[Arm-netbook] HDMI High-Frequency Layout: Recommendations--Taper

Richard Wilbur richard.wilbur at gmail.com
Fri Jan 5 16:02:01 GMT 2018


On Fri, Jan 5, 2018 at 4:05 AM, Luke Kenneth Casson Leighton
<lkcl at lkcl.net> wrote:
> On Fri, Jan 5, 2018 at 8:27 AM, Richard Wilbur <richard.wilbur at gmail.com> wrote:
>> On Fri, Jan 5, 2018 at 1:00 AM, Luke Kenneth Casson Leighton
>> <lkcl at lkcl.net> wrote:
>>>  rectangular all-layers keepout, showing 1 and 3 here... damn layers 2
>>> and 5 have a weird shape (not enough clearance auto-generated) let me
>>> make it an oval all-layers keepout instead...
>>
>> Those do look very nice, indeed!
>
>  did the trick.  pain doing them by hand, had to do the flood-fill,
> then adjust the keepout, then write down by hand the distances that
> the keepout fitted cleanly to the edges, _then_ throw that file away,
> _then_ go back and put the rectangle left-right... bletch :)
>
>  anyway i moved the PWM via up a bit, left the 3V3 VIAs where they
> were - sorted.

The results are great!  Thanks for all the hard work to make it happen.

So I'm happy with the layout of the HDMI!

I checked for vias in component pads (manufacturability issue) and
since the gerber viewer I'm using complains about all the tools in the
drill file when I load it, I can't see the via holes.  So there may be
several false alarms in this list.  Could even be mostly false alarms.
But I would definitely check out C3 on layer 1 as there seems to be a
via in the middle of one of the pads.  (Marked with red arrow in
attached picture.)
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´╗┐Component Pads Encroach Vias?

Layer 1

C59, C60, C71
*C3

Layer 6

C139
C341
C340
C345
C332
C343
C335
C43
C69
C70
C99
C86
C106
C107
C57
C45
C50
C105
C108
C85
C96
C54
C38
C55
C85
C40, C41, C44

C305, C307, C308


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