ST25DV04K datasheet(131/200 Pages) STMICROELECTRONICS

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7.6.40

Fast Extended Read Multiple Block

On receiving the Fast 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 up to the 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 to 2047 assuming

that they are all located in the same area. If the number of blocks overlaps several areas or overlaps the end of

user memory, the ST25DVxxx returns an error code.

When the Option_flag is set, the response includes the Block Security Status. The data rate of the response is

multiplied by 2.

The subcarrier_flag should be set to 0, otherwise the ST25DVxxx answers with an error code.

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 225. Fast Extended Read Multiple Block request format

Request

SOF

Request_flags

Fast Extended

Read Multiple

Block

IC Mfg

code

UID (1)

First block

number

Block

Number

CRC16

Request

EOF

8 bits

C5h

02h

64 bits 16 bits

16 bits

1. This field is optional.

Request parameters:

•

Request flag

•

UID (Optional)

•

First block number (from LSB byte to MSB byte)

•

Number of blocks (from LSB byte to MSB byte)

Table 226. Fast 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 223. Block security status if Option_flag is set)

•

N block of data

Table 227. Block security status if Option_flag is set

Reserved for future

use All at 0

0: Current not locked

1: Current locked

Table 228. Fast Read Multiple Block response format when Error_flag is set

Response SOF

Response_flags

Error code

CRC16

Response EOF

8 bits

16 bits

ST25DV04K ST25DV16K ST25DV64K

RF commands

DS10925 - Rev 9

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