Re: [f-cpu] x86-64 long article

[<nico@seul.org>]

Yann Guidon <whygee@f-cpu.org> a écrit :

> hi !
> 
> (maybe we can go to the francomoule's tribune ?)
> 
> Michael Riepe wrote:
> 
> >On Fri, Jan 24, 2003 at 01:01:27AM +0100, Yann Guidon wrote:
> >[...]
> >  
> >
> >>>Sounds like the return of the G-chip...
> >>>
> >>was it ever away ?
> >>    
> >>
> >Haven't heard from it for a long time...
> >  
> >
> i don't like to speak about things that drive people crazy :-)
> 

:) If you want more than 8 fcpu in a single machine use multicore chip ! :)

> >>Or somebody found the way to multiply the number of pins
> >>without exploding the F-Chip's cost ?...
> >>    
> >>
> >I still prefer high-speed serial links.
> >
> we can't access this technology, or the die's price climbs.
> 

???? N'importe quoi ! (Irgenwas ?)

The lvds link run ar 600 Mhz/pin. 1Ghz will be soon reach. 10 Ghz is plan. We can use this for connecting F-cpu like Athlon 64 does (no big and fat routing chip that cost a lot and add latency like a northbridge in PC chipset).

But technology like hypertransport could be cheaper because you could reuse a lot of test material and module done for it. "Standard" is always cheaper.

> > Something that's compatible
> >with one of the existing serial "buses" would be even better. But...
> >  
> >
> yep, you named it.
> eing compatible with Intel and other has some risks ....
> 

The foundry will have to pay the licence but it could be cheaper that create all new design for such bus.

> 
> >>>Too bad that 8b/10b encoding and other good stuff are patented.
> >>>
> >>Well, i have thought for a long time about an oversampled synchronous 
> >>communication path.
> >>But the maths behind it are too tough for me :-(
> >>    
> >>
> >Hmm... what exactly do you have in mind? Dump your brain to my
> >standard input, please :)
> >
> But not in public.
> It's an old idea (3 or 4 years ?)
> but i want to be the first to find the solution ;-)
> 

You want to create digital modulation put in a wire ? LVDS + data driven transfert (the clock came from  the sender and not from a global clock so you could manage the jitter) do a pretty well job at 1 Ghz ! And it don't need modulation/demodulation module to be used.

nicO

> YG
> 
> 
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