Re: Instruction And Data memory
- From: Keith Williams <krw@xxxxxxxxxx>
- Date: Fri, 20 May 2005 09:53:33 -0400
In article <d6kg3n$spo$1@xxxxxxxxxxxxxxxxxxxxxxxxx>, anno4000
@lublin.zrz.tu-berlin.de says...
> PeteS <ps@xxxxxxxxxxxxxxxxxxx> wrote in sci.electronics.design:
>
> > I assume you are looking at a processor that has support for such
> > things (or a system that has such a processor or MMU).
> >
> > The difference is that instruction memory is exactly that: memory
> > referenced during an instruction fetch (the newer processors
> > discriminate between the various bus cycle types) and data memory is
> > for just that: data.
>
> [snip explanation]
>
> I'd make explicit that there is no technical difference between
> instruction memory and data memory, in case that was what the
> intent of the OP's question. They are the same kind of RAM since
> drum storage was scrapped. Any differences in behavior are by design,
> not by the nature of one or the other.
Not necessarily. Instruction memory can be quite different than data
memory in a Harvard Architecture processor.
> Instruction memory runs with von Neumann's blessings, data memory
> doesn't.
Not on purpose anyway. ;-)
--
Keith
.
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