Lpc2000

Johan, your PCB layout system should almost force you in the right
direction. We use PADS (we are just starting up a four layer board design),
and the first thing you do is to define the two inner layers. The most
common approach is to use one inner plane for ground and one for power, most
likely 3.3V. You identify the net names (GND and VCC) for the planes to the
CAD system, and then it will take care of making the plane connections for
you. You can also route on the inner layers if you want to, but it is
usually a good idea to have at least one plane reserved for ground.
http://www.mentor.com/products/pcb/pads/index.cfm is a good starting point.
Regards,
Lars

-----Original Message-----
From: fredrikssonjohan [mailto:johan@...] 
Sent: Monday, October 03, 2005 5:07 AM
To: lpc2000@yahoogroups.com
Subject: [lpc2000] OT: 4 layer PCB

Hi!

Well, this is off topic from LPC's but here we go...

As my boards get more and more crowded I want to look at 4 layer PCBs
instead of my usual 2 layer ones. What I can't find is some good info
and tutorials of best practice and what you shall think of designing
a 4 layer card.

I guess (and hope) that some here in the group does 4 layer cards and
can point me somewhere or give a tip or two :-)

Looking forward to any input on the subject!

Cheers
/Johan





 
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