----- Original Message -----
From: Fred Finster <[EMAIL PROTECTED]>
To: Dag Brattli <[EMAIL PROTECTED]>; <[EMAIL PROTECTED]>
Cc: <[EMAIL PROTECTED]>; <[EMAIL PROTECTED]>
Sent: Thursday, September 09, 1999 7:22 PM
Subject: RE: Vr4121 FIR driver info FROM NEC Electronics
> > Robert Coie <[EMAIL PROTECTED]> writes:
> >
> > > I am working on an FIR driver for the Vr4121 (which, of course, if
> > > ever becomes functional, will be contributed), and have some areas of
> > > confusion:
> >
> > Do you know the name of the IrDA controller unit and transceiver. For
FIR
> > you usually need to know the details of both. I guess the Vr4121 is some
> > sort of super-IO that includes the IrDA controller chip, right?
> >
> > > The FIR and SIU are separate devices, and can both be used at the same
> > > time provided they are not both trying to use the IrDA tranceiever.
> > > In other words, if the SIU is using the RS232 pins, then the IrDA
> > > tranceiver is free for use by the FIR unit.
>
> Yes FIR and SIU are separate pins. A16 IRDOUT, B14 IRDIN, B15 FIRDIN#
/SEL
> But you cannot use both at the Same time. See SIUIRSEL register
0xAC000008
> bit D0, page 564 Chapter 25 in the Vr4121 Manual. This sets the SIU's
> communication format (IrDA or Serial). One or the other, not both at the
> same time.
All that says to me is that the SIU unit can only talk over RS-232 or IrDA.
That doesn't mean that the SIU can't be talking over RS-232, while the FIR
is talking over the IrDA.
SIUIRSEL is more about the IrDA module settings than the SIU settings. Of
course both the SIU unit and the FIR can't talk over the IrDA at the same
time. That's what IRUSESEL bit is for, right?
The way I read the docs, it seems like the SIU can talk over RS-232 while
the FIR unit talks over IrDA at the same time.
Regards,
Brad
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