[Arm-netbook] EOMA68-A20 2.7.4 pre-production prototypes received and working

[Wolfram Kahl]

On Wed, Jun 21, 2017 at 12:00:07PM +0100, Luke Kenneth Casson Leighton wrote:
> .On Wed, Jun 21, 2017 at 9:35 AM, mike.valk at gmail.com
> >>  in a stack you tell the factory what thicknesses you want, as well as
> >> what material in between, and what thickness of that, too.  so you get
> 
> > So it doesn't have to be a problem. As long as you control the layers
> > that have traces have the same thicknesses.
> 
>  technically correct but far too much risk and hassle.  you end up
> tying the PCB layout to a specific PCB manufacturing factory.

Are there high-frequency risks/problems with switching back and forth
between the layer pair so that each trace travels equal distances
on layer X and on layer Y?


Wolfram