[gta02-core] LCM review

Dave Ball openmoko at underhand.org
Tue Jul 21 18:44:14 CEST 2009

Werner Almesberger wrote:
> Dave Ball wrote:
>>  - C6008 is missing.  This was added in GTA02, and is NC so it's 
>> omission might be deliberate and I've not added it.  Should we include 
>> this or not?
> It changed from 47 pF to NC after it was found that it degraded the
> PCLK signal considerably, which was linked to flicker in landscape
> mode:
> http://lists.openmoko.org/pipermail/openmoko-kernel/2008-March/001553.html

Excellent - one less to worry about  :-)

>> Because of how our components are laid out, the signals don't always go 
>> through the same filter component used in the gta01/gta02 schematics, 
>> but I think this is a sensible divergence from those schematics.
> I think we'll see how this goes when doing the layout. If necessary,
> we can always reshuffle signals that end up in inconvenient spots.

Yup - this got me thinking about optimising all the LCM signals to go 
through the most convenient filter, then my head started hurting.  So I 
stopped :-)


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