ST25DV64K datasheet(164/220 Pages) STMICROELECTRONICS

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RF operations

ST25DV04K ST25DV16K ST25DV64K

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DocID027603 Rev 4

7.6.41

Fast Write Message

On receiving the Fast Write Message command, the ST25DVxxx puts the data contained in

the request into the mailbox buffer, updates the Message Length register MB_LEN_Dyn,

and set Mailbox loaded bit RF_PUT_MSG. It then reports if the write operation was

successful in the response. The ST25DVxxx mailbox contains up to 256 data bytes which

are filled from the first location '00'. MSGlength parameter of the command is the number of

Data bytes minus - 1 (00 for 1 byte of data, FFh for 256 bytes of data). Fast Write Message

can be executed only when Mailbox is accessible by RF (previous RF message was read or

time-out occurs, no I2C message to be read). User can check it by reading b1 of

MB_CTRL_Dyn “HOST_PUT_MSG”, which must be reset to “0”. (refer to Section 5.1: Fast

transfer mode (FTM)).

•

The data rate of the response is multiplied by 2 compared to Write Message command.

•

The Option_flag is not supported.

•

The Inventory_flag must be set to 0.

•

The subcarrier_flag should be set to 0, otherwise the ST25DVxxx answers with an

error code.

Request parameters:

•

Request flag

•

UID (optional)

•

Message Lenght

•

Message Data

Response parameters:

•

No parameter. The response is sent back after the write cycle.

Table 190. Fast Write Message request format

Request

SOF

Request

_flags

Fast Write

Message

IC Mfg

code

UID(1)

MSGLength

Message Data

CRC16

Request

EOF

8 bits

CAh

02h

64 bits

1 byte

(MsgLenght + 1) bytes

16 bits

1. Gray color means that the field is optional.

Table 191. Fast Write Message response format when Error_flag is NOT set

Response SOF

Response_flags

CRC16

Response EOF

8 bits

16 bits

Table 192. Fast Write Message response format when Error_flag is set

Response SOF

Response_flags

CRC16

Response EOF

8 bits

16 bits

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