ST25DV04KC datasheet(97/203 Pages) STMICROELECTRONICS

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7.6.13

Extended Read Multiple Blocks

When receiving the Extended Read multiple block command, the ST25DVxxKC 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. Extended Read

Multiple Blocks command can cross areas borders, and returns all blocks until reaching a non readable block

(block read protected or out of memory). 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 ST25DV16KC and ST25DV64KC can be addressed

using this command.

Table 132. 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 133. 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 130)

•

N blocks of data

Table 134. Block security status

Reserved for future use.

All at 0

0: Current block not locked

1: Current block locked

Table 135. Extended Read Multiple Block response format when Error_flag is set

Response SOF

Response_flags

Error code

CRC16

Response EOF

8 bits

16 bits

ST25DV04KC ST25DV16KC ST25DV64KC

RF commands

DS13519 - Rev 3

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