SRIX4K datasheet(35/50 Pages) STMICROELECTRONICS

35 / 50 page

SRIX4K

SRIX4K commands

35/50

9.7

READ_BLOCK(Addr) command

Command Code = 08h

On receiving the READ_BLOCK command, the SRIX4K reads the desired block and returns

the 4 data Bytes contained in the block. 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).

READ_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 SRIX4K must have received a SELECT() command and be switched to SELECTED

state before any READ_BLOCK() command can be accepted. All READ_BLOCK()

commands sent to the SRIX4K before a SELECT() command is issued are ignored.

Figure 41.

READ_BLOCK request format

Request parameter:

–

ADDRESS: block addresses from 0 to 127, or 255

Figure 42.

READ_BLOCK response format

Response parameters:

–

DATA 1: Less significant data Byte

–

DATA 2: Data Byte

–

DATA 3: Data Byte

–

DATA 4: Most significant data Byte

Figure 43.

READ_BLOCK frame exchange between Reader and SRIX4K

SOF

READ_BLOCK

CRCL

CRCH

EOF

AI07684

08h

8 bIts

8 bits

ADDRESS

SOF

DATA 1

CRCL

CRCH

EOF

AI07685

8 bits

DATA 2

DATA 3

DATA 4

8 bIts

DATA

AI07686b

DATA

Reader

SRIX4K

CRCL CRCH

<-t0-><-t1->

08h

CRCL CRCH

ADDR

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