ST25TV02K datasheet(39/90 Pages) STMICROELECTRONICS

39 / 90 page

Figure 13. Lock single block frame exchange between VCD and ST25TV02K/512

SOF

Lock block

request

VCD

EOF

ST25TV02K/512

SOF

Lock block

response

EOF

SOF

Lock block

response

EOF

ST25TV02K/512

Lock sequence

when error

6.4.9

Read Multiple Blocks

When receiving the Read Multiple Block command, the ST25TV02K/512 read the selected blocks and sends back

their value in multiples of 32 bits in the response. The blocks are numbered from 00h to 3Fh 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. When the Option_flag is set, the response returns the Block Security Status.

When a read multiple starts in an area with read access authorized and finishes in an area without read access

authorized, only the data available in the area with read access authorized is returned. When a read access starts

in an area with no read access authorized, an error is returned.

Block number is coded on 1 Byte.

Table 55. Read Multiple Block request format

Request SOF Request_flags

Read Multiple

Block

UID (1)

First block

number

Number of blocks CRC16 Request EOF

8 bits

23h

64 bits 8 bits

8 bits

16 bits

1. The field is optional.

Request parameters:

•

Request flags

•

UID (optional)

•

First block number

•

Number of blocks

Table 56. 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. The field is optional.

2. Repeated as needed.

Response parameters:

•

Block security status if Option_flag is set (see Table 57. Block security status)

•

N blocks of data

ST25TV02K ST25TV512

RF commands

DS12074 - Rev 11

page 39/90

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