Pyneo
Wolfgang Spraul
wolfgang at sharism.cc
Wed Feb 17 15:36:01 EST 2010
Ron,
> Ben uses Xburst 4720
> 4720 supports USB 1.1 host
Correct.
> Ben only supports USB 1.1 Device
The 'support' comes in different levels:
1. on the chip (silicon) die
2. wired out from the chip
3. wired out from the chip into and onto the PCB
4. hooked up to an actual physical connector
None of the higher levels are possible if the lower levels are not there.
But, a feature may exist on the silicon die, but not wired out from the chip
package. Or it may be wired out from the chip, but not connected to anything
on the PCB.
For the Ben NanoNote, #1 and #2 are true, but #3 and #4 are not.
For Ya (or rather the AVT2 experimental boards towards Ya), we have also done
#3 and #4.
No Ingenic CPU currently supports USB On-The-Go, which would allow us to do
proper UBS host and client with only one connector. Last I heard the new 4760
should support OTG. I will follow-up on that.
Hope this helps, please keep asking if anything is unclear.
Wolfgang
On Wed, Feb 17, 2010 at 09:22:48PM -0800, Ron K. Jeffries wrote:
> Wolfgang,
>
> I am confused.
>
> Ben uses Xburst 4720
> 4720 supports USB 1.1 host
>
> but.... (drum roll please)
>
> Ben only supports USB 1.1 Device
>
> What am I missing?
>
> Is supporting USB Host on next Nanonote
> primarily a software issue?
>
> Or is it how the port is wired, with Ben not having
> the necessary extra traces, or maybe Ben
> uses the "wrong" (for host mode) physical USB connector?
>
> Thanks in advance for your patience answering possibly dumb questions. I am
> (obviously) not an engineer.
>
> ---
> Ron K. Jeffries
>
> On Wed, Feb 17, 2010 at 10:53, Wolfgang Spraul <wolfgang at sharism.cc> wrote:
>
> > Ron,
> >
> > > I assume it is OK to ask how USB host is implemented on
> > > the AVT2, since the Xburst does not support host mode.
> >
> > 4720 (as in the Ben NanoNote) has a USB host controller (1.1 though), same
> > as 4740.
> > 4725 does not, neither do any other QFP variants from Ingenic.
> > They decided that QFP should be differentiated by not having USB host
> > (it's on the die, but not wired out). They regret this decision now but
> > that's how it was made.
> >
> > Wolfgang
> >
> >
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