[Open-graphics] decoding video in real-time

[Attila Kinali]

Salut,

On Mon, 16 Apr 2007 17:26:15 +0200
"Nicolas Boulay" <nicolas.boulay at gmail.com> wrote:

> I miss this one :)

With my Mount Everest like backlog of OGP mails,
this doesn't matter at all.

 
> 2007/3/24, Attila Kinali <attila at kinali.ch>:
> > On Sun, 18 Mar 2007 21:04:49 +0100
> > "Nicolas Boulay" <nicolas.boulay at gmail.com> wrote:
> > > I just speak about the fact that 4 Ghz logic is not impossible.
> > > Because 6 Ghz (or 130 ps of propagation time) still exist. Usualy the
> > > problem are in the clock propagation time, but globaly asynchronous
> > > design could work at that speed.
> >
> > Yes. But the industry still refrains from using any asynchron
> > design. Even GALS are only used in research, though they should
> > be quite straight forward to use.
> > (Ok, multiple cores are some very coars grained form of GALS,
> > but well...)
>
> Globaly asynchronous/localy synchronous are a design technic where
> each module use a standard synchonous logic, but connection between
> each block are asynchrone. This permit different clock speed and avoid
> all the nighmarre of having a clock at 1ns periode with 20ns of delay
> depending where you read the clock inside the clock tree. The bigger
> the design the worst the problem is.

Yes.
 
> Most (all?) SoC design are done like this.

I don't know. The SoC design i've seen a few years back were
all synchronus to make the interconnect network simpler. But
that might have changed by now. But GALS are still a research
subject and AFAIK know not that well understood. I'm also not
so sure how many SoC are really used out there in the industry.
I have not seen any myself yet, but that doesn't mean anything at all.

> So i didn't speak about asynchronous logic at all.

Sorry, i missunderstood you.

BTW: Please do not top post.

			Attila Kinali

-- 
Praised are the Fountains of Shelieth, the silver harp of the waters,
But blest in my name forever this stream that stanched my thirst!
                         -- Deed of Morred