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 26 Jan 2006, 9:49 PM
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jim2000
Joined on 01-14-2006
Posts 105
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Thanks and more questions
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Hi, Chris:
Thank you very much!
1. I want to know how to define a special pad (different size).
2. There are different powers in my system. For example, 3.3v, 1.8v, 2.5v, A/D power and D/A power, Could I splite the power plane into 5 parts.
Thank you again
Jim
Forum: Basic PCB Design
Posted: : Thursday, January 26, 2006 8:19 AM [GMT -5]
Post Subject: : Re: Thank you very much cseltzer wrote: | Jim,
In the padstack spreadsheet there are two rows, "DRILL" and "DRLDWG". Set both of these to the size of the drill that you want to use. The only selection for pad shape for these two rows is round or undefined since the drill can only be round if it is used.
Good luck,
Chris Seltzer |
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27 Jan 2006, 7:21 AM
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cseltzer
Joined on 06-11-2002
Largo, FL
Posts 853
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Re: Thanks and more questions
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Jim,
If the pad is for a via, there are several unused vias defined in Layout. Select one of these and adjust the properties to meet your requirements. If you want to define a new Padstack for a footprint, open the padstack spreadsheet. Click on a padstack name. This will select all of the pad layers. Press (<control> + <c>, the windows copy comand, this will create a new padstack which will be a copy of the old padstack. Adjust the properties and note the name. Using the pin tool in Layout select the pad that you want to make the new pad by clicking on it. Right click and select properties. Assign the new padname and you should be all set.
To split a power of ground plane assign one and only one net to the plane. This will become the default net for that plane. Any area that you do not modify will be that net. For each new net that you want to assign to that plane, create a "copper pour" and draw it in the shape that you need. Assign it to one of the other nets. Repeat until done. Use the "z-order" to set one pour dominate over another, if needed. Do not use "copper areas" for this! Copper areas on plane layers are voids in the copper. Also be carefull about getting a pour outline too close to a via. The via spokes will disappear. If too many disappear the via will disconnect from the plane layer.
Another reminder. This forum is for problems or requests for all of the forums in general. The forum that you should be posting to, is the "Basic PCB Design" forum. The descriprions under the forum title describe what should be posted there. Posting to the appropriate forum will help to keep this knowledge base properly orginized and will also ensure that the people who can answer your questions will see them. Not everybody views all of the forums.
Chris Seltzer
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OrCAD Community » OrCAD Community Forums » Basic PCB Design » Thanks and more questions
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