XRA00 datasheet(30/40 Pages) STMICROELECTRONICS

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XRA00

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Figure 32. Example of a Quiet Request Frame Signaling

Talk

XRA00 devices that match the data sent by the

Reader return to the Awake state, where they will

respond to commands from the Reader.

XRA00 devices inactivated by the Quiet command

can be reactivated by the Talk command.

The Talk command follows the same rules as the

Quiet, PingID and ScrollID commands for the se-

lection of the XRA00 devices. An individual XRA00

or a group of XRA00 devices can be brought out of

the Asleep state, as required.

Example Talk Command. A Reader issues a

Talk command containing the following data:

[CMD] =

00110010b

(Talk)

[PTR] =

00000111b

(0x07)

[LEN] =

00001001b

(0x09)

[VALUE] = 000101101b

(0x2D)

The XRA00 devices will attempt to check 9 bits of

their address data, starting from bit 7, against the

data specified in the [VALUE] field. The XRA00

devices with matching data revert from the Asleep

to the Awake state thus becoming responsive to all

subsequent Reader commands until a new Quiet

command is received.

The XRA00 devices do not return any response to

the Talk command.

In the example illustrated in Table 12., the under-

lined XRA00 memory bits are compared with the

[VALUE] data sent by the Reader.

After issuing the Talk command the Reader must

transmit seven 0’s after the EOF for the XRA00 to

execute the Talk Command. Once the seven 0’s

have been sent, the Reader must immediately is-

sue a transaction gap.

Table 12. Example of a Talk Operation

Figure 33. Example of aTalk Request Frame Signaling

ai10771

Transaction Gap

Transaction

Quiet, Talk

Commands

7t0

EOF

XRA00 ID Code/Bit Position

XRA00 executes the Talk command and enters the

Awake state

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

...101100000001011011110111b

YES

ai10771

Transaction Gap

Transaction

Quiet, Talk

Commands

7t0

EOF

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