kicad-developers team mailing list archive

[Jon Evans <jon@xxxxxxxxxxxxx>]

In many commercial tools you can use some or another feature to mark up the
design at the schematic level with what components "go together".
Then that information is used during PCB placement, the first-pass arrange
of components when you start designing a board can place those components
together, but it is also possible to group them together and move as a
group easily, etc.

There are even some tools that automatically identify bypass capacitors
(did the schematic have a capacitor drawn right near a pin on an IC?  In
that case, assume it's a bypass cap) and can place them right near the IC
(and run ERCs to make sure you don't have missing bypass caps, DRC to make
sure they are close enough to the power pin in the layout, etc)



On Mon, Mar 5, 2018 at 1:49 PM, Russell Oliver <roliver8143@xxxxxxxxx>
wrote:

> In terms of automatically arranging  components a force directed graph
> algorithm may work quite nicely, especially if the algorithm is seeded with
> the layout of components on the schematic.
>
> A simplistic version would be to just arrange components on board sheet as
> to their position on the schematic sheets.
>
>
> On Tue, 6 Mar 2018 05:07 Andy Peters, <devel@xxxxxxxxx> wrote:
>
>>
>>
>> > On Mar 5, 2018, at 10:49 AM, Wayne Stambaugh <stambaughw@xxxxxxxxx>
>> wrote:
>> >
>> > I was thinking one level of abstraction higher where I just input my
>> > design requirements and it spits out a schematic, full simulation to
>> > match the design requirements, and a completed board layout.  That would
>> > make my job a *lot* easier. ;)
>>
>> Maybe it can do my FPGA design for me, and also write firmware for the
>> ARM processor too! Why am I doing all of this hard work when I could be
>> drinking coffee and reading the New York Times?
>>
>> > All kidding aside, I was told by a very highly skilled board designer
>> > not to waste our time with auto-routers because no one actually uses
>> > them except for the simplest designs with lots of free board space and
>> > few or no routing restrictions.  This is someone who uses Altium in his
>> > day job and has laid out far more boards than I have.
>>
>> At the previous day job, we did VME and CompactPCI single-board
>> computers, and the layout people took advantage of full-up Specctra
>> autorouting. The designs had a lot of wide parallel buses and suchlike
>> which could be autorouted, but there was still plenty of stuff on those
>> boards which needed to be routed manually. And setting up constraints for
>> the autorouter was still a couple of days work.
>>
>> At the current job everything is smaller. Each product has multiple
>> boards that need to connect correctly. Boards are mixed signal, they have
>> power supply parts, there are connectors that poke through the enclosure,
>> etc etc etc and suffice it to say we never autoroute. Assisted routing,
>> like the Kicad push-and-shove, and Altium’s “bus routing” (a feature I’d
>> like to see in Kicad, for sure!) goes a long way.
>>
>>
>> > I'm guessing auto-routers appeal to hobbyists rather than professionals.
>>
>> How many questions on forums do you see from hobbyists asking about how
>> to autoroute, or wondering if the results from the autorouter are good?
>>
>> -a
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