Adding memory

[SeeCwriter]

I want to add 2MB of external battery-backed ram to my motherboard. Can I do that with the MOD5234? It looks like there is only I/O access offboard.

Steve

[seulater]

You need to look at the docs, it has a full address/data bus. Cant send links for you now, restoring my computer.

[SeeCwriter]

I have looked at the docs, and it appears to me that the MOD5234 brings a 16-bit address bus, and a 32-bit data bus offboard. I don't see how I can address 2MB of offboard ram with a 16-bit address bus. But maybe I'm missing something.

[rnixon]

There are 16 address line, which means you can address 64k bytes per chip select. You could create a few banks of 64k, but nowhere near 2MB with a parallel address bus. I think there are only 16 data lines, not 32.

How about a serial scheme, such as EEPROM with SPI or I2C?