[sdiy] uC with mul

[patchell]

    Another alternative, if you have a micro with plenty of EPrpom resources (my last
project used a 68K), is to store the FPGA code as data in the EProm and then have the
microprocessor download it into the FPGAs.  I have also done this in a system using a
56K DSP as well.  Cool thing is if a customer needs some custom code and hardware, it
can all be done in one eprom.

    -Jim

harry wrote:

> Hey I hate to butt in but (i was playing here anyway)
>
> The initialization eeprom is very small compared to a computer
> program use.  Mine is an 8 pin DIP... chosen to be in a socket
> for field replacement.  You could choose an SMT part.
>
> I used OTP, flash is available at 10X the price.  I don't think I'll
> upgrade that often so I shoot the dice... hoping they are loaded in
> my favor. Ain't that what engineering is really about ???
>
> These are serial eeproms so very little board space is needed.
>
> H^) harry   (who still laments the development costs....)
>
> jbv wrote:
>
> > Paul,
> >
> > > > 2) I guess I need to get the development board + soft tools
> > >
> > > You dont need the board, just the chip in your own design..
> > > The tools, perhaps, at least some method of transfering data from the file
> > > into the binary format for the FPGA.
> > > The projet I am building with an FPGA will have the FPGA code stored on
> > > eprom, and the CPU will program the FPGA each time it powers up...
> >
> > Ah ah !!! I knew there was a trick !!!!    ;-)
> > extra eprom means additional component, additional cost, additional PCB room...
> >
> > The ready-made mul chip looks more & more attractive...
> >
> > > > If my project works, then I might consider replacing the mul by some
> > > FPGA...
> > > > Does that make sense ?
> > >
> > > yep, seems to..
> > > But then if it works, why change it?
> >
> > To be proud to have designed & made everything from scratch, and to have
> > a real application to explore and learn more about FPGA domain (which is what
> > DIY is all about IMHO)...
> >
> > >
> > >
> > > > And while I'm at it, here's another question :
> > > > if you guys need some FAST flash EPROM & RAM (both 64K x 16), which parts
> > > > would you choose ? I've seen some tempting AMD chips...
> > >
> > > how fast?
> > >
> >
> > As close to 10 ns as possible.
> >
> > As for SRAM, I spotted the Samsung KM6161002AJ15 (64K x 16 - 15 ns)
> > and for Flash, the 29F400 (AMD & Samsung AFAIR - 256Kx16).
> > According to the data sheet, the 29F400 is available in 90, 70 or 55ns, but
> > I only found 90ns from distributors...
> > Of course, there's always the trick to load some parts of the ROM into fast
> > SRAM at startup...
> >
> > Best,
> > JB
>
> --
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--
 -Jim
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