Have a closer look at:
http://www.intel.com/design/strong/SA_110doc.htm
especially to the reference manual.
It sounds very promising!
And if the Strong Arm runs with external overclocking, why it should not run
using the internal PLL setting ???
Johannes
> -----Original Message-----
> From: newtontalk-bounce_at_newtontalk.net
> [mailto:newtontalk-bounce_at_newtontalk.net]On Behalf Of Marco Mailand
> Sent: Tuesday, July 09, 2002 4:07 PM
> To: newtontalk_at_newtontalk.net
> Subject: Re: [NTLK] New accelerator idea. needs no crystal. Need Help.
>
>
>
> > >The upshot of that was that it could easily be arrange but he asked the
> > >question why didn't I just change the multiplier? Why? because I didn't
> > >know there was one :-).
> That there is some sort of multiplication is clear after reading the web
> pages of Stephanie. She replaced the 3.686 MHz x-tal with a 5 MHz type to
> get the higher speed and reported a factor of nearly 44 (unusual, hmm, but
> possible). I did very similar work and synthesized a 500MHz
> signal out of a
> 16.666MHz carrier, using a PLL.
>
> > >The great advantage is that, if my hunch is right, only the core of the
> > >chip will run fast. The Voyager and therefor the serial coms
> etc will run
> > >at normal speed. The memory timing will remain unchanged. There is a
> > >question mark of sound (chipmunk or not) but apart from that I
> recon the
> > >Newt won't need to be switched to the normal frequency again.
> If the chip was designed by Apple I would assume that they did it right a
> made only the core frequency changable by these pins. If it is a standard
> PLL circuit it can be anything and we simply lack the schematics.
>
> > >Now I can try trying the pins controlling the multiplier high
> or low as I
> > >wish. switch settings and check the results.
> ...
> > >It doesn't work!! I can change the levels on the multiplier pins but it
> > >doesn't seem to work properly.
> Based on my experiences with the PLL thing I would assume that the
> multiplier ratio is read in only upon power-up of the IC or needs an
> additional external trigger signal at another pin. Against this
> speaks that
> you observed the unit hanging if you change a switch. The latter could be
> triggered if e.g. the ratio would exceed the capabilities of the
> Strong Arm
> core, as e.g. more than 250MHz could be such a limit. I don't know how
> exactly you know the meaning of the pins but switching the 2 to
> the power 6
> pin means a factor of 64 which would lead to 236MHz and maybe
> already exceed
> the capabilities of the processor.
> --
> With best regards / Viele Gruesse
>
> Marco Mailand
> http://slsbd.psi.ch/timing
> http://slsbd.psi.ch/~mmailand
> https://www.paypal.com/refer/pal=YYD3VUXUVD2YG
>
>
>
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