MEM11A Update

Guy Sotomayor ggs at
Thu Mar 17 23:57:34 CDT 2016

> On Mar 17, 2016, at 9:15 PM, Eric Smith <spacewar at> wrote:
> On Thu, Mar 17, 2016 at 3:35 PM, Guy Sotomayor <ggs at> wrote:
>> I’m planning on doing a 4 layer board so I can avoid having routing issues due to 3 different
>> power supply voltages (yea, modern low voltage design meets 5v).  I haven’t done a 4 layer
>> design before, so I’m in for a bit of learning (mainly on how to “pour” the inner layers).
> In Eagle, you use the polygon tool, select the layer, and draw the
> polygon for the entire board outline (or wherever you want the pour).
> Then you use the "name" tool, select the polygon, and give it the name
> of the net you want it connected to (e.g, GND).  Once you've done
> that, any time you do a ratsnest command, Eagle will recalculate the
> polygon and connect all through-holes of that net to the polygon (with
> thermals by default). It doesn't recalculate as you add or move
> components, so it will look wrong until you give another ratsnest
> command to recalculate it.
> While working on the layout, I find the display gets annoying with the
> polygons shown. Rather than hiding those layers, you can type "ripup
> @;" to remove the polygon routing until the next ratsnest command. I
> do that because I often have a few signals going through the layers
> that are otherwise mostly power planes, and I don't want to hide the
> entire layers because I want to see those signals.
> Of course, this also works on the top and bottom side if you want
> copper pour there.

Thanks.  I think I have it mostly figured out.  ;-)

Still have to place all the caps.  ;-)  Then I can start to route everything.

TTFN - Guy

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