ATA559001-DBW Atmel, ATA559001-DBW Datasheet - Page 49

• 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

7.4
7.4.1
4817C–RFID–03/07
Robustness of the Link
Command CRC
The robustness of the link depends on the likelihood of detecting an error. Therefore, the link is
based on several mechanisms to control the robustness level.
The command frame contains
The expected CRC is the inverted value of
x
Reset and start value is 2h
The remainder is 2h.
2
• The forward symbol definition is based on a pulse interval encoding (PIE) concept to define
• After the header has defined the boundaries of the symbol lengths, the reader transmits a
• At the end of long commands in the forward data stream, a 16-bit CRC follows. The length of
• After becoming synchronous to the reader, the tag backscatters the received and decoded
• The return link supports different types of coding mechanism to avoid interpretation mistakes
• The return link also supports a 16-bit CRC frame. The length can be shortened or extended
• Each anticollision or group-selection procedure is ended by a 16-bit CRC field. The length of
• During the forward header, after the tag is synchronous, the tag transmits internal status
• During the return link header, ATA5590 also transports status and timing information to the
• Additionally, ATA5590 checks the position of EOF symbols and the number of symbols
• 6 command bits and 2 CRC bits, if it is a default command
• 4 command bits, 2 modulation control bits, plus 2 CRC bits
+ x
“0”, “1”, and EOF symbols. The boundary for detection is controlled by the reader. The timing
and the timing differences between the symbols are defined by the header, which allows
flexible, and therefore user-controlled, robustness.
command frame which contains the 6-bit command and 2-bit CRC.
this CRC frame can be shortened or extended by the reader to increase robustness, or, if the
reader is able to interpret the backscattered stream directly, to shorten messages.
bits of the forward stream back to the reader. This enables the possibility of controlling the
link on the fly, and, if the reader detects an error, it can close this command directly to avoid
misunderstanding, or to shorten the communication time.
by the reader. FM0, NRZI, and 3phase1 coding techniques are supported.
by the reader.
this CRC frame, as well as the direction (reader-to-tag or tag-to-reader), is controlled by the
reader.
information back to the reader.
reader, enabling adaptive optimization of the link.
transmitted by the reader.
1
+ 1
ATA5590
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