ST25DV64K datasheet(124/197 Pages) STMICROELECTRONICS

124 / 197 page

Figure 65. Present Password frame exchange between VCD and ST25DVxxx

SOF

Present

Password

request

VCD

ST25DVxxx

EOF

SOF

Present

Password

response

EOF

7.6.37

Fast Read Single Block

On receiving the Fast Read Single Block command, the ST25DVxxx reads the requested block and sends back

its 32-bit value in the response. 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 213. Fast Read Single Block request format

Request SOF Request_flags Fast Read Single Block IC Mfg code UID (1) Block number CRC16 Request EOF

8 bits

C0h

02h

64 bits 8 bits

16 bits

1. This field is optional.

Request parameters:

•

Request flags

•

UID (optional)

•

Block number

Table 214. Fast Read Single Block response format when Error_flag is NOT set

Response SOF

Response_flags

Block security status (1)

Data

CRC16

Response EOF

8 bits

32 bits

16 bits

1. This field is optional.

Response parameters:

•

Block security status if Option_flag is set (see Table 215. Block security status)

•

Four bytes of block data

Table 215. Block security status

Reserved for future use

All at 0

0: Current Block not locked

1: Current Block locked

ST25DV04K ST25DV16K ST25DV64K

RF commands

DS10925 - Rev 11

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