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Topic: Difference between EEPROM and flash memory (Read 5044 times) previous topic - next topic

fungus


I think it's just the picture - it's listed as 8 pins. The datasheet won't load - the microwave is on see, of which my router is cleverly sat next to. Long story.  8)


I loaded the datasheet and it was 16...

No, I don't answer questions sent in private messages (but I do accept thank-you notes...)

jtw11

Quote
I loaded the datasheet and it was 16...
Ah - I'll continue the search.

Why the point re FAT file systems? Does the SD library use it? I haven't yet used the library?

fungus


Why the point re FAT file systems? Does the SD library use it?


Yes.
No, I don't answer questions sent in private messages (but I do accept thank-you notes...)

CrossRoads

http://uk.farnell.com/spansion/s25fl256sagnfi001/memory-flash-256mbit-8wson/dp/2136254

That part is a type of Flash memory, not SRAM. It does have 16 pins.

Designing & building electrical circuits for over 25 years.  Screw Shield for Mega/Due/Uno,  Bobuino with ATMega1284P, & other '328P & '1284P creations & offerings at  my website.

jtw11

Crossroads, we've got on to talking about using external flash to store logged data as opposed to SD cards.

CrossRoads

Designing & building electrical circuits for over 25 years.  Screw Shield for Mega/Due/Uno,  Bobuino with ATMega1284P, & other '328P & '1284P creations & offerings at  my website.

fungus

#36
Nov 11, 2012, 07:15 pm Last Edit: Nov 11, 2012, 07:30 pm by fungus Reason: 1

Crossroads, we've got on to talking about using external flash to store logged data as opposed to SD cards.


I just remembered you were talking about storing data tables in there. It's easy to use fixed addresses in the memory chip for that sort of thing instead of going through all the layers of FAT (hah...I made a pun!)

No, I don't answer questions sent in private messages (but I do accept thank-you notes...)

CrossRoads

I could agree with that. Easy to control where you're accessing.
Designing & building electrical circuits for over 25 years.  Screw Shield for Mega/Due/Uno,  Bobuino with ATMega1284P, & other '328P & '1284P creations & offerings at  my website.

jtw11

#38
Nov 11, 2012, 11:11 pm Last Edit: Nov 11, 2012, 11:37 pm by jtw11 Reason: 1
For those lookup tables as part of my code, I'm happy to save these in the onboard flash using PROGMEM. I plan to use this external flash for logged data, but looks like I need to do some reading up on file systems, how to address certain bits of the flash etc etc. Any good reading links?

Going back to the quoted comment below, I do not follow the logic?


Please note that your going to end up coping everything to and from internal sram constantly so your not necessarily during yourself a favor trying to use offboard sram. 


Surely that's not particularly a problem, as I mentioned before - PCs for example use external RAM. Surely it's better to copy to external RAM, than to not and then run out of internal RAM?

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