SRT512 datasheet(34/46 Pages) STMICROELECTRONICS

34 / 46 page

SRT512 commands

SRT512

34/46

Doc ID 13277 Rev 4

8.7

Read_block(Addr) command

Command code = 08h

On receiving the Read_block command, the SRT512 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 SRT512 (addresses 0 to 15).

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

SRT512 will not return any response, except for the System area located at address 255.

The SRT512 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 SRT512 before a Select() command is issued are ignored.

Figure 40.

Read_block request format

Request parameter:

●

Address: block addresses from 0 to 15, or 255

Figure 41.

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 42.

Read_block frame exchange between reader and SRT512

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

AI13513c

Data 2Data 3 Data 4

Reader

SRT512

CRCL CRCH EOF

<-t0-> <-t1->

SOF 08h

CRCL CRCH EOF

Address

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