XRA00 datasheet(25/40 Pages) STMICROELECTRONICS

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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

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.

Figure 27. ScrollID Answer Frame Structure

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] =

00110100b

(ScrollAllID)

[PTR] =

00000111b

(0x07)

[LEN] =

00001001b

(0x09)

[VALUE] = 000101101b

(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

11111110

ai10767

1110111111000001 110110000011011000101010000011101...10000011001011101001100111110000111100011101

Preamble

(8 bits)

CRC Data

(16 bits)

Tag ID Code

(96 bits)

XRA00 address 00h

XRA00 address 6Fh

XRA00 ID Code/Bit Number

XRA00 respond to ScrollAllID command

Towards Highest

Address Bit

Lowest Address Bit

Bit Number

...321098765432109876543210b

XRA00 1 ID

...010001000001011011101010b

YES

XRA00 2 ID

...100111100001001010010010b

YES (even though bit 10 fails to match)

XRA00 3 ID

...101101010001011011110111b

YES

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