Axp-Hardware Archive
Re: memory bus width (bits) on AXPpci33?

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On Sun, 7 May 2000, Ron Farrer wrote:

>
> Hello;
>
> Does anyone remember what the memory bus width (bits) was on the
> AXPpci33 motherboards? For some reason I seem to recall it being either
> 128-bit or 256-bit if all banks were filled with the exact same
> size/speed memory. Anyone remember for sure?
>
>
> TIA,
>
> Ron
> --

Hello Ron:

        Looking at the OEM Design Guide on pg 2-17 and 2-18 each simm
socket has 36 data lines, 4 for parity, and 32 for data. Since we bank
them in groups of two, it looks like the data path is 64 bits. I did not
see any mention of a 'wide' mode of 128 bits. I think the wide data paths
are in mobo's that lie beyond our humble AXPpci33's. I hope I'm wrong. Any
corrections out there?

Andrew

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