XRA00 datasheet(12/40 Pages) STMICROELECTRONICS

12 / 40 page

XRA00

12/40

Coast Interval

In order for the XRA00 to be able to detect the next

Transaction Gap, the Reader must start the next

transaction within tcoast (see Figure 15.). This re-

striction does not apply when the carrier has been

turned off long enough (at least for tReset) for DC

power to be removed from the XRA00 as the

XRA00 will re-synchronize at the next power-up.

Figure 15. Coast Interval

Ping Reply Bin Collapse

The Reader may optionally shorten the Ping trans-

action time by shortening the Bin response win-

dow. The Reader may listen to a XRA00 reply

during the Bin response window for a minimum

time of 4t0 (= ttagscrollDell max), which is half the

standard BIN response window time. If no XRA00

response is detected, the Reader can generate

the next BIN pulse. This condition may be applied

to each of the 8 BIN intervals if the Reader detects

no reply from a XRA00. The middle Bin response

window shown in Figure 16. has been shortened

due to no XRA00 reply.

A Bin response window may not be collapsed

(shortened) if an answer from the XRA00 is detect-

ed. If the Reader collapses an occupied Bin inter-

val, the reply from the occupying XRA00 may

overlap the collapsed Bin response window and

continue into the next one. The Reader may de-

code the overlapping reply as a collision in the

next Bin response window and will have to solve

the case.

Figure 16. Collapsed Ping Response

ai10754

tCoast

End of prior sequence

transaction gap or carrier on

EOF

Next sequence

Transaction gap

Tag Response Windows

Bin Response Window

ScrollID

PingID

ai10755

Bin Response Window

tfwhmBinRW = 8 x t0

Collapsed Bin

Response

Window = 4 x t0

Bin Response Window

tfwhmBinRW = 8 x t0

Bin Pulse

tfwhmBin = 3/8 t0

Tag answer

No Tag answer

Tag answer

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