ATA559001-DBW Atmel, ATA559001-DBW Datasheet - Page 23

• 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

4.6
4.7
4817C–RFID–03/07
Use of the Random Number Generator
Default Frames of the Return Link Stream
ATA5590 supports several commands where the execution or the return link contents is based
on random effects. Therefore, a random number generator is implemented on the ATA5590
chip.
Random effects are used
Therefore, ATA5590 supports non-unique data structures for each arbitration procedure.
The return link is built by
During the synchronous return link, it is possible to operate in a loop mode which increases the
SNR for the whole communication. There is no need for new command sequences.
Synchronous operation mode enables some adaptive mechanisms such as quasi-continuous bit
rates or adaptive CRC.
Figure 4-5.
During programming the return link contains a silent time, during which the reader does not send
any messages to the tag. During this time the reader sends a continuous wave (CW). The length
of the silent time depends on the field strength of the received RF signal.
For all other commands, the silent time is zero.
The length of the data frame depends on the command and the reader. The reader is able to
close the return link by transmitting an EOT frame.
If the reader wants to increase the robustness of the link, the reader may restart the message by
sending a new header instead of the EOT frame.
• To calculate a 5-bit slot number and/or an 8-bit random value, which is backscattered during
• To calculate a 4-bit slot number for the answering mechanism triggered by the wake-up
• To calculate an 8-bit random value for the deterministic arbitration, if required
• A return link header to get reference symbols, adjust modulation timing, adjust timing
• A data frame which can be based (depending on the command) on
• A 16-bit CRC frame (the bit count can be adjusted by the reader, if required)
• An EOT frame
the Aloha-based arbitration
commands
windows for anticollision, and set the EOF timing
– The 8-bit status2 register
– The 8-bit random value (arbitration commands)
– The 16-bit slot information (wake-up commands)
– The contents of the EEPROM (n bits)
Forward
EOT
Return Link Frame
Silent
Header
Data
16 bits
CRC
ATA5590
EOT
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