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?
..<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.
> > 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?
(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.)
AFAICS, what is needed are some sort of I/O electrical buffers
(hopefully in one chip), a (mini) USB connector and 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.
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
