[sdiy] uC with mul

[jbv]

Jim Patchell :

>      Actually, a 128K rom (27c010) is actaully about the smallest rom
> you can actually buy new these days, although, even at $5.00 each,  plus
> the two latches, you are right that this will probably add enough cost
> to justify a fancier micro...I sort of wish this option was availiable
> to me about 15 years ago when I needed a high speed multiplier in a
> project that used a 6502.  For that one, I built a multiplier using
> 74F384 serial multiplier chips and ran it at like 40mhz.  The look up
> rom would have been easier, but parts that big were not availiable at
> the time, or if they were, would have been very expensive.
>

Funny you mentioned this : I had exactly the same problem in the mid-80's
and ended up with the same solution...



mikko.a.helin at nokia.com :

> Also there might be some external hardware multipliers that could be used
> with any uC.

Actually, this is the solution I'm about to choose. I need a very fast
multiplier
and a DSP-based solution is too complicated for what I want to do.
Beforehand, I just wanted to know if there were any fast uC with some
built-in
mul, and as I was too busy (or lazy) to browse all manufacturers datasheets,
I simply asked the list.
BTW thanks to all members who replied.

As for the project I'm working on, I really don't know if I'll ever find the
time
to complete it, but I'll keep you posted...
It deals with voltage-controlled granular synthesis and voltage controlled
additive synthesis... Again, a DSP seems the better choice, but working with
hardware mul + RAM + ROM allows to implement some sort of parallel
processing and pipe-line structure, somewhat easier than with DSPs (at least
for a humble DIYer)...

Best,
JB