LRI1K datasheet(73/86 Pages) STMICROELECTRONICS

73 / 86 page

LRI1K

Commands codes

Doc ID 17170 Rev 3

73/86

20.21

Fast Read Multiple Block

When receiving the Fast Read Multiple Block command, the LRI1K reads the selected

blocks and sends back their value in multiples of 32 bits in the response. The blocks are

numbered from '00h’ to '1Fh' in the request.

The “Number of blocks” value corresponds to the number of blocks to be read after the first

block. For example, if the “number of blocks” field contains the value 06h, 7 blocks will be

read. The maximum number of blocks that can be read is 32.

During Sequential Block Read, when the block address reaches 32, it rolls over to 0. The

Option_flag is supported. The data rate of the response is multiplied by 2.

Request parameters:

●

Option_flag

●

UID (Optional)

●

First block number

●

Number of blocks

Response parameters:

●

Block Locking Status if Option_flag is set

●

N block of data

Table 80.

Fast Read Multiple Block request format

Request

SOF

Request_

flags

Fast

Read

Multiple

Block

IC Mfg

code

UID

First

block

number

Number

blocks

CRC16

Request

EOF

8 bits

C3h

02h

64 bits

8 bits

16 bits

Table 81.

Fast Read Multiple Block response format when Error_flag is NOT set

Response

SOF

Response_

flags

Block Locking

Status

Data

CRC16

Response

EOF

8 bits

8 bits(1)

Repeated as needed.

32 bits(1)

16 bits

Table 82.

Block Locking status if Option_flag is set

All 0

0: Current block not locked

1: Current block locked

Table 83.

Fast Read Multiple Block response format when Error_flag is set

Response SOF

Response_flags

Error code

CRC16

Response EOF

8 bits

16 bits

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