Eagle 6 layer PCB design

On 1/22/2011 5:43 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?

 

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?

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???

 

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.

Hi Sandeep,

1. If you are using a polygon the polygon should be named GND not $GND.

EAGLE will automatically append the dollar sign to a layer name when

said layer is setup as a supply plane. If you're layer name has a $ in

it, then it has been defined as a supply plane in which case you

shouldn't use the polygon.

It's one or the other do not use a polygon with a $ layer.

2. Talk to your board manufacturer and ask what are their requirements

then adjust your DRC to that. Whatever errors are still present after

you have updated the DRC you must correct manually.

3. It sound like you used the wire command. In EAGLE the ROUTE command

is used to lay down traces not wire. Wire is only intended for artistic

purposes. I know the naming convention is funny but it's still used to

maintain compatability between EAGLE versions.

hth,

Jorge Garcia

Cadsoft Computer

On 1/22/2011 5:43 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?

 

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?

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???

 

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.

Hi Sandeep,

1. If you are using a polygon the polygon should be named GND not $GND.

EAGLE will automatically append the dollar sign to a layer name when

said layer is setup as a supply plane. If you're layer name has a $ in

it, then it has been defined as a supply plane in which case you

shouldn't use the polygon.

It's one or the other do not use a polygon with a $ layer.

2. Talk to your board manufacturer and ask what are their requirements

then adjust your DRC to that. Whatever errors are still present after

you have updated the DRC you must correct manually.

3. It sound like you used the wire command. In EAGLE the ROUTE command

is used to lay down traces not wire. Wire is only intended for artistic

purposes. I know the naming convention is funny but it's still used to

maintain compatability between EAGLE versions.

hth,

Jorge Garcia

Cadsoft Computer