Interfaces
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The Interface number (and it's Alternate) are shown in the top left
corner of the Interface box (0.0 in this case).
If the device supports Full speed data transfer, this is indicated
by a red double arrow in the interface. If possible !USBInfo
will try to show a useful sprite of the connected devices and
show a suitable name for it.
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Multiple interfaces
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If a device contains more than one interface, and the additional
interfaces are not shown, a small bullet will be shown to the left
of the interface box. Click the bullet to reveal the extra interfaces.
Multiple interfaces are generally used by devices that support multiple
features that can be used simultaneously. A good example of such a
device is the Logitech keyboard and mouse combination.
The Interface number (and the Alternate number) is shown in the top
left of the Interface box. In this case Interfaces 0 and 1 are present.
Interface 0 is the keyboard and Interface 1 is the Mouse.
Both interfaces have an Interrupt in endpoint with a maximum
packet size of 8 bytes and can generate an interrupt every 10 ms.
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Alternate interfaces
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For each Interface present in a Device, there may be Alternates.
If an Alternate interface is present (and currently not displayed)
a small purple diamond will be shown to the left of the Interface
box. Click the diamond to reveal any Alternate interfaces.
The Interface and Alternate number will be shown in the top left
of the Interface box. In this example there are three alternates
for the printer device. Only one Alternate can be used at any one
time. It's up to the driver software to select an appropriate
alternate.
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Further information
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© Copyright Paul Reuvers
X-Ample Technology bv
usb@xat.nl
Last changed: Last changed: Wednesday, 23 July 2003 - 00:25 CET.
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