[sdiy] uC with mul

[harry]

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

--
Jihad Terrorism Conspiracy New World Order
Revolution Black Helicopters Freedom of
Speech First Amendment Rights: Carnivore Bait
go ahead and READ my e-mail I have nothing to
hide... how about YOU ???