Eagle 6 layer PCB design

On 01/22/2011 05:43 PM, Sandeep wrote:

Hello everyone!

I am designing a 6 layer PCB in eagle. I am finished with the routing

already. I have few queries and I would highly appreciate if someone could

clarify it.

 

1. I have used a polygon for ground plane and named it as $GND. I have also

named all the ground nets as GND. However after creating a polygon and

clicking on ratsnest tool, all the ground nets are still not connected to

ground plane? Why?

You either use a polygon name gnd or set the layer to power plane and

and it's name should be gnd. I think it appends the $. I don't use power

planes.

 

2.After checking for DRC errors, I'm getting 1700 errors!!! Most of them

are clearance issues. I can't manually fix all of them. Should I change DRC

clearance setting?

A lot could be related to the $gnd polygon.

3. I routed critical parts manually first and then I tried to use

autorouter however it routed all the airwires again and autorouter did not

take my manual routing into consideration. What I thought was it would

route only the airwires which I din't route manually. Any clue on this???

 

Did you use wire or route?

I have few more questions but I would wait for someone to reply first.

 

P.S. I have .sch and .brd file for my design. If someone would like to have

a look and give me suggestions then I would be more than happy to upload it

here.

I would suggest you start with a very simple a few resistors and one IC

  project with your 6 layer setup and get that to work. Then go and fix

your real project.

Don't use power plains just cover the required layers with a polygon's

for your power and ground.

Paul R.

On 01/22/2011 05:43 PM, Sandeep wrote:

Hello everyone!

I am designing a 6 layer PCB in eagle. I am finished with the routing

already. I have few queries and I would highly appreciate if someone could

clarify it.

 

1. I have used a polygon for ground plane and named it as $GND. I have also

named all the ground nets as GND. However after creating a polygon and

clicking on ratsnest tool, all the ground nets are still not connected to

ground plane? Why?

You either use a polygon name gnd or set the layer to power plane and

and it's name should be gnd. I think it appends the $. I don't use power

planes.

 

2.After checking for DRC errors, I'm getting 1700 errors!!! Most of them

are clearance issues. I can't manually fix all of them. Should I change DRC

clearance setting?

A lot could be related to the $gnd polygon.

3. I routed critical parts manually first and then I tried to use

autorouter however it routed all the airwires again and autorouter did not

take my manual routing into consideration. What I thought was it would

route only the airwires which I din't route manually. Any clue on this???

 

Did you use wire or route?

I have few more questions but I would wait for someone to reply first.

 

P.S. I have .sch and .brd file for my design. If someone would like to have

a look and give me suggestions then I would be more than happy to upload it

here.

I would suggest you start with a very simple a few resistors and one IC

  project with your 6 layer setup and get that to work. Then go and fix

your real project.

Don't use power plains just cover the required layers with a polygon's

for your power and ground.

Paul R.