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From: Chuck Simmons
Organization: You jest.
X-Mailer: Mozilla 4.61 [en] (X11; U; Linux 2.0.33 i586)
Subject: Re: simple question?
References: <firstname.lastname@example.org> <3D7A71DC.D9E97D62@webaccess.net> <email@example.com>
Date: Sun, 08 Sep 2002 01:07:08 GMT
NNTP-Posting-Date: Sat, 07 Sep 2002 18:07:08 PDT
"Jim (from Oz)" wrote:
> On Sat, 07 Sep 2002 21:38:55 GMT, Chuck Simmons
> >This is sort of a combination of the two and the kit has tools for both
> >the FPGA and the AVR. I haven't tried this one (no time - it is in a
> >cupboard) but I do use AVR. I have a deep dislike of Harvard
> >architecture but in the AVR ASIC I use, the Harvard architecture's most
> >glaring flaw is corrected.
> Why do you dislike the Harvard architecture Chuck? And, presumably,
> its PIC and Atmel implementations?
> Jim (from Oz)
I sort of bumped into Harvard architecture with DSP's. Impure
implementations are vastly superior to pure implementations because of
development issues. AVR is pure meaning it is a PIA in development. I
use an ASIC in which the problem is corrected. Since we had to use dual
port RAM for program memory in the ASIC, I fixed the problem by mapping
all of the AVR's program memory to data space by means of a jumper. This
simple idea has saved many hundreds of hours of my time. Harvard
architecture is hard to describe as anything but a disaster when
development involves 5 MPU's that interact in various ways and the
development tools are not common. That's why I fixed the problem. That's
why I'm a happy camper even though I preside over three AVR's in one
Note that two of the AVR's run at 80% utilization by design and the
third is anybody's guess. All I know is that it misses some interrupts
harmlessly. That is also by design. Call it life in the fast lane.
... The times have been,
That, when the brains were out,
the man would die. ... Macbeth
Chuck Simmons firstname.lastname@example.org
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