ST25DV64K datasheet(142/220 Pages) STMICROELECTRONICS

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RF operations

ST25DV04K ST25DV16K ST25DV64K

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DocID027603 Rev 4

7.6.25

Extended Get Multiple Block Security Status

When receiving the Extended Get Multiple Block Security Status command, the ST25DVxxx

sends back the security status for each address block: 0 when the block is writable else 1

when block is locked for writing. The block security statuses are defined by the area security

status. The blocks are numbered from 00h up to the maximum memory block number in the

request, and the value is minus one (–1) in the field. For example, a value of '06' in the

“Number of blocks” field requests to return the security status of seven blocks.

This command does not respond an error if number of blocks overlap areas or overlap the

end of the user memory.

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

ST25DV64K-xx can be addressed using this command.

The Option_flag is not supported. The Inventory_flag must be set to 0.

Request parameter:

•

Request flags

•

UID (optional)

•

First block number

•

Number of blocks

Figure 53. Get Multiple Block Security Status frame exchange between VCD

and ST25DVxxx

VCD

SOF

Get Multiple Block

Security Request

status

EOF

ST25DVxxx

<-t1-> SOF

Get Multiple Block

Security

Response status

EOF

Table 140. Extended Get Multiple Block Security Status request format

Request

SOF

Request

_flags

Extended Get

Multiple Block

Security Status

UID(1)

1. Gray color means that the field is optional.

First block

number

Number

of blocks

CRC16

Request

EOF

-8 bits

3Ch

64 bits

16 bits

Table 141. Extended Get Multiple Block Security Status response format

when Error_flags NOT set

Response

SOF

Response_flags

Block security status

CRC16

Response

EOF

8 bits

8 bits(1)

1. Repeated as needed.

16 bits

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