- Fri Jan 29, 2016 6:57 am
#187689
Yes, another question about polygons...
Following the instruction of the IC manufacturer, I have to create and independent ground plane for the oscillator stuff and route it directly to the ground pin of the IC itself. I thought: "it's easy! I will use polygons!", but I have encounterd a small problem.
I have created a new project from the scratch just for fun/experimenting. What follow is what I have done.
In the schematics:
1. I have joined the GND connector-pin and GND IC-pin to the same net named "GND" (by using the net tool);
2. I have joined oscillator caps GND pin to another net named "GND2" (by using the net tool);
In the PCB layout:
1. I drawn a polygon around the oscillator stuff, named it as "GND2" (with Rank = 1);
2. I drawn a polygon around all the board, named it as "GND" with (Rank = 2);
Here the result Next there was a problem: the inner plane is well isolated from the rest, but I need to route it to the GND-pin of the IC anyway. I thought: "how I can achieve that?"
In the schematics both planes belong to separated nets: GND and GND2. This means that if I draw a net-wire between them EAGLE will ask me to join the nets adopting one name. If I do so, in the pcb layout editor, the separated plane will be merged into one, covering the entire board. Grrrrrr!
My solution is to keep the two nets independent and manually route a new trace from the inner ground plane to the GND pin of the IC:
By hitting the ratsnest button I've got what I want:
Here arrive my question. By hitting the DRC button I get two overlap errors (see image in the next post): there is no way to avoid that errors?
I mean... there is no clean way to add an additional route to a pad without having EAGLE complaining about that? :think:
Following the instruction of the IC manufacturer, I have to create and independent ground plane for the oscillator stuff and route it directly to the ground pin of the IC itself. I thought: "it's easy! I will use polygons!", but I have encounterd a small problem.
I have created a new project from the scratch just for fun/experimenting. What follow is what I have done.
In the schematics:
1. I have joined the GND connector-pin and GND IC-pin to the same net named "GND" (by using the net tool);
2. I have joined oscillator caps GND pin to another net named "GND2" (by using the net tool);
In the PCB layout:
1. I drawn a polygon around the oscillator stuff, named it as "GND2" (with Rank = 1);
2. I drawn a polygon around all the board, named it as "GND" with (Rank = 2);
Here the result Next there was a problem: the inner plane is well isolated from the rest, but I need to route it to the GND-pin of the IC anyway. I thought: "how I can achieve that?"
In the schematics both planes belong to separated nets: GND and GND2. This means that if I draw a net-wire between them EAGLE will ask me to join the nets adopting one name. If I do so, in the pcb layout editor, the separated plane will be merged into one, covering the entire board. Grrrrrr!
My solution is to keep the two nets independent and manually route a new trace from the inner ground plane to the GND pin of the IC:
By hitting the ratsnest button I've got what I want:
Here arrive my question. By hitting the DRC button I get two overlap errors (see image in the next post): there is no way to avoid that errors?
I mean... there is no clean way to add an additional route to a pad without having EAGLE complaining about that? :think:
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Last edited by gimpo on Fri Jan 29, 2016 9:09 am, edited 2 times in total.