sri4k STMicroelectronics, sri4k Datasheet - Page 31

• Manufacturer Part Number: sri4k
• Description: 13.56 Mhz Short-range Contactless Memory Chip With 4096-bit Eeprom And Anticollision Functions
• Manufacturer: STMicroelectronics

SRI4K
8.4
SELECT(Chip_ID) command
Command Code = 0Eh
The SELECT() command allows the SRI4K to enter the SELECTED state. Until this
command is issued, the SRI4K will not accept any other command, except for INITIATE(),
PCALL16() and SLOT_MARKER(). The SELECT() command returns the 8 bits of the
Chip_ID value. An SRI4K in SELECTED state, that receives a SELECT() command with a
Chip_ID that does not match its own is automatically switched to DESELECTED state.
Figure 32. SELECT request format
Request parameter:
Figure 33. SELECT response format
Response parameters:
Figure 34. SELECT frame exchange between Reader and SRI4K
Reader
SRI4K
–
–
SOF
8-bit Chip_ID stored during the anticollision sequence
Chip_ID of the selected tag. Must be equal to the transmitted Chip_ID
SOF
SOF
0Eh
SELECT
0Eh
Chip_ID
Chip_ID
8 bits
CRC L
Chip_ID
8 bits
CRC H EOF
8 bits
CRC L
<-t 0 -><-t 1 ->
8 bits
CRC L
SOF Chip_ID
CRC H
8 bits
CRC H
8 bits
CRC L CRC H EOF
SRI4K commands
EOF
AI07671
EOF
AI07677
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