SRIX4K datasheet(36/50 Pages) STMICROELECTRONICS

36 / 50 page

SRIX4K commands

SRIX4K

36/50

9.8

WRITE_BLOCK (Addr, Data) command

Command Code = 09h

On receiving the WRITE_BLOCK command, the SRIX4K 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 SRIX4K (addresses 0 to 127).

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

and the SRIX4K 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 SRIX4K. The

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

The SRIX4K 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 SRIX4K 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

AI07687

8 bits

DATA 2

DATA 3

DATA 4

8 bIts

WRITE_BLOCK

ADDRESS

09h

8 bIts

AI07680

No Response

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