SRI4K datasheet(33/45 Pages) STMICROELECTRONICS

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SRI4K

SRI4K commands

33/45

8.7

Read_block(Addr) command

Command code = 08h

On receiving the Read_block command, the SRI4K 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 SRI4K (addresses 0 to 127).

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

the SRI4K will not return any response, except for the System area located at address 255.

The SRI4K 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 SRI4K 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 SRI4K

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 1

AI10890c

Data 2 Data 3 Data 4

Reader

SRI4K

CRCL CRCH

<-t0-><-t1->

08h

CRCL CRCH

Address

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