LRI2K datasheet(64/89 Pages) STMICROELECTRONICS

64 / 89 page

Commands codes

LRI2K

64/89

20.15

Kill

On receiving the Kill command, in the Addressed mode only, the LRI2K compares the kill

code with the data contained in the request and reports whether the operation was

successful in the response. The Option_Flag is supported. If the command is received in the

Non Addressed or the Selected mode, the LRI2K returns an error response.

During the comparison cycle equal to tW, there should be no modulation (neither 100% nor

10%). Otherwise, the LRI2K may not match the kill code correctly. The tW time is equal to

t1nom + 18 × 302µs. After a successful Kill command, the LRI2K is deactivated and does not

interpret any other command.

Request parameters:

●

UID (Optional)

●

Kill Code

Response parameter:

●

No parameter. The response is send back after the writing cycle

Response parameter:

●

Error code as Error_Flag is set:

–

0Fh: other error

–

14h: block not locked

Table 63.

Kill request format

Request

SOF

Request_

Flags

Kill

IC Mfg

code

UID

Kill

access

Kill code

CRC16

Request

EOF

8 bits

A6h

02h

64 bits

00h

32 bits

16 bits

Table 64.

Kill response format when Error_Flag is NOT set

Response SOF

Response_Flags

CRC16

Response EOF

8 bits

16 bits

Table 65.

Kill response format when Error_Flag is set

Response SOF

Response_Flags

Error code

CRC16

Response EOF

8 bits

16 bits

Figure 54.

Kill frame exchange between VCD and LRI2K

VCD

SOF Kill request EOF

LRI2K

<-t1->

SOF

Kill response

EOF

Kill sequence when

error

LRI2K

<------------ tW ------------><- t1 -> SOF Kill response EOF

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