From: faculaganymede (faculaganymede++at++yahoo.com)
Date: 10/26/2005 09:32:30
Hi Stace,
Thanks so much for following up on this question, we
appreciate it very much!!
--- Stace Peterson <stacep++at++sgi.com> wrote:
> Hi,
>
> I asked around, and found someone who could give a
> little bit of
> information. His response:
>
> > The two pipes are genlocked. We want to know the
> time lag
> > between the outputs of the master pipe and the
> slave
> > via the DDO2 DVP channels, down to the order of
> > nano-seconds.
>
> If you want to know this sort of thing within
> nano-seconds, it will of
> course depend on the length of the wires as well as
> the impedence of
> those same wires. The simple rule is about 8 inches
> per nano-second,
> and there is some additional delay in the
> electronics on the second
> pipe.
>
> So, I guess I'm saying that noone can give you a
> theoretical answer that
> is of much use. To find the actual delay, your best
> bet is to connect
> the sync signals to a two channel oscope and measure
> it.
>
> There are also variations in components between one
> DG5 board and
> another, so if you simply go measure this on an
> oscope, you might well
> need to recalibrate it if you ever have to replace a
> DG5 board.
>
> Hope this helps,
> Stace
>
> faculaganymede wrote:
> >
> > Hi Stace,
> >
> > Thank you for your reply.
> >
> > Our Performer application is running on a SGI Onyx
> > 300, InfiniteReality 3, with 2 graphics pipes.
> The
> > two pipes are genlocked. We want to know the time
> lag
> > between the outputs of the master pipe and the
> slave
> > via the DDO2 DVP channels, down to the order of
> > nano-seconds. Our Performer application runs at a
> > frame rate of 200 Hz, 12-bit RGB image depth. Do
> you
> > have any info on this, or can point us to someone
> at
> > SGI who may know?
> >
> > --- Stace Peterson <stacep++at++sgi.com> wrote:
> >
> > > Hi,
> > >
> > > The short answer is no, typically there should
> not
> > > be a lag time between
> > > pipes. The long answer is, it depends upon your
> > > hardware setup and
> > > application. With the correct hardware, an
> > > application can synchronize
> > > the swap behavior of multiple pipes. Are you
> not
> > > seeing synchronization
> > > of pipes? If so, what is the application (just
> > > perfly?) and hardware
> > > setup?
> > >
> > > Thanks,
> > > Stace
> > >
> > > faculaganymede wrote:
> > > >
> > > > Performer gurus,
> > > >
> > > > When using two pipes in a Performer
> application,
> > > is
> > > > there a time lag between the outputs of the
> two
> > > > graphics pipes?
> > > >
> > > > Thanks,
> > > > faculaganymede
> > > >
> > > >
> > > >
> > > > __________________________________
> > > > Yahoo! Mail - PC Magazine Editors' Choice 2005
> > > > http://mail.yahoo.com
> > > >
> > > >
> > >
> >
>
-----------------------------------------------------------------------
> > > > List Archives, Info, FAQ:
> > > http://www.sgi.com/software/performer/
> > > > Open Development Project:
> > > http://oss.sgi.com/projects/performer/
> > > > Submissions:
> > > info-performer++at++sgi.com
> > > > Admin. requests:
> > > info-performer-request++at++sgi.com
> > > >
> > >
> >
>
-----------------------------------------------------------------------
> > >
> > > --
> > >
> >
>
------------------------------------------------------------------
> > > Stace Peterson
> > > stacep++at++sgi.com
> > > Silicon Graphics, Inc.
> > > (650) 933-2323
> > >
> >
> > Thanks,
> > faculaganymede
> >
> >
> > __________________________________
> > Yahoo! Music Unlimited
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>
> --
>
------------------------------------------------------------------
> Stace Peterson
> stacep++at++sgi.com
> Silicon Graphics, Inc.
> (650) 933-2323
>
Thanks,
faculaganymede
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