powerpcb invisible pin name
Hi, Santa and Uky:
Thank you two for the explanations. I partially solved the library reuse problems and now with more understandings of the system, I think it's better to create my own library from scratch.
The package I am using is MentorGraphic SDD2004, the design flow I am going to use is: DxDesigner for schematic, Library manager for parts generation(including symbol creation, padstack and cell generation), and Expedition for PCB layout. Since I am new to PCB design without any trainning, I found the online help system/tutorial is rather insufficient and poorly orgnized. For example, the DxDesigner tutorial is supposed to talking about DxD-->Expedition design flow, however, what the tutorial did is simply introduced the Dxdesigner and then divert to PowerPCB flow which is not part of the SDD package.
Just to share with you two the way I reused the libraries:
1. Using library manager to create you own central library
2. Copy all the cells and padstack files from WG2002\vbcore\central library
3. Import symbols from eProduct Designer Libraries provided by MentorGraphic
For the above flow, you can see that we cannot reuse the symbols from WG2002 central library(don't know why).
Well, I am now trying to generate a 244ball BGA package cell and encountered a probelm: I used 16 x 16 matrix to generate 256balls and late delete the redundant balls. After I finished all of these steps, I found the cell editor does not allow me to save the file with a pop up error of: the cell cannot be saved because 12pins are not placed. I am trying to find the solution by searching the online help now and also hope some of the experts here can help me. (maybe I can also leave the extra balls there but I am afraid that will get into trouble when I proceed to the stage to associate the cell with my 244 pin symbols to create a part).
By the way, is there any standard talking about how to generate PCB land patterns for different kinds of ICs such as BGA, VQFN etc?
Thanks!