Re: state of PIC SRAM on boot

larwe wrote:
On May 11, 12:44 pm, Donald <Don...@xxxxxxxxxxxxxxxx> wrote:
FRAM != RAM
Guess what: <http://www.ramtron.com/doc/AboutFRAM/Default.asp>

"FRAM offers features consistent with a RAM technology, but is
nonvolatile like a ROM technology. FRAM bridges the gap between the
two categories and creates something completely new -- a nonvolatile
RAM."

Parallel FRAM looks pretty much exactly like SRAM from the system's
perspective; it is a drop-in replacement. e.g. <http://www.ramtron.com/
doc/Products/Nonvolatile/Detail.asp?ID=12&gr=6> is a direct drop-in
for a 62256 32Kx8 SRAM.

Not that the OP isn't on crack, of course, but your statement isn't
absolutely right, which is why it irked me to see it advertised as
such.

and to confuse you all even more, have a look a Maxims
high security "Low imprinting" SRAM technology.

Yes, seems SRAM is not truly random on power off, but does have
a statistical bias based on what was there last time....
Not good enough to get 100% data back, but I'm sure cracking teams
would love to have a 'better seed' than a random starting point.

Not likely to matter much, in the average PIC project :)

-jg


.

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