Fabienne at 13:26, 22 May 2007

2007-05-22T13:26:31Z

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== How do I autoroute a one-sided circuit board with the autorouter? ==

Set e.g. "copper bottom" visible and all other copper levels ("copper inside" and "copper top") "other" and "invisible", in layers in the menu "View". Only "invisibly" not is sufficient.

== The autorouter uses vias which are too big . How can I set the size of these vias? ==

In PCB view, select in key [.]. A via symbol will be fixed to the cursor. Now press the key [o] (for '''o'''ptions). In the dialog you can fix the desired parameters (width x height, drillhole diameter, etc.). Then press OK and [ ESC ]. and start the autorouter again.

== How do I autoroute a one-sided circuit board with the autorouter? ==

If you want to have the tracks on layer 2, copper bottom, choose function "copper bottom" at layer 2 and set it visible (tick the colored box in the layer tool). Set the functions of the other copper layers (10: copper inside and 13: copper inside and 16: copper top) to "other" and "invisible" (untick the colored box). Only switching them "invisibly" not is sufficient. Now your project has only one copper layer, it is layer 2: copper bottom. That is the one where routing later will be possible.

== How do I create a 4times multilayer circuit board? ==

Change the function "other" of levels 10 and 13 to "copper inside". The autorouter routes now on all copper layers, also supply signals, e.g. GND and VCC.

What do I have to consider with the autorouter, if I want to disentangle a 4times multilayer circuit board and the internal copper positions shall serve supply for " GND " and " VCC "?

* For a 4times multilayer circuit board the copper layers 2, 10, 13 and 16 are important.
* route first all signals with the autorouter, which are not power signals.
* Set the following copper layer functions:
** Layer 2: "copper bottom"
** Layer 10: "other"
** Layer 13: "other"
** Layer 16: "copper top"
* Mark all signals except "GND" and "VCC" in the dialog "Autorouter", and start the autorouter afterwards.
* Now set for routing of the 1. supply layer (e.g. "GND" on 1st internal copper position)
** Layer 2: "other",
** Layer 10: "copper inside",
** Layer 13: "other"
** and the layer 16 "other".
* Mark the signal "GND " in the list, in order to route it. Start the autorouter.
* Set afterwards
** Layer 2: "other",
** Layer 10: "other",
** Layer 13: "copper inside"
** and layer 16: "other".
** Highlight the signal "VCC" in the list, in order to route it. Restart the autorouter.
* Afterwards activate all copper layers.

== Can I generate mass surfaces now on the internal supply situations? ==

You can provide the individual supply situations with ground, e.g. with the ground plane assistant. Select the appropriate signal, and set the aura to 0 mm, so that it is connected directly with the ground plane. '''Note:''' All plated vias, which connect the lower and the upper copper layer, must have an aura of e.g. 0.3 mm, otherwise a short circuit with the ground planes will occur. Therefore use plated-through holes with an adjustment of the aura of more than 0 mm. On 4times multilayer circuit board with ground planes, set the mounting holes (plated-through holes with width and height measurements smaller than the drillhole) with an aura as well. Also check the mounting holes of plug connectors or transistors.

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FAQ: Autorouter and Autoplacer - Revision history

Fabienne at 13:26, 22 May 2007