From: Julian Wright (julianwr_at_paradise.net.nz)
Date: Mon May 03 2004 - 08:56:31 PDT
Chuck England III wrote:
>I was looking through some of Apples docs and some docs on the Intel
> website for the SA-110 processor, The information indicates that
> there is a 4 line matrix that controls the Core clock frequency.
>In the Newton, they have two of those lines already set and a
> surface mount resistor at either of the other two lines sets
> the core clock at either 100 or 160 MHZ. From what I was reading
> other combinations could produce speeds up to 233Mhz
>
>
You're quite right about the intention of these lines. I looked into it
a while ago, and the real problem is that while the interface for the
SA110 was well defined right from the start, it wasn't always fully
implemented. Specifically there have been several different revisions of
the SA110, some of which don't support higher clock multipliers than the
one that produces 160MHz. This seems to be the variation used in
MP2x00s. What you will need to do is remove your SA110 and replace it
with a later revision, which supports speeds up to 287MHz or more.
Though it has to be noted that even if you find the correct revision of
SA110, that particular chip itself may not be capable of operating
reliably at top speed. It may be necessary to experiment with slightly
lower than maximum multipliers to get a reliable result. You should be
able to get better than 233MHz though. But for most people, replacing
the SA110 may be the insurmountable stumbling block.
Somebody please feel free to prove me wrong about the revision of SA110
in the Newt!
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