[sdiy] I'd like to design a usb or card i/f for patch storeage

[Colin f]

> Maybe it is easier and also useful to just design a card that 
> is based on ferroram/MRAM instead of static RAM + battery.
> 
> Ferrorram works like static RAMs but are non volatile!
> 
> I work with RAMTRON and Everspin parts. Both of them work fine.

A word of caution about FRAM - it does not work *exactly* like SRAM.
The FRAM address lines are latched on the falling edge of CE.
You can access different locations on an SRAM by changing the address lines
while leaving chip enabled.
I've used FRAM was to replace the internal SRAM in a TR909, and that needed
the ALE signal patched into the address decoder to make CE behave as
required.

Cheers,
Colin f