ST25DV04K datasheet(94/200 Pages) STMICROELECTRONICS

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7.6.13

Extended Read Multiple Blocks

When receiving the Extended 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 last block

of memory 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 2047 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 2 Bytes so all memory blocks of ST25DV16K-xx and ST25DV64K-xx can be addressed

using this command.

Table 129. Extended Read Multiple Block request format

Request

SOF

Request_flags

Extended

Read

Multiple

Block

UID (1)

First block

number

Number of

blocks

CRC16

Request

EOF

8 bits

33h

64 bits

16 bits

1. This field is optional.

Request parameters:

•

Request flags

•

UID (optional)

•

First block number (from LSB byte to MSB byte)

•

Number of blocks (from LSB byte to MSB byte)

Table 130. Extended Read Multiple Block response format when Error_flag is NOT set

Response SOF

Response_

flags

Block security

status (1)

Data

CRC16

Response EOF

8 bits

8 bits (2)

32 bits (2)

16 bits

1. This field is optional.

2. Repeated as needed.

Response parameters:

•

Block security status if Option_flag is set (see Table 131. Block security status)

•

N blocks of data

Table 131. Block security status

Reserved for future use.

All at 0

0: Current block not locked

1: Current block locked

Table 132. Extended Read Multiple Block response format when Error_flag is set

Response SOF

Response_flags

Error code

CRC16

Response EOF

8 bits

16 bits

Response parameter:

ST25DV04K ST25DV16K ST25DV64K

RF commands

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