LRI2K datasheet(53/89 Pages) STMICROELECTRONICS

53 / 89 page

LRI2K

Commands codes

53/89

20.6

Read Multiple Block

When receiving the Read Multiple Block command, the LRI2K reads the selected 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, if the

“number of blocks” field contains the value 06h, 7 blocks will be read. 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.

Request parameters:

●

Option_Flag

●

UID (Optional)

●

First Block Number

●

Number of Blocks

Response parameter:

●

Block Locking Status if Option_Flag is set (see Table 36: Block Locking status)

●

N Blocks of Data

Response parameter:

●

Error Code as Error_Flag is set:

–

0Fh: other error

–

10h: block address not available

Table 34.

Read Multiple Block request format

Request

SOF

Request_

Flags

Read

Multiple

Block

UID

First

block

number

Number

blocks

CRC16

Request

EOF

8 bits

23h

64 bits

8 bits

16 bits

Table 35.

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 36.

Block Locking status

All 0

0: Current Block not locked

1: Current Block locked

Table 37.

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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