> You will find that there is a great selection of serial EEPROM
devices
> available, but they are slow (4 msec write times) compare to serial
> RAM. I don't know of big SRAM devices, but I'm sure they exist.
> SPI RAM is easy to hook up. (SCK, SDI, SDO, *CS). I2C is simpler to
connect
> (SCL SDA), but there is a limit to how many you can cascade on a
given
> bus, and the software is more complex.


Don't forget about FRAM from www.ramtron.com
Granted they have their quirks, but basically it's a drop in
replacement for serial EEPROMs, but they have much faster write speeds
and greater write endurance.

(quirks include the fact that internally reads are destructive -
internally it is rewritten after a read - so read endurance = write
endurance. Although write endurance is still more than 100 times that
of EEPROM)

-Denny

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