kicad-developers team mailing list archive

[jp charras <jp.charras@xxxxxxxxxx>]

Le 06/06/2014 19:58, Lorenzo Marcantonio a écrit :
> On Fri, Jun 06, 2014 at 07:50:50PM +0200, jp charras wrote:
>> I am pretty sure this is a very old legacy code.
>> It is now allowed.
> 
> If it's allowed then no issue at all. It made me curious since the layer
> setup dialog doesn't allow it (and once I tried to do a one layer board
> and I searched for it).
> 
> Actually it's very new code. PCBNEW_CONTROL::LayerPrev, for the new GAL
> interface. Maybe he's simply been cautious.
> 
>> Were is this code?
>> Until now I never see a board which have *really* only one side
>> (however, could be a very interesting board, if exists).
> 
> There are a lot of THT boards that could be done on only one layer :D
> 

No.
In this case you are talking about one *routing* layer, not a board layer.
A board has always 2 * n layers ( You know that).
And has at least always 2 sides, therefore 2 layers (like a rope has
always 2 ends).

THT boards (and not only THT boards) that could be done on only one
*routing* layer, but this layer could be the back layer or the front layer.

Many time, Guys who make micro-wave boards use only the front layer, and
the back layer is a ground plane (not routed, but needed by micro-wave
requirements).

Other guys often use the back layer to route only one layer.

This is a matter of routing constraint, not a matter of layer count.

Do not become confused by a layer count and a layer routing constraint.
Only one routing layer does not mean one layer, and obviously not only
on side.

-- 
Jean-Pierre CHARRAS