LRI64 datasheet(35/52 Pages) STMICROELECTRONICS

35 / 52 page

LRI64

Command codes

35/52

Figure 29.

READ Single Block frame exchange between VCD and LRI64

18.4

Write Single Block

When receiving the Write Single Block command, the LRI64 writes the requested block with

the data contained in the request and report the success of the operation in the response.

The Option_Flag is not supported and must be set to 0. The Write Single Block can be

issued in both addressed and non addressed modes.

During the write cycle tW, no modulation shall occur, otherwise the LRI64 may program the

data incorrectly in the memory.

The request frame (Figure 30) contains:

●

Request flags (Table 3 and Table 4)

●

Write Single Block command code (21h, Table 9)

●

Unique ID (Optional)

●

Block number

●

Data

●

2-byte CRC (Figure 15)

If there is no error, at the LRI64, an empty response frame (Figure 31) is sent back after the

write cycle, containing no parameters. It just contains:

●

Response flags (Table 6)

●

2-byte CRC (Figure 15)

Otherwise, if there is an error, the response frame (Figure 32) contains:

●

Response flags (01h, Table 6)

●

Error Code (0Fh, Table 7)

●

2-byte CRC (Figure 15)

Figure 30.

Write Single Block, request frame format

Figure 31.

Write Single Block, response frame format, when Error_Flag is not set

AI06832B

VCD

VICC

SOF

Read Single

Block Request

EOF

SOF

Read Single

Block Response

EOF

AI09735

Request

SOF

Request

Flags

Command

Code

UID

2-Byte

CRC

Request

EOF

8 bits

21h

64 bits

16 bits

Block

Number

8 bits

Data

8 bits

AI09736

Response

SOF

Response

Flags

2-Byte

CRC

Response

EOF

8 bits

16 bits

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