<html><head></head><body>Hi Luke ive been doing some googling and found this<br>
<a href="https://drive.google.com/drive/mobile/folders/0B7HO8lbGgAqAT1pZQTBxM3gzRFk">https://drive.google.com/drive/mobile/folders/0B7HO8lbGgAqAT1pZQTBxM3gzRFk</a><br>
Are any of these files useful?<br><br><div class="gmail_quote">On 19 May 2017 20:20:31 GMT+03:00, Luke Kenneth Casson Leighton <lkcl@lkcl.net> wrote:<blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
<pre class="k9mail"><blockquote class="gmail_quote" style="margin: 0pt 0pt 1ex 0.8ex; border-left: 1px solid #729fcf; padding-left: 1ex;"> To undertake such a design reference design is needed. Without reference<br /> design it is virtually impossible or so time consuming that it makes no<br /> sense to even start. Luke pointed out some of most difficult parts that<br /> include memory design but also all other high speed parts (hdmi, usb etc..)<br /> then power section position i.e. position of capacitors, positions of power<br /> supply ic, then how to route ever increasing number of lines and so on. Even<br /> with well documented producers like TI or Freescale with all documentation<br /> and all reference cad designs it is hard.<br /></blockquote><br /> yyep. usually i now just take a reference design and, as best i can,<br />change as little as possible. on the RK3388 PCB i had to rotate the<br />entire Power Management block - ICs, wires, power planes - by 90<br />degrees, to shoe-horn it into the available space. it worked. saved<br />a *massive* amount of time, not having to redesign a power layout that<br />is known to work.<br /><br /> and you know what? it worked! the power section worked perfectly,<br />first time. ok, so i shorted out some of the inductors and blew up<br />$200 worth of components, on one of the boards, but hey, omelettes and<br />eggs... :)<br /><br />l.<br /><br /><hr /><br />arm-netbook mailing list arm-netbook@lists.phcomp.co.uk<br /><a href="http://lists.phcomp.co.uk/mailman/listinfo/arm-netbook">http://lists.phcomp.co.uk/mailman/listinfo/arm-netbook</a><br />Send large attachments to arm-netbook@files.phcomp.co.uk</pre></blockquote></div><br>
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