ST25DV64K datasheet(126/220 Pages) STMICROELECTRONICS

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RF operations

ST25DV04K ST25DV16K ST25DV64K

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DocID027603 Rev 4

7.6.15

Extended Write Multiple Blocks

On receiving the Extended Write multiple block command, the ST25DVxxx writes the data

contained in the request to the targeted blocks and reports whether the write operation were

successful in the response. ST25DVxxx supports up to 4 blocks, data field must be coherent

with number of blocks to program.

If some blocks overlaps areas, or overlap end of user memory the ST25DVxxx returns an

error code and none of the blocks are programmed.

When the Option_flag is set, wait for EOF to respond. 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 + m × 302 μs < 20 ms (m is an integer function of Nb number of blocks to be

programmed).

The inventory_flag must be set to 0.

Block number is coded on 2 Bytes so all memory blocks of ST25DV16K-xx and

ST25DV64K-xx can be addressed using this command.

Request parameters:

•

Request flags

•

UID (optional)

•

First block number

•

Number of block

•

Data (from first to last blocks, from LSB bytes to MSB bytes)

Response parameter:

•

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

Table 99. Extended Write Multiple Block request format

Request

SOF

Request_flags

Extended

Write

multiple

block

UID(1)

First

Block

number

Number

block(2)

Data

CRC16

Request

EOF

8 bits

34h

64 bits

16 bits

Block

length(3)

16 bits

1. Gray color means that the field is optional.

2. The number of blocks in the request is one less than the number of blocks that the VICC shall write.

3. Repeated as needed

Table 100. Extended Write Multiple Block response format when Error_flag is NOT set

Response SOF

Response_flags

CRC16

Response EOF

8 bits

16 bits

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