On 10 August 2017 at 10:45, Luke Kenneth Casson Leighton <[email protected]> wrote:
> --- > crowd-funded eco-conscious hardware: https://www.crowdsupply.com/eoma68 > > > On Thu, Aug 10, 2017 at 9:38 AM, [email protected] > <[email protected]> wrote: > > 2017-08-10 10:18 GMT+02:00 Luke Kenneth Casson Leighton <[email protected]>: > >> On Thu, Aug 10, 2017 at 9:01 AM, [email protected] > >> <[email protected]> wrote: > >>> 2017-08-09 15:23 GMT+02:00 Luke Kenneth Casson Leighton <[email protected] > >: > >>> 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. _______________________________________________ arm-netbook mailing list [email protected] http://lists.phcomp.co.uk/mailman/listinfo/arm-netbook Send large attachments to [email protected]
