14 Sep
2007
14 Sep
'07
5:01 p.m.
Many years ago I hacked a driver to program 27xx's using a SD systems S100 programming
card.
If memory serves me correct the the I was using want a 100ms pulse to each address 100
times to build
up the bits with out over heating the gate. It has been over 30 years since did it. There
were several
voltages and duty cycles that were prefered by different chips, but that info was stored
in what now are
mostly dead brain cells. Now I will have to go look for the SD card, I am sure it is still
in storage in one of
the boxes ....
later
The other Bob
On Fri, 14 Sep 2007 16:49:21 -0700 (PDT), Chris M wrote:
--- Chuck Guzis <cclist at sydex.com> wrote:
> On 14 Sep 2007 at 16:13, Chris M wrote:
>
> > Isn't the main issue when programming these
> things
> > the applied voltage?
>
> Not entirely--particularly in the 128Kbit and under
> categories, the
> programming algorithm could vary significantly from
> vendor to vendor.
> I suppose that if one programmed an EPROM slowly
> enough, one might
> be able to do it in an algorithm-independent manner,
> however.
I'm not familiar with algorithmic steps in eprom
programming. Could this roughly be likened to a
protocol like those used in serial communications (if
I'm correct, I'll assume they'd be much simpler).
On the other hand does the programming algorithm
translate to the *timing* issues that were mentioned
in a previous post? Or are they related to
rise-and-fall times and that such issues.
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