[Openec] Which pins to switch when for switching on an XO?

[Frieder Ferlemann]

Hi Richard,

"Richard A. Smith" <richard at laptop.org> schrieb am 09.09.2007 16:23:49:
> Frieder Ferlemann wrote:
> 
> > Just to show the kind of problems where I'm stuck:
> > F.e. LaptopPowerB2.pdf shows MAIN_ON being an Output of
> > the EC (which it is not (according to the register setting
> 
> Its both. It changes during the boot phase.  Details are in the CS5536 
> docs.  On boot its an input (to the CS5536) and then it changes to an 
> output when the laptop firmware enables it as a power management pin.
> 
> So the EC drives the signal when the CS5536 has been powered off but 
> then switches to an input.

Thanks for shedding light onto this:)

> > So long story short, information like:
> > 
> > On Suspend/Resume/Run, B1-Bx:
> > Pin A of IC B drives Pin C of IC D (..), needs voltage E
> > being stable, switches on voltage F with a nominal
> > value of G (wanted to be stable to H%) with a time
> > constant of K milliseconds
> 
> The best place to get a first round guess of this info is by reading all 
> the CS5536 docs.

I'll try to follow that path.

Greetings,
Frieder

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