ST25DV64K datasheet(121/220 Pages) STMICROELECTRONICS

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ST25DV04K ST25DV16K ST25DV64K

RF operations

219

7.6.12

Read Multiple Blocks

When receiving the Read Multiple Block command, the ST25DVxxx reads the selected

blocks and sends back their value in multiples of 32 bits in the response. The blocks are

numbered from 00h to FFh in the request and the value is minus one (–1) in the field. For

example, if the “Number of blocks” field contains the value 06h, seven blocks are read. The

maximum number of blocks is fixed at 256 assuming that they are all located in the same

area. If the number of blocks overlaps areas or overlaps the end of user memory, the

ST25DVxxx returns an error code. When the Option_flag is set, the response returns the

Block Security Status.

The Inventory_flag must be set to 0.

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)

•

First block number

•

Number of blocks

Figure 40. Extended Lock block frame exchange between VCD

and ST25DVxxx

VCD

SOF

Extended

Lock

block

request

EOF

ST25DVxxx

<-t1-> SOF

Extended

Lock block

response

EOF

Lock sequence

when error

ST25DVxxx

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

Extended

Lock block

response

EOF

Table 88. Read Multiple Block request format

Request

SOF

Request_

flags

Read Multiple

Block

UID(1)

1. Gray color means that the field is optional.

First block

number

Number

of blocks

CRC16

Request

EOF

-8 bits

23h

64 bits

8 bits

16 bits

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