RE: Defender power supply requirements

> From: owner-rasterlist@synthcom.com
>
> > IIRC, you are correct. The +5 needs to come up/on *after* the
> > other voltages are stable (mainly the +12). This prevents the CMOS
> > from being written to before the system gets into a sane state.
>
> Could I just use the RST_PSPWRGD signal coming off the ATX
> power supply and tie it to the CPU reset? It won't go high
> until both 5 and 12 volt rails are good. At least that's how
> it's used in computer motherboards.

   I am not 100% sure, and just for the reason you explain: the "Power
Good" signal indicates that both the +5 and +12 are ready to go (they
have "come up" completely). The Williams boards need to have +5 after
+12 is good. While I think that holding the CPU in reset will work, I
would not bet my life on it. YMMV...

   I would say "Try it," and see if you ever get CMOS corruptions! :)

   Peace!

> -->Neil

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-=- James R. Twine, MCP, (jtwine@jrtwine.com)
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Received on Wed Feb 19 19:35:48 2003