ST25DV04K datasheet(129/200 Pages) STMICROELECTRONICS

129 / 200 page

Figure 67. Fast Extended Read Single Block frame exchange between VCD and ST25DVxxx

SOF

Fast Extended

Read Single Block

request

VCD

ST25DVxxx

EOF

SOF

Fast Extended

Read Single Block

response

EOF

7.6.39

Fast Read Multiple Blocks

On receiving the Fast Read Multiple Blocks 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 up to the last block of user

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 256 assuming that they

are all located in the same area. If the number of blocks overlaps area 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 1 Byte and only first 256 blocks of ST25DV16K-xx and ST25DV64K-xx can be

addressed using this command.

Table 221. Fast Read Multiple Block request format

Request

SOF

Request_flags

Fast Read

Multiple Block

IC Mfg

code

UID (1)

First block

number

Number of

blocks

CRC16

Request

EOF

8 bits

C3h

02h

64 bits 8 bits

8 bits

16 bits

1. This field is optional.

Request parameters:

•

Request flag

•

UID (Optional)

•

First block number

•

Number of blocks

Table 222. Fast 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

ST25DV04K ST25DV16K ST25DV64K

RF commands

DS10925 - Rev 9

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