LRI2K datasheet(51/89 Pages) STMICROELECTRONICS

51 / 89 page

LRI2K

Commands codes

51/89

20.4

Write Single Block

On receiving the Write Single Block Command, the LRI2K writes the data contained in the

request to the requested block and reports whether the write operation was successful in

the response. The Option_flag is supported.

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

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

equal to t1nom + 18 × 302µs.

Request parameters:

●

UID (Optional)

●

Block number

●

Data

Response parameter:

●

No parameter. The response is sent 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 28.

Write Single Block request format

Request

SOF

Request_

flags

Write

Single

Block

UID

Block

number

Data

CRC16

Request

EOF

8 bits

21h

64 bits

8 bits

32 bits

16 bits

Table 29.

Write Single Block response format when Error_flag is NOT set

Response SOF

Response_flags

CRC16

Response EOF

8 bits

16 bits

Table 30.

Write Single Block response format when Error_flag is set

Response SOF

Response_flags

Error code

CRC16

Response EOF

8 bits

16 bits

Figure 43.

Write Single Block frame exchange between VCD and LRI2K

VCD

SOF

Write Single

Block request

EOF

LRI2K

<-t1->

SOF

Write Single

Block response

EOF

Write sequence when error

LRI2K

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

SOF

Write Single

Block response

EOF

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