SRI2K datasheet(33/45 Pages) STMICROELECTRONICS

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SRI2K

SRI2K commands

Doc ID 15779 Rev 3

33/45

8.7

Read_block(Addr) command

Command code = 08h

On receiving the Read_block command, the SRI2K 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 64 blocks of the SRI2K (addresses 0 to 63).

Read_block commands issued with a block address from 64 to 127 will generate a non-

significative answer. Read_block commands issued with a block address above 127 will not

be interpreted and the SRI2K will not return any response, except for the System area

located at address 255.

The SRI2K 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 SRI2K before a Select() command is issued are ignored.

Figure 41.

Read_block request format

Request parameter:

●

Address: block addresses from 0 to 63, 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 SRI2K

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

DATA

ai15587

DATA

Reader

SRI2K

CRCL CRCH

<-t0-><-t1->

08h

CRCL CRCH

ADDR

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