sri512 STMicroelectronics, sri512 Datasheet - Page 35

• Manufacturer Part Number: sri512
• Description: 13.56-mhz Short-range Contactless Memory Chip With 512-bit Eeprom And Anti-collision Functions
• Manufacturer: STMicroelectronics

SRI512
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:
Figure 42. READ_BLOCK response format
Response parameters:
Figure 43. READ_BLOCK frame exchange between Reader and SRI512
Reader
SRI512
SOF
ADDRESS: block addresses from 0 to 15, or 255
DATA 1: Less significant data Byte
DATA 2: Data Byte
DATA 3: Data Byte
DATA 4: Most significant data Byte
SOF
SOF
08h
DATA 1
8 bIts
READ_BLOCK
ADDR
08h
CRC L CRC H EOF
DATA 2
8 bIts
ADDRESS
8 bIts
DATA 3
8 bIts
<-t 0 -> <-t 1 ->
8 bits
DATA 4
SOF DATA
CRC L
8 bIts
1
DATA
2
CRC L
8 bits
CRC H
DATA
8 bits
3
DATA
SRI512 commands
4
CRC H
8 bIts
CRC L CRC H EOF
EOF
AI07684
AI10948
EOF
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