECTRONICS

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Figure 10. I2C to RF fast transfer mode operation

I2C host

ST25DV

Fast Transfer Mode mailbox

(256 Bytes)

Dynamic registers

MB_LEN_Dyn

MB_CRTL_Dyn

Static registers

MB_MODE

MB_WDG

ISO/IEC

15693 reader

I2C

GPO/RF_GET_MSG

Host message

1Mb/s

Up to

53kb/s

VCC supply source is mandatory to activate this feature.

No precedence rule is applied: the first request is served first.

Adding a message is only possible when fast transfer mode is enabled (MB_EN=1) and mailbox is free

(HOST_PUT_MSG and RF_PUT_MSG cleared, which is the case after POR or after complete reading of I2C

message by RF, and complete reading of RF message by I2C).

A watchdog limits the message availability in time: when a time-out occurs, the mailbox is considered free, and

the HOST_MISS_MSG or RF_MISS_MSG bits is set into MB_CTRL_Dyn register. The data contained in the

mailbox is not cleared after a read or after the watchdog has been triggered: message data is still available

for read and until fast transfer mode is disabled. HOST_CURRENT_MSG and RF_CURRENT_MSG bits are

indicating the source of the current data.

The message is stored in a buffer (256 Bytes), and the write operation is done immediately. .

Caution:

The data written in user or system memory (EEPROM), either from I2C or from RF, transits via the 256-Bytes

fast transfer mode's buffer. Consequently fast transfer mode must be deactivated (MB_EN=0) before starting

any write operation in user or system memory, otherwise command will be NotACK for I2C or get an answer 0Fh

for RF and programming is not done.

I2C access to mailbox

The access by I2C can be done by dedicated address mapping to mailbox (2008h to 2107h) with device identifier

E2 = 0.

I2C reading operation does not support rollover. Therefore data out is set to FFh when the counter reaches the

message end.

The RF_PUT_MSG is cleared after reaching the STOP consecutive to reading the last message byte, and the

mailbox is considered free (but the message is not cleared and it is still present in the mailbox).

A I2C reading operation will never clear HOST_PUT_MSG, and the message remains available for RF.

An I2C read can start at any address inside the mailbox (between address 2008h and 2107h).

A I2C write operation must start from the first mailbox location, at address 2008h. After reaching the Mailbox

border at address 2107h all bytes are NACK and the command is not executed (rollover feature not supported).

At the end of a successful I2C message write, the message length is automatically set into MB_LEN_Dyn register,

and HOST_PUT_MSG bit is set into MB_CTRL_Dyn register, and the write access to the mailbox is not possible

until the mailbox has been released again. MB_LEN_Dyn contains the size of the message in byte, minus 1.

ST25DV04K ST25DV16K ST25DV64K

Fast transfer mode (FTM)

DS10925 - Rev 9

page 25/200

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