SRI4K-SBN181GE STMICROELECTRONICS [STMicroelectronics], SRI4K-SBN181GE Datasheet - Page 33

• Manufacturer Part Number: SRI4K-SBN181GE
• Description: 13.56 MHz short-range contactless memory chip with 4096-bit EEPROM and anticollision functions
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

SRI4K
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:
●
Figure 42. Read_block response format
Response parameters:
●
●
●
●
Figure 43. Read_block frame exchange between reader and SRI4K
Reader
SRI4K
SOF
Address: block addresses from 0 to 127, or 255
Data 1: Less significant data byte
Data 2: Data byte
Data 3: Data byte
Data 4: Most significant data byte
SOF
S
O
F
Data 1
08h
8 bIts
Read_block
Address
08h
Data 2
CRC L CRC H
8 bIts
Address
8 bIts
E
O
F
Data 3
8 bIts
<-t 0 -><-t 1 ->
S
O
F
8 bIts
8 bits
Data 4
CRC L
Data 1
Data 2 Data 3 Data 4
CRC L
8 bits
CRC H
8 bits
SRI4K commands
CRC H
8 bIts
CRC L CRC H
EOF
EOF
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