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Flash, EEPROM, PROM or external storage?

G

Ghazan Haider

Jan 1, 1970
0
In a project of a small computer using an ARM720 MCU with built in
sdram and flash controllers, what is the cheapest storage solution for
8-32 megabytes? Most designs Ive seen use flash, but I thought EEPROM
was cheaper. I havent seen PROM in sizes larger than 2MB either. Is
compactflash cheaper than boot block flash chips?
 
J

John Devereux

Jan 1, 1970
0
In a project of a small computer using an ARM720 MCU with built in
sdram and flash controllers, what is the cheapest storage solution for
8-32 megabytes?
Flash.


Most designs Ive seen use flash, but I thought EEPROM
was cheaper.

Only in very tiny sizes (<1Mb)

I havent seen PROM in sizes larger than 2MB either.

I don't think anyone still use PROM.
Is
compactflash cheaper than boot block flash chips?

I expect so, for large enough sizes.

Suggest you use a "boot block flash chip". I suspect that your ARM
cannot boot directly from compact flash anyway (I may be wrong here, I
don't know much about CF or which ARM variant you have for that matter!).
 
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