[OLPC-devel] Status report... Video Timing Question is H/W

[Tom Sylla]

dwmw2 asked about this on IRC, and I thought I answered him.

I talked with one of the silicon folks about this, and he agreed with my 
explanation of the datasheet.

The tH and tSU are for *inputs*, which I think are datasheet vestiges. 
For *outputs*, the numbers are all there, tVAL1, tVAL2, and tVAL3.

"hold time" is tVALmin
"setup time" is PERIOD-tVALmax

1, 2, and 3 are for the DRGBs, LDE_MOD, and SYNCs respectively. If any 
scope shots or otherwise don't seem to be matching those specs, just let 
AMD know.

Tom

Mark J. Foster wrote:
> Hi,Chris!
> 
> Thanks for the great notes!  The information that I am looking for from 
> AMD are the setup and hold times for the TFT interface's video outputs. 
> Ostensibly listed in Table 7-10 in the Geode manual, the critical Tsu 
> and Th figures are missing!  There's no impact on the fbdev driver - 
> this is purely a hardware issue that is critical for the DCON ASIC.
> 
> Cheers!
> MarkF
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