ATA559001-DBW Atmel, ATA559001-DBW Datasheet - Page 93

• Manufacturer Part Number: ATA559001-DBW
• Description: RF Wireless Misc UHF (1kbit r/w anti- collis. Ni-Au)
• Manufacturer: Atmel

Specifications of ATA559001-DBW

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

13.7.8
13.7.9
Figure 13-6. Structure and Addressing Mechanism Supported by Anticollision_pointer_random Command
4817C–RFID–03/07
Group_p_leeq and Group_p_greq
Anticollision_pointer_random
Header
Command
Figure 13-5. Structure and Addressing Mechanism Supported by Group_pointer and
These group-selection commands are pointer-based. The structure is the same as before
(Group_pointer commands). The difference is that the compare algorithm during arbitration is
expanded to less than or equal to (leeq), and greater than or equal to (greq).
Leeq: set pre_select flag (status1) if EEPROM forward stream
Greq: set pre_select flag (status1) if EEPROM
The 8-bit command code is:
Addressing possibilities for the whole memory cannot guarantee unique data structures for
arbitration.
Anticollision_pointer_random command supports non-unique data structures because the arbi-
tration field contains an 8-bit random value.
The 8-bit command code is 55h, which includes the 2-bit CRC.
The structure of the parameter and address field is the same as for the anticollision_pointer
command.
Note:
• 5B, including the 2-bit CRC for Group_p_leeq
• 5C, including the 2-bit CRC for Group_p_greq
Parameter
Header
Page
It is also possible to arbitrate only over the random value or a part of it.
Command
Block
Anticollision_pointer Commands
Address
Bit
Parameter
Page
EOT
8-bit randomly generated value
Block
Header
Address
Bit
Random
EOT
Start address of EEPROM access
Start address of arbitration
Arbitration
EEPROM content
Header
forward stream
Arbitration field
EOF
CRC
EOF
EOT
ATA5590
CRC
EOT
93