Alcor Micro AU9540 Техническое справочное руководство - Страница 15
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6. USB Selective Suspend Feature
The driver determines whether it should enter selective suspend state by the following
requirements.
1. The card is in power off state or there is no card in the reader.
2. The reader is idle at least for a given time (30 seconds by default). It means during
the period there is no command issuing to reader and there is no card
inserting/removing event occurs.
When the driver detects both the two requirements above are met, it starts processing
the following tasks,
1. Send standard USB command to the reader to enable remote wake function.
2. Start selective-suspend procedure to ask the system to suspend the reader.
After entering the selective suspend state, the driver determines whether it should exit
selective suspend state when one of the following conditions occurs,
1. There is any command which intend to communicate with the reader.
2. When card inserting/removing event occurs, the reader issues resume signal to the
host. Then the system will inform the driver to exit selective suspend state.
AU9540 into the host.
5. When AU9540 is not
inserted into the host
and
the
host
is
suspend
mode.
Plug
AU9540 into the host
with smart card inserted
in advance.
6. When AU9540 is
inserted into the host,
insert a smart card into
AU9540. Then get host
into
suspend
mode.
After that, remove the
smart
card
from
AU9540. Then plug in
the smart card again.
7. When there is no card
inserted into AU9540
and
the
host
is
suspend
mode,
AU9540 into the host.
Then, insert a smart
card into AU9540.
AU9540 USB Smart Card Reader V1.6
Host will be woken up and
detect AU9540. After the host
in
is woken up, AU9540 is ready
to operate card now.
When user removes the card, it
will not wake up the host from
suspend mode. Then insert a
card. It will wake up the host.
After the host is woken up,
AU9540
will
operate the card.
When AU9540 is plugged into
the host without card inserted,
in
the host will not be woken up.
plug
However, if user inserts a card
now, the host will be woken up.
This feature must work with
host
system
remote-wake up.
be
ready
to
that
supports
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