LRI2K datasheet(65/89 Pages) STMICROELECTRONICS

65 / 89 page

LRI2K

Commands codes

65/89

20.16

Write Kill

On receiving the Write Kill command, the LRI2K writes 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. After a successful write, the kill code must be locked by a Lock Kill

command to activate the protection.

During the write cycle tW, there should be no modulation (neither 100% nor 10%).

Otherwise, the LRI2K may not correctly program the data to the memory. The tW time is

equal to t1nom + 18 × 302 µs.

Request parameters:

●

UID (Optional)

●

Kill Address (00h = Kill, other = Error)

●

Data

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

Response parameter:

●

Error code as Error_flag is set:

–

10h: block address not available

–

12h: block is locked

–

13h: block not programmed

Table 66.

Write Kill request format

Request

SOF

Request_

flags

Write

Kill

IC Mfg

code

UID

Kill

access

Kill code

CRC16

Request

EOF

8 bits

B1h

02h

64 bits

00h

32 bits

16 bits

Table 67.

Write Kill response format when Error_flag is NOT set

Response SOF

Response_flags

CRC16

Response EOF

8 bits

16 bits

Table 68.

Write Kill response format when Error_flag is set

Response SOF

Response_flags

Error code

CRC16

Response EOF

8 bits

16 bits

Figure 55.

Write Kill frame exchange between VCD and LRI2K

VCD

SOF

Write Kill

request

EOF

LRI2K

<-t1-> SOF

Write Kill

response

EOF

Write sequence when

error

LRI2K

<------------ tW ------------><- t1 -> SOF

Write Kill

response

EOF

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