SRI4K datasheet(34/45 Pages) STMICROELECTRONICS

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SRI4K commands

SRI4K

34/45

8.8

Write_block (Addr, Data) command

Command code = 09h

On receiving the Write_block command, the SRI4K writes the 4 bytes contained in the

command to the addressed block, provided that the block is available and not write-

protected. Data bytes are transmitted with the least significant byte first, and each byte is

transmitted with the least significant bit first.

The address byte gives access to the 128 blocks of the SRI4K (addresses 0 to 127).

Write_block commands issued with a block address above 127 will not be interpreted and

the SRI4K will not return any response, except for the System area located at address 255.

The result of the Write_block command is submitted to the addressed block. See the

following Figures for a complete description of the Write_block command:

●

Figure 12: Resettable OTP area (addresses 0 to 4).

●

Figure 15: Binary counter (addresses 5 to 6).

●

Figure 17: EEPROM (addresses 7 to 127).

The Write_block command does not give rise to a response from the SRI4K. The reader

must check after the programming time, tW, that the data was correctly programmed. The

SRI4K must have received a Select() command and be switched to Selected state before

any Write_block command can be accepted. All Write_block commands sent to the SRI4K

before a Select() command is issued, are ignored.

Figure 44.

Write_block request format

●

Request parameters:

●

Address: block addresses from 0 to 127, or 255

●

Data 1: Less significant data byte

●

Data 2: Data byte

●

Data 3: Data byte

●

Data 4: Most significant data byte.

Figure 45.

Write_block response format

SOF

Data 1

CRCL

CRCH

EOF

AI07687b

8 bits

Data 2

Data 3

Data 4

8 bIts

Write_block

Address

09h

8 bIts

AI07680b

No response

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