ST25DV04K datasheet(122/200 Pages) STMICROELECTRONICS

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•

Pointer (start at 00h)

•

Number of bytes is one less then the requested data

Table 204. Read Message response format when Error_flag is NOT set

Response SOF

Response_flags

Mailbox content

CRC16

Response EOF

8 bits

(Number of bytes + 1) bytes (1)

16 bits

1. Number of message Bytes when Number of Bytes is set to 00h.

Response parameters:

•

(number of data + 1 ) data bytes

Response parameter:

•

Error code as Error_flag is set:

–

02h: command not recognized

–

03h: command option not supported

–

0Fh: error with no information given

Figure 62. Read Message frame exchange between VCD and ST25DVxxx

SOF

Read Message

request

VCD

ST25DVxxx

EOF

SOF

Read Message

response

EOF

7.6.34

Fast Read Message

On receiving the Fast Read Message command, the ST25DVxxx reads up to 256 byte in the Mailbox from the

location specified by MBpointer and sends back their value in the response. First MailBox location is '00’. When

Number of bytes is set to 00h and MBPointer is equals to 00h, the MB_LEN bytes of the full message are

returned. Otherwise, Fast Read Message command returns (Number of Bytes + 1) bytes (i.e. 01h returns 2 bytes,

FFh returns 256 bytes).

An error is reported if (Pointer + Nb of bytes + 1) is greater than the message length..

RF Reading of the last byte of mailbox message automatically clears b1 of MB_CTRL_Dyn “HOST_PUT_MSG”

and allows RF to put a new message.

The data rate of the response is multiplied by 2 compated to Read Message.

The subcarrier_flag should be set to 0, otherwise the ST25DVxxx answers with an error code. The Option_flag is

not supported, and the Inventory_flag must be set to 0.

Table 205. Fast Read Message request format

Request

SOF

Request_flags

Fast Read

Message

IC Mfg

code

UID(1) MBpointer

Number of

Bytes

CRC16

Request

EOF

8 bits

CCh

02h

64 bits

8 bits

16 bits

1. This field is optional

Request parameters:

•

Request flag

ST25DV04K ST25DV16K ST25DV64K

RF commands

DS10925 - Rev 9

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