Adding memory

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SeeCwriter
Posts: 606
Joined: Mon May 12, 2008 10:55 am

Adding memory

Post by 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
Posts: 445
Joined: Fri Apr 25, 2008 5:26 am

Re: Adding memory

Post by 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
Posts: 606
Joined: Mon May 12, 2008 10:55 am

Re: Adding memory

Post by 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
Posts: 833
Joined: Thu Apr 24, 2008 3:59 pm

Re: Adding memory

Post by 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?
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