Hi Luke ive been doing some googling and found this https://drive.google.com/drive/mobile/folders/0B7HO8lbGgAqAT1pZQTBxM3gzRFk Are any of these files useful?
On 19 May 2017 20:20:31 GMT+03:00, Luke Kenneth Casson Leighton lkcl@lkcl.net wrote:
To undertake such a design reference design is needed. Without
reference
design it is virtually impossible or so time consuming that it makes
no
sense to even start. Luke pointed out some of most difficult parts
that
include memory design but also all other high speed parts (hdmi, usb
etc..)
then power section position i.e. position of capacitors, positions of
power
supply ic, then how to route ever increasing number of lines and so
on. Even
with well documented producers like TI or Freescale with all
documentation
and all reference cad designs it is hard.
yyep. usually i now just take a reference design and, as best i can, change as little as possible. on the RK3388 PCB i had to rotate the entire Power Management block - ICs, wires, power planes - by 90 degrees, to shoe-horn it into the available space. it worked. saved a *massive* amount of time, not having to redesign a power layout that is known to work.
and you know what? it worked! the power section worked perfectly, first time. ok, so i shorted out some of the inductors and blew up $200 worth of components, on one of the boards, but hey, omelettes and eggs... :)
l.
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