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stettbac@isibee5 (Juerg Stettbacher) writes:

>Question: What's a reasonable size for program memory P.
>(Common DSP applications with  monitor for stand alone.
>Software development in C and assembler).
DSP applications in assembler are normally quite short. The NeXT has 8 KB
memory for its DSP, that seems to be enough. The Atari Falcon030, however,
has 32 KB memory. The Falcon's OS supports loading multiple programs in the
DSP memory at the same time, so it makes sense to have more than 8 KB.

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*        Uwe Seimet                   *
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stettbac@isibee5 (Juerg Stettbacher) writes:


>Hello world

>The DSP56001 has 3 memory spaces (X, Y and P).
>X and Y are data memory spaces. Their sizes depend on
>the particular application. P holds the program.

>Question: What's a reasonable size for program memory P.
>(Common DSP applications with  monitor for stand alone.
>Software development in C and assembler).

>Any suggestions?


>Thanks
>juerg at ethz switzerland

The program size will also depend on your application.
I would suggest 8K x 24 as a minimum size for program memory.
8K x 8 chips are common and not too expensive. 3 parts will give you
the 8K x 24 program memory.
I also believe Motorola makes a 8K x 24 part.

If your application will be large you could go to 32K x 24 by using
three 32K x 8 parts. This is somewhat more expensive, but still not
too bad.

It is also possible to use the same parts for X, Y and P memory.
You need a fast address decoder to do this, but it saves on memory
chips.


-- 
------------------------------------------------------------------------------
Robert Wiegand - Motorola Inc.
uunet!motcid!wiegand
Disclamer: I didn't do it - I was somewhere else at the time.

wiegand@rtsg.mot.com (Robert Wiegand) writes:
>stettbac@isibee5 (Juerg Stettbacher) writes:

>>Question: What's a reasonable size for program memory P.
>>(Common DSP applications with  monitor for stand alone.
>>Software development in C and assembler).
>>Any suggestions?

Hi !
----
I've designed a 56K system some time (with many aids as I never did such a
large project before) ago using 3 128Kx8 chips to provide P: and X: memory
at a time... This is possible because the 56000/1 can only adress ONE of the
three memory spaces at a time...

I found that there are very little applications using more that 16K of P-Space
But as I used the Host-Interface to upload new code-segments it might be useful
to have more if You want to develop and run 56K code without resetting it...

Ciao...
    nummer_5@obh.in-berlin.de

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