[LinuxBIOS] Fun easy question. 512Kb or 256Kb
stuge-linuxbios at cdy.org
Tue Feb 7 08:26:04 CET 2006
On Mon, Feb 06, 2006 at 10:41:02PM -0800, Adam Talbot wrote:
> Fun easy question.
> Messing about with my new board, and have an easy question. So I have
> both the SST 39SF020 and the 39SF040 flash chip. My payload is just
> filo; so I can fit Linuxbios on the 256Kb or the 512Kb flash chip. Is
> there any reason to use the 512Kb?
> Faster, slower, any thing else like that?
It depends on the second line of numbers on the package.
SST 39SF0x0(A) is on the first line
45-4C-NH(E) or something similar is on the second line
45/70 is read access speed in ns
4 is minimum life in write cycles
C is temperature range (Commercial 0c->70c or Industrial -40c->85c)
N is PLCC
H is 32 leads
E is lead-free
Page 20 of http://www.sst.com/downloads/datasheet/S71147.pdf
But, I doubt you would even be able to measure difference in speed
between 45 and 70 ns versions. :)
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