Since I have now used the good part of a week getting a 23K256/640 running (with no success), I need to find an alternative.
I need 3kByte or more external ram.
SPI seems to be the interface for speed (up to 8MHz with the Atmega128 running at 16MHz).
I know about the external ram option and has used it before, there is just not room on the board for a latch and ram, and I only need 3-6kBytes.
I2C eeprom will be much too slow, taking several ms to write the data, and eventually failing, I dont need to retain the data without power.
The smallest mega with 4kb is 64pins, so thats not really an option either.
Price max 10$ in QTY 10.
I would prefer a 8-16pins chip, is there anything outthere thats fits the bill ? :)