Le 18/06/2015 20:17, Jon Neal a écrit : > The code for placing a micro via in the push and shove router was just > using the regular/through via drill size. Reported in this bug: > https://bugs.launchpad.net/kicad/+bug/1464332 > > This fixes that, but I did notice that the code does not check to make sure > that the layers are adjacent. There was a bit of back and forth on how to > handle layers with micro vias since they technically only go from one layer > to an adjacent, but they can also be stacked one on top of another. > > I don't know enough about micro vias to put that sort of check in the code > without other people's inputs. > > Also, are blind/buried vias just the regular via size, or should they be > micro vias? > > Jon
Thanks. I just commit it. Blind/buried vias are just regular via size/drill. Technically, micro vias only go from one layer to an adjacent. Depending on your board maker, they can also be stacked one on top of another (i.e. they are Blind/buried vias) or not (this is a constraint really subject to change). Therefore, you can see micro vias as blind/buried vias. However, when routing a board, it is really hard to see if a blind/buried via is on a given layer or not. Due to the fact micro vias are mainly used to connect a hight density BGA to other layers, kicad (in legacy mode) accepts only micro-vias from an external layer to the adjacent layer (you can use a buried via to connect an other layer). Of course, this can be discussed, but the advantages are: 1 - It is more easy to know what are the layers connected by a micro via. 2 - It is (by far) easy to place a micro-via: you do not have to select the target layer when placing it. -- Jean-Pierre CHARRAS _______________________________________________ Mailing list: https://launchpad.net/~kicad-developers Post to : [email protected] Unsubscribe : https://launchpad.net/~kicad-developers More help : https://help.launchpad.net/ListHelp
