On Monday 06 February 2006 3:21 am, Mukund JB. wrote:

> So, The USB 1.1 Devices which are unaware of SRP & HNP cannot
> communicate with OTG HOSTs. Is this right or wrong?

Wrong.  It just means they're not OTG devices.  If the OTG host
isn't powering VBUS at all times -- why would it? -- then you'd
rely on the fact that it's powered at least briefly after the
ID pin gets grounded by the Mini-A connector.  So the end-user
scenario would be to connect the Mini-B end of the cable (or
the B-end plus a Mini-A adapter), then hook the Mini-A end up,
and all would act as usual.

Assuming of course that the relevant USB 1.1 peripheral is in the
target peripheral list of that OTG host.  There are lots of
reasons it might not be in that list ... maybe the OTG device's
firmware is incompatible in some way, or that USB 1.1 peripheral
needs more VBUS power than is available.




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