[Arm-netbook] HDMI High-Frequency Layout: Timing
Luke Kenneth Casson Leighton
lkcl at lkcl.net
Tue Aug 1 15:11:21 BST 2017
On Tue, Aug 1, 2017 at 2:51 PM, mike.valk at gmail.com <mike.valk at gmail.com> wrote:
[trimming a huge amount of unnecessary context on your behalf, mike...
>> there's a lot of other stuff in here which is really good, such as
>> making sure that lengths on each *layer* are matched, and that even
>> when turning corners the lengths are matched. and matching just after
>> VIAs *not* before... damn
> Between via's the length should be matched right? Length mismatch
> should be solved as soon as possible to accommodate eddy-currents
yes. the toradex article explains it very well, also mentions the
importance of symmetry (as does the TI post).
> Found a nice post from TI
nice! dang, above 10ghz the thickness of the via starts to matter
and needs to be drilled out, post-production. dang.
*sigh* unfortunately symmetry is not completely achievable with the
drastically-reduced amount of space available. the HDMI signals come
out right at the bottom of the board.
>> so thank you - much to correct and think about. really appreciated
>> you finding all this stuff richard.
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