ST25DV64K datasheet(117/220 Pages) STMICROELECTRONICS

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ST25DV04K ST25DV16K ST25DV64K

RF operations

219

7.6.9

Extended Write Single Block

On receiving the Extended Write Single command, the ST25DVxxx writes the data

contained in the request to the targeted block and reports whether the write operation was

successful in the response. When the Option_flag is set, wait for EOF to respond.

The Inventory_flag must be set to 0.

During the RF write cycle Wt, there should be no modulation (neither 100% nor 10%),

otherwise the ST25DVxxx may not program correctly the data into the memory. The Wt time

is equal to t1nom + N × 302 µs (N is an integer).

Block number is coded on 1 Byte and only first 256 blocks of ST25DV16K-xx and

ST25DV64K-xx can be addressed using this command.

Request parameters:

•

Request flags

•

UID (optional)

•

Block number

•

Data

Response parameter:

•

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

Figure 37. Write Single Block frame exchange between VCD and ST25DVxxx

VCD

SOF

Write Single

Block request

EOF

ST25DVxxx

<-t1-> SOF

Write Single

Block response

EOF

Write sequence when

error

ST25DVxxx

<------------------- Wt ---------------> SOF

Write Single

Block response

EOF

Table 79. Extended Write Single request format

Request

SOF

Request_flags

Extended Write

Single Block

UID(1)

1. Gray color means that the field is optional.

Block

number

Data

CRC16

Request

EOF

8 bits

31h

64 bits

16 bits

32 bits

16 bits

Table 80. Extended Write Single response format when Error_flag is NOT set

Response SOF

Response_flags

CRC16

Response EOF

8 bits

16 bits

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