SRI512_08 datasheet(35/47 Pages) STMICROELECTRONICS

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SRI512

SRI512 commands

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8.7

Read_block(Addr) command

Command code = 08h

On receiving the Read_block command, the SRI512 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 16 blocks of the SRI512 (addresses 0 to 15).

Read_block commands issued with a block address above 15 will not be interpreted and the

SRI512 will not return any response, except for the System area located at address 255.

The SRI512 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 SRI512 before a Select() command is issued are ignored.

Figure 41.

Read_block request format

Request parameter:

●

Address: block addresses from 0 to 15, 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 SRI512

SOF

Read_block

CRCL

CRCH

EOF

AI07684b

08h

8 bIts

8 bits

Address

SOF

Data 1

CRCL

CRCH

EOF

AI07685b

8 bits

Data 2

Data 3

Data 4

8 bIts

SOF Data 1

AI10948b

Data 2 Data 3 Data 4

Reader

SRI512

CRCL CRCH EOF

<-t0-> <-t1->

SOF

08h

CRCL CRCH EOF

ADDR

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