> 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. _______________________________________________ arm-netbook mailing list [email protected] http://lists.phcomp.co.uk/mailman/listinfo/arm-netbook Send large attachments to [email protected]
