ST25DV64K datasheet(162/220 Pages) STMICROELECTRONICS

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RF operations

ST25DV04K ST25DV16K ST25DV64K

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DocID027603 Rev 4

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.

Request parameters:

•

Request flag

•

UID (Optional)

•

First block number

•

Number of blocks

Figure 68. Fast Read Multiple Block frame exchange

between VCD and ST25DVxxx

VCD

SOF

Fast Read

Multiple Block

request

EOF

ST25DVxxx

<-t1-> SOF

Fast Read

Multiple Block

response

EOF

Table 186. Fast Extended Read Multiple Block request format

Request

SOF

Request_

flags

Fast

Extended

Read Multiple

Block

IC Mfg

code

UID(1)

1. Gray color means that the field is optional.

First

block

number

Block

Number

CRC16

Request

EOF

-8 bits

C5h

02h

64 bits

16 bits

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