XRA00 Datasheet, PDF (32/40 Pages) STMicroelectronics – UHF, EPCglobal, Contactless Memory IC 96 bit ePC with Inventory and Kill Function

XRA00
Lock Function
The Lock function is implemented by programming
a specific value into the lock bits of the XRA00, us-
ing the ProgramID command. In order to lock the
XRA00, the 8 upper bits of the row 7 must be pro-
grammed with the value A5h, as shown in Table
14. and Table 15.
If a value different from A5h is programmed in the
8 upper bits of the row 7, the tag in NOT LOCKED,
and the XRA00 will return this value in response to
any ScrollID, ScrollAllID or Verify command.
Table 14. Row 7 of an Unlocked or Erased Memory
Row 7 _{bit8bit 1}
Lock Bit
bit8bit1
Kill Code
bit 127 126 125 124 123 122 121 120 119 118 117 116 115 114 113 112
Value 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
Table 15. Row 7 of a Locked Memory (Showing Lock Code A5h)
Row 7 _{bit8bit 1}
Lock Bit
bit8bit1
Kill Code
bit 127 126 125 124 123 122 121 120 119 118 117 116 115 114 113 112
Value 1 0 1 0 0 1 0 1 0 0 0 0 0 0 0 0
EraseID and ProgramID Timing
The time required to erase or program a XRA00 is
t_erase and t_pgm, respectively. See Table 4., XRA00
Backscattered Answer Modulation Parameters for
values.
The Reader to XRA00 Request Frame is much like
the Basic Command frame. The differences be-
tween the two are listed below:
■ The Programmer must send 0's after the
[EOF] for the duration of the program or erase
time, t_pgm or t_erase.
■ The ProgramID and EraseID operations are
terminated by a "1" at the end of t_erase or t_pgm.
■ The Programmer must transmit seven 0's after
the terminating "1" to allow the XRA00 to
perform an orderly shutdown of the erase/
program sequence.
■ Transmission of subsequent programming
commands must be preceded by an XRA00
carrier off interval of at least 8 x t₀.
Figure 34. EraseID and ProgramID Signaling
Prior sequence
transaction gap
or carrier off
64µs
Spin up
20 0's
000000000000000000000 1
16 data bits
Variable Data
Power Off Interval
Between Rows
= 8t0 minimun
EOF
t0
terase or tpgm _10000000
S
P
P
P
O Command 1 Pointer 2 Length 3
Value
PP E
45 O
0's
F
always 16
F
variable
number
of bits
7 0's
P
3
variable number of bits
PP E
45 O
F
ProgramID, EraseID Commands
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