On Fri, Aug 11, 2017 at 12:37 AM, Richard Wilbur <[email protected]> wrote:
> On Wed, Aug 9, 2017 at 7:23 AM, Luke Kenneth Casson Leighton > <[email protected]> wrote: >> next set... >> >> wiggles.jpg is the layer 6 length-matching area: HX2N/P is the one >> that's the longest, it snakes back on itself. i length-matched all 3 >> signal pairs to 56.413, and left the CK lines at 57.134 just to give >> the tiniest bit of delay (TI recommendations iirc). > > Very nicely done! 57.134mm - 56.413mm = 721um > => T(delay) = 721um / 150um/ps = 4.8ps > That is a very tiny delay! ooooOoo :) > Now that we have achieved such close > synchronization, I'm suggesting we go for the next goal where we > design a certain amount of inter-pair skew into the layout for > purposes of lowering the strength of our synchronized pulsing data > lines to a more diffuse chatter. *deep breath*.... aaaaaaaa! :) well.... that actually happens for the majority of the length in the middle (starting layer 6) but.... if i simply *take out* the intermediary wiggles on layer 6.... >> no - not even enough space to do 5.1mil / 5.0 clearance... just... too much. > > I understand. We might end up with more room--see discussion below. which has probably been truncated... >> the other images show the via'd portions, they're all either >> symmetrical or perfectly length-matched to 0.001mm. > > Again, they look nice.<div id="DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2"> whoops.... something melted there... _______________________________________________ arm-netbook mailing list [email protected] http://lists.phcomp.co.uk/mailman/listinfo/arm-netbook Send large attachments to [email protected]
