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

[Hrvoje Lasic]

On 10 August 2017 at 10:45, Luke Kenneth Casson Leighton <lkcl at lkcl.net>
wrote:

> ---
> crowd-funded eco-conscious hardware: https://www.crowdsupply.com/eoma68
>
>
> On Thu, Aug 10, 2017 at 9:38 AM, mike.valk at gmail.com
> <mike.valk at gmail.com> wrote:
> > 2017-08-10 10:18 GMT+02:00 Luke Kenneth Casson Leighton <lkcl at lkcl.net>:
> >> On Thu, Aug 10, 2017 at 9:01 AM, mike.valk at gmail.com
> >> <mike.valk at gmail.com> wrote:
> >>> 2017-08-09 15:23 GMT+02:00 Luke Kenneth Casson Leighton <lkcl at lkcl.net
> >:
> >>> Make sure the'res as much solid GND on the layer above and below the
> >>> traces, again shielding.
> >>
> >>  these are layer 1 and layer 6, and layer 2 and 5 are solid GND.
> >
> > I was referring mostly to layer 3 and 4. The diff pair is either on 3
> > or 4.
>
>  no.
>
> > If it is on 3 a slab of GND should be on 4 and vice versa.
> >
> > It's
> > 1. Vsuply + components
> > 2. Ground
> > 3. HF
> > 4. HF
> > 5. Ground
> > 6. Vsuply + componnents
> >
> > Right?
>
>  no.
>
> 1. SIG1 + components
> 2. Ground
> 3. SIG3
> 4. POWR
> 5. Ground
> 6. SIG6 + componnents
>

this is what we have been using for our design more or less and that came
with freescale reference design as well.


>
>  there's only 3 signal layers: 1, 3 and 6.  there are NO HDMI
> diffpairs on layer 3.  i'm not happy about the fact that i have to use
> vias *at all* but there's no choice: layer 1 the 24mhz XTAL and the
> PMIC are in the way, and when you get to the DC3 connector the signals
> *have* to go round the back (layer 6) anyway.
>
> l.