Date: Sat, 15 Jan 2005 13:13:58 -0800 (PST)
From: John Musielewicz <[EMAIL PROTECTED]>
Subject: Re: USB [Was: Re: [LIB] slow]
--- Philip Nienhuis <[EMAIL PROTECTED]> wrote:
> Date: Fri, 14 Jan 2005 23:24:42 +0100
> From: Philip Nienhuis <[EMAIL PROTECTED]>
> Subject: Re: USB [Was: Re: [LIB] slow]
>
> john wrote:
> > On Wed, 12 Jan 2005, Philip Nienhuis wrote:
> > > john wrote:
> > >> On Sun, 9 Jan 2005, Philip Nienhuis wrote:
> > >>> john wrote:
> > > ..<snip>
> > >>>> On Sat, 8 Jan 2005, Philip Nienhuis wrote:
> > >>>>> john wrote:
> > >>>>>> On Thu, 6 Jan 2005, Philip Nienhuis wrote:
> ..<snip>
> > >>>>>>> I got no USB on my Lib (no EPR, no USB
> card either).
> > >>>>>>
> > >>>>>> On both the 100 and 110 1.1 usb is native.
> you just need to plug in a
> > >>>>>> connector to the docking port plug.
> > >>>>>
> > >>>>> I got no docking station, just the port
> replicator :-(
> > >>>>>
> > >>>> you don't need the dock. if you check the 100
> maintence manual it shows
> > >>>> the pinout for the usb. you just need to
> connect to those four pins and
> > >>>> you have it.
> > >
> > > Found it, pins 91-94 (Table C-2), i.e. USBVC1
> (2X), USBDP1, USBDN.
> > > Right but.....
> >
> > just need a plug really and to turn the controller
> on.
>
> Ah.
> Problem: I'm not so much the HW/engineering type.
> How can one turn the
> controller on?
>
this is specific to the controller. I haven't looked
at this one so don't know but do know in this kind of
situation it can be done with all controllers.
> ..<snip>
> > >> The usb support is in the I/O ? GA. It isn't
> supported under Windows from
> > >> what I've seen neither 2000 or XP sees it. The
> linux alternative driver
> > >> does uhbc I think its called. There isn't the
> buffering drivers--for a
> > >> hotswappable setup you would need to install
> those (being able to plug and
> > >> unplug the cable with poweron) but its there.
> > >
> > > Any suggestion for adding these drivers in? It
> would be interesting to
> > > add a USB port to the small port replicator
> ("I/O Adapter") if at all
> > > possible....
> > >
> > they are just buffering chips. they keep the
> voltage stableon the
> > controller and allow you to disconnect the cable.
> connect the d i/o to it
> > and the the socket for the cable on the other
> side.
>
> What chips and where might I try to get them?
> I've googled around a bit but I could find only
> complete USB host
> controller chips.
places that sell digital logic like mouser or digikey.
just search there in the catalog for 'buffer ic'.
>
> > > I wonder if there is some sort of HW handshaking
> needed to initialize
> > > USB; if so, the chips in the EPR might take care
> of this and w/o an EPR
> > > USB simply won't work.
> > >
> >
> > raymond was right -- without the dock the usb is
> turned off. easy to turn
> > back on though if you think about it.
>
> Any advice for mere mortals on how to do this?
>
don't really know at this point.
> (Perhaps just a simple capacitor+resistor for
> holding some line up or
> down for a while will do the trick.... probably not
> even one of the USB
> lines but some other (dedicated?) line, because it
> will signal to switch
> on additional PCMCIA slots, USB and maybe other
> stuff too? Or maybe some
> connector pins are simply connected in the EPR but
> not in the small port
> replicator? I've looked in the pin assignment
> overview in the ref manual
> but I can't make much of it apart from the very
> obvious.)
that's basically how its done if it needs a stable
voltage somethings it neds a pulse or pulses.
>
> AFAICS, what is needed are some sort of I/O
> electrical buffers
> (hopefully in one chip), a (mini) USB connector and
that's all they come in is one chip.
> a way to switch the
> USB on in the "IO & PC-Card Controller GA" - If the
> electr(on)ical stuff
> is OK but the OS still can't see it not much is
> gained.
switching it on in hardware is best otherwise you need
a software driver.
john
>
> In addition I wonder how much current/power the USB
> lines can deliver.
> Vcc+ might have to be borrowed from somewhere else
> on the connector.
>
> Philip
>
>
>
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