LRI2K datasheet(72/89 Pages) STMICROELECTRONICS

72 / 89 page

Commands codes

LRI2K

72/89

20.21

Fast Read Multiple Block

On receiving the Fast Read Multiple Block command, the LRI2K reads the requested blocks

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

from '00’ to '3F' in the request and the value is minus one (–1) in the field. For example, a

value 06h in the “number of blocks” field causes the LRI2K to read 7 blocks. The maximum

number of blocks is fixed at 64. During Sequential Block Read, when the block address

reaches 64, 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

Response parameter:

●

Error code as Error_flag is set:

–

0Fh: other error

–

10h: block address not available

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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