xra00 STMicroelectronics, xra00 Datasheet - Page 12

• Manufacturer Part Number: xra00
• Description: Uhf, Epcglobal Class 1b, Contactless Memory Chip 96 Bit Epc With Inventory And Kill Function
• Manufacturer: STMicroelectronics

XRA00
Coast Interval
In order for the XRA00 to be able to detect the next
Transaction Gap, the Reader must start the next
transaction within t
Figure 15. Coast Interval
Ping Reply Bin Collapse
The Reader may optionally shorten the Ping trans-
action time by shortening the Bin response win-
dow. The Reader may listen to a XRA00 reply
during the Bin response window for a minimum
time of 4t
standard BIN response window time. If no XRA00
response is detected, the Reader can generate
the next BIN pulse. This condition may be applied
to each of the 8 BIN intervals if the Reader detects
no reply from a XRA00. The middle Bin response
Figure 16. Collapsed Ping Response
12/40
End of prior sequence
transaction gap or carrier on
0
(= t
tagscrollDell
coast
Bin Response Window
t fwhmBinRW = 8 x t 0
t fwhmBin = 3/8 t 0
(see
Bin Pulse
Tag answer
max), which is half the
Figure
EOF
15.). This re-
Window = 4 x t 0
No Tag answer
Collapsed Bin
Response
Tag Response Windows
striction does not apply when the carrier has been
turned off long enough (at least for t
power to be removed from the XRA00 as the
XRA00 will re-synchronize at the next power-up.
window shown in
due to no XRA00 reply.
A Bin response window may not be collapsed
(shortened) if an answer from the XRA00 is detect-
ed. If the Reader collapses an occupied Bin inter-
val, the reply from the occupying XRA00 may
overlap the collapsed Bin response window and
continue into the next one. The Reader may de-
code the overlapping reply as a collision in the
next Bin response window and will have to solve
the case.
Bin Response Window
t fwhmBinRW = 8 x t 0
t Coast
Tag answer
ScrollID
PingID
Figure 16.
Bin Response Window
Transaction gap
Next sequence
has been shortened
Reset
) for DC
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