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Message
From: Ravi Kumar Krishnan<ravikk@h...>
Date: Wed Jan 12 06:14:39 CET 2005
Subject: [usb] VBUS state in HNP
Hi Xianshic,Hnp can be initiated by B Device.
but the HNP is enabled by A Device with a control Transaction.
After getting enabled the B Device will have capability for becoming HOST.
The Drive Vbus is always driven by A_Device only.
It can drive Drvbus when A device become peripheral.
Regards
Ravikumar Krishnan
-----Original Message-----
From: xianshic [mailto:xianshic@y...]
Sent: Tuesday, January 11, 2005 5:14 PM
To: usb@o...
Subject: [usb] VBUS state in HNP
Dear All,
When a device starts HNP, did it drive vbus all the
time? Did it still drive VBUS to supply power even
after its role transfer from a_host to a_peripheral?
If the description has misunderstanding, please refer
to attach file.
Thanks lot!
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