Re: 747 Rom Emulator / design

[Steven Ciciora <ciciora@Ciciora.com>]

Exactly.  For ecms like the 7747 and it's slow aldl, this could be nice.
I didn't want to talk out loud on the things I'd like to do, 'cause then
we would end up with a big discussion on how to include all the features
in the world, such as fuzzy logic based neural network auto tuning of the
maps, etc, and nothing would get done.  Besides, it would make me look bad
if I never got around to finishing :-)

- Steve
 Still trying to find time to read the xilinx manual I got last night

On Thu, 27 Jul 2000, rr wrote:

> 
> Hmm, other things? Maybe mirror the ecm ram and send the
> data out the serial link to the laptop?
> 
> BobR.
> 
> Steven Ciciora wrote:
> 
> > On Thu, 27 Jul 2000, rr wrote:
> >
> > >
> > > Dual port ram is really not required. It's expensive and can be
> > > tough to get. Remember that the ecm's bus cycle time is almost
> > > a usec. Some 100 to 150 nsec SRAM can easily be updated
> > > within a part of the cycle.
> >
> > But isolating the RAM from the ecm bus and from the PIC bus takes a
> > bunch of 20 pin chips.  This is why I bought a Xilinx development system
> > (It was delivered today; can hardly wait to get home!).
> >
> > >
> > > Another way to look at it is: Does it matter if the ecm goes into
> > > limp when your updating the ram, you can't be driving at
> > > the same time your punching keys on a laptop.
> > >
> > > BobR.
> >
> > There are _other_ things I want to do, besides an eprom emulator :-)
> >
> > - Steven Ciciora
> >
> >
> 
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