ST25DV64K datasheet(153/220 Pages) STMICROELECTRONICS

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ST25DV04K ST25DV16K ST25DV64K

RF operations

219

Request parameters:

•

Request flag

•

UID (Optional)

•

Pointer (start at 00h)

•

Number of bytes is one less then the requested data

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

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..

Table 166. Read Message request format

Request

SOF

Request_

flags

Read

Message

IC Mfg

code

UID(1)

1. Gray color means that the field is optional.

MBpointer

Number

of Bytes

CRC16

Request

EOF

8 bits

ACh

02h

64 bits

8 bits

16 bits

Table 167. 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)

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

16 bits

Figure 62. Read Message frame exchange between VCD and ST25DVxxx

VCD

SOF

Read Message

request

EOF

ST25DVxxx

<-t1-> SOF

Read Message

response

EOF

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