-Peter Stuge Cool, that is great info to know. Both of my chips are 45-4C-NH. 45 Msec 4=10,000 write cycles (doc, thank you for the link) PLCC, 32
Is there any thing from the Linuxbios side of the world, besides the size config? Does Linuxbios load the whole chip into ram(so 256k or 512k), or just it's self on startup?
Speed in ns: What controls that? Can I set/change the access speed to my "bios chip"? I have a few boards that had Eon chips(120ns), I have replaced them with SST's(45ns), they work fine. Are they running faster? On this current project all I care about is boot time and ever 0.10 seconds I can save, counts. -Adam
Peter Stuge wrote:
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