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. :)
//Peter