XRA00 Datasheet, PDF (25/40 Pages) STMicroelectronics – UHF, EPCglobal, Contactless Memory IC 96 bit ePC with Inventory and Kill Function

XRA00
ScrollID Answer Frame Description
The XRA00 devices that respond to a ScrollID
command reply by modulating an eight bit pream-
ble (11111110) followed by a 16-bit CRC and the
entire XRA00 96-bit ePC code as shown in Figure
27. The XRA00 devices start by modulating from
Figure 27. ScrollID Answer Frame Structure
the lowest to the highest memory address. The
XRA00 ScrollID Answer Frame structure is given
in Figure 27. The 16-bit CRC data contained in the
ScrollID Answer Frame is calculated accordingly
and stored into the XRA00 memory during the
XRA00 programming process.
11111110 1110111111000001 110110000011011000101010000011101...10000011001011101001100111110000111100011101
Preamble
(8 bits)
CRC Data
(16 bits)
Tag ID Code
(96 bits)
XRA00 address 00h
XRA00 address 6Fh
ai10767
ScrollAllID
The ScrollAllID command is a Basic command that
gives rise to a response from the XRA00.
When this command is sent, the [VALUE], [PTR]
and [LEN] fields are ignored by the XRA00. This
command is similar to the ScrollID command de-
scribed above, but for the discrimination.
■ Any unlocked XRA00 seeing the command
will reply by sending back an 8-bit preamble,
16-bit CRC and its entire 96-bit ePC code, as
well as the Kill code and Lock code location
bits.
■ Any locked XRA00 seeing the command will
reply by sending back an 8-bit preamble, 16-
bit CRC and its entire 96-bit ePC code.
The XRA00 devices start by modulating the lowest
memory address bit onward up to the highest
memory address bit.
Example of a ScrollAllID Command. A Reader
issues a command containing the following data:
[CMD] = 00110100_b (ScrollAllID)
[PTR] =
00000111_b (0x07)
[LEN] =
00001001_b (0x09)
[VALUE] = 000101101_b (0x2D)
The XRA00 devices will ignore all the field con-
tents. Even though a data check takes place the
results of the check are ignored and all XRA00s
that receive the ScrollAllID command respond with
a ScrollID Reply.
In Table 9., XRA00 devices 1, 2 and 3 respond to
the command. Underlined bits in XRA00 memory
are compared with the [VALUE] data but the result
is not used.
Table 9. Example of a ScrollAllID Operation
XRA00 ID Code/Bit Number
Towards Highest
Address Bit
Lowest Address Bit
Bit Number
...321098765432109876543210_b
XRA00 1 ID
...010001000001011011101010_b
XRA00 2 ID
...100111100001001010010010_b
XRA00 3 ID
...101101010001011011110111_b
XRA00 respond to ScrollAllID command
-
YES
YES (even though bit 10 fails to match)
YES
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