LRI512 datasheet(30/54 Pages) STMICROELECTRONICS

30 / 54 page

LRI512

30/54

READ SINGLE BLOCK

Command Code = 0x20

When receiving the Read Single Block Command,

the LRI512 read the requested block and send

back its 32 bits value in the Response.The

Option_Flag is supported.

Request parameter (Table 24):

– Option_Flag

– UID (Optional)

– Block Number

Response parameter (Table 25):

– Block Locking Status if Option_Flag is set

– 4 bytes of Block Data

Response parameter (Table 27):

– Error Code as Error_Flag is set

Table 24. Read Single Block Request Format

Table 25. Read Single Block Response Format when Error_Flag is NOT Set

Table 26.

Table 27. Read Single Block Response Format when Error_Flag is Set

Figure 34. READ Single Block Frame Exchange between VCD and LRI512

Request

SOF

Request

Flags

Read Single

Block

UID

Block

Number

CRC16

Request

EOF

8 bits

0x20

64 bits

8 bits

16 bits

Response

SOF

Response

Flags

Block

Locking

Status

Data

CRC16

Response

EOF

8 bits

32 bits

16 bits

b7 (bit b0 for ISO)

0: Current Block not locked

1: Current Block locked

Reserved for future used. All at 0

Response SOF

Response_Flags

Error Code

CRC16

Response EOF

8 bits

16 bits

AI06832

VCD

LRI512

SOF

Read Single

Block Request

EOF

SOF

Read Single

Block Response

EOF

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