XRA00 datasheet(29/40 Pages) STMICROELECTRONICS

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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

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] =

00000010b

(Quiet)

[PTR] =

00000111b

(x07)

[LEN] =

00001001b

(0x09)

[VALUE] = 000101101b

(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

Bin 5

(101)

Bin 6

(110)

ai10770

Setup

EOF from CMD

BIN pulses

Bin 1

(001)

Bin 2

(010)

Bin 3

(011)

Bin 4

(100)

Bin 0

(000)

Bin 7

(111)

XRA00 ID Code/Bit Position

XRA00 execute Quiet command

and become inactive

Towards Highest Address Bit

Lowest Address Bit

Bit Number

...321098765432109876543210

XRA00 1 ID

...010001000001011011101010b

YES

XRA00 2 ID

...100111100001001010010010b

NO (bit 10 does not match)

XRA00 3 ID

...101101010001011011110110b

YES

XRA00 4 ID

...101100000001011011111011b

YES

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