XRA00 datasheet(26/40 Pages) STMICROELECTRONICS

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XRA00

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ScrollAllID Answer Frame Description

XRA00 devices that respond to a ScrollAllID com-

mand reply by modulating an eight bit preamble

(7Fh) followed by a 16-bit CRC and the entire

XRA00 96-bit ePC code. The XRA00 devices start

by modulating the lowest memory address data bit

onward up to the highest memory address data bit.

The XRA00 ScrollAllID Answer Frame structure is

given in Figure 28. The 16-bit CRC data contained

in the ScrollAllID Answer Frame is calculated ac-

cordingly and stored into the XRA00 memory dur-

ing the XRA00 programming process.

Figure 28. ScrollAllID Answer Frame Structure

Kill

The Kill command is a Basic command that gives

rise to an invalid response from the XRA00 to the

ePC Reader queries.

XRA00 devices whose data starting at the location

specified by the [PTR] field (must be cleared to ‘0’)

matches the entire [VALUE] field sent by the

Reader (that is, the 16-bit CRC, 96-bit ePC code

and an 8-bit Kill Code) are erased and do not pro-

vide valid ePC data to the Reader.

Data in the [VALUE] field is compared to XRA00

memory, from the lowest to the highest XRA00

memory address. XRA00 devices whose data do

not match or that fail a parity test on any of the par-

ity bits enter the Persistence mode.

■

Killing a XRA00 can be done whether the

XRA00 is locked or not, assuming that the

correct Kill Code is issued during the

instruction

■

The Kill Code can be 00h

The time required to Kill a XRA00 is tKill (see Table

4., XRA00 Backscattered Answer Modulation Pa-

rameters for timings). It is anticipated that the Kill

command will require higher field strengths from

the Reader, and will therefore be a short-range op-

eration.

The Reader to XRA00 Request Frame for a Kill

command is similar to the Request Frame for a

EraseID or ProgramID command.

11111110

ai10767

1110111111000001 110110000011011000101010000011101...10000011001011101001100111110000111100011101

Preamble

(8 bits)

CRC Data

(16 bits)

Tag ID Code

(96 bits)

XRA00 address 00h

XRA00 address 6Fh

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