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

[Mark J. Foster]

Hi, Tom!

Thank you very much for the solution! Dave hadn't mentioned your 
discussion with him, and Himax has continued to ask about the setup and 
hold times.  I've computed the results based on your email, and have 
sent them off to Himax for the DCON ASIC verification. If there are any 
additional questions, I'll definitely let you know!  Thanks again for 
all your help!

Cheers!
MarkF

Tom Sylla wrote:
> 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
>> _______________________________________________
>> Devel mailing list
>> Devel at laptop.org
>> http://mailman.laptop.org/mailman/listinfo/devel
>>
>>
>
>