XRA00 Datasheet, PDF (29/40 Pages) STMicroelectronics – UHF, EPCglobal, Contactless Memory IC 96 bit ePC with Inventory and Kill Function

XRA00
sponse Windows delineated by BIN pulses from
the Reader after a Setup time.
The 3 bits of XRA00 memory that come immedi-
ately after the matched data determine the partic-
ular Bin Response Window for an XRA00 reply.
XRA00 devices where these 3 bits are equal to
'000' respond in the first Bin Response Window,
XRA00 devices where the 3 bits are equal to '001'
reply in the second Bin Response Window...
XRA00 devices where the 3 bits are equal to '111'
respond in the eighth Bin Response Window.
These Bin Response Window are also called
"bins" and numbered from 0 through to 7 as shown
in Figure 31.
As described in the Ping Reply Bin Collapse para-
graph, the Reader may shorten a BIn Response
Window if no tag answer is detected.
Figure 31. PingID Answer Response Period - Reader Modulations Define Response Bins
Setup
Bin 0
(000)
Bin 1
(001)
Bin 2
(010)
Bin 3
(011)
Bin 4 Bin 5
(100) (101)
Bin 6
(110)
Bin 7
(111)
EOF from CMD
BIN pulses
ai10770
Quiet
XRA00 devices that match the data sent by the
Reader enter the Asleep state where they no long-
er respond to Reader commands. They remain in
the Asleep state until they receive the appropriate
Talk command or after the Persistance mode time
limit is exceeded (even if power has been removed
from the XRA00).
Example of a Quiet Command. A Reader is-
sues a Quiet command containing the following
data:
[CMD] = 00000010_b (Quiet)
[PTR] =
00000111_b (x07)
[LEN] =
00001001_b (0x09)
[VALUE] = 000101101_b (0x2D)
XRA00 devices will attempt to check 9 bits of their
address data, starting from bit 7, against the data
specified in the [VALUE] field. XRA00 devices
whose data matches enter the Asleep state and
remain in this state.
Once in the Asleep state the XRA00 devices will
fail to respond to any command until they receive
a Talk command or the Persistence mode limit
time is exceeded.
The XRA00 devices do not return any response to
the Quiet command.
In the example illustrated in Table 11., the under-
lined XRA00 memory bits are compared with the
[VALUE] data sent by the Reader.
After issuing the Quiet command, the Reader must
transmit seven 0’s after the EOF for the XRA00 to
execute the Quiet command. Once the seven 0’s
have been sent, the Reader is allowed to start a
new transaction.
Table 11. Example of a Quiet Operation
XRA00 ID Code/Bit Position
Towards Highest Address Bit
Lowest Address Bit
Bit Number
...321098765432109876543210
XRA00 1 ID
...010001000001011011101010_b
XRA00 2 ID
...100111100001001010010010_b
XRA00 3 ID
...101101010001011011110110_b
XRA00 4 ID
...101100000001011011111011_b
XRA00 execute Quiet command
and become inactive
-
YES
NO (bit 10 does not match)
YES
YES
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