Viewlogic Schematic Libraries

[Lameris]

I want to rework the viewdraw schematic libraries I have posted to http://groups.yahoo.com/group/innoveda_users/ to be compatible with the PowerPCB libraries posted here.

Does anyone have any suggestions or standards for their schematic symbols that I might use or consider in the library design.

For example should I use the attribute "NC" or signal="NC" for no connect pins?

Please post your comments here or email to glameris@yahoo.com

[Lameris]

One problem I have in syncronizing the Viewdraw schematic library to the PCBStandards PowerPCB libraries is that the Viewdraw supplied symbols have always used Pin2 as the positive terminal whereas the standard here is Pin1.

Should I:
Change the old schematic symbols to match Pin1 positive?
Design the libraries with Alpha-Numeric?

[Tom]

Gary,

I don't have an answer to your question, but I am interested in the solution. Keep me in touch when you decide which way to go.

Also, we are looking for a good Viewdraw library that comes with a simple specification guideline on how all the parts are built. Sort of "The Rules of the Road" so others can build symbols using the same guidelines. Users will also be able to suggest improvements to the specification.

A Viewdraw library that was linked to the pcbstandards decal library would be a major contribution to this website. Even if it was small, it's a starting point. We have the space for it.

[Lameris]

There are 2 ways to build the libaries, with DxDatabook and without DxDatabook...

With DxDatabook, attributes are stored in a Database. This makes it easy to use the same symbol with different decals, such as 14pinDIP or SOIC...

Without DxDatabook, attributes are stored in each part. If a library is built in this manner, there is a different symbol for each part.

I would lean toward building symbols using DxDatabook. The proposed libraries would be:
Passive, (Auto annotating Unit Magnitude creates some issues)
IC,
OtherSemi (Diodes transistors, Power IC's),
Connectors, Miscellaneous (Hardware, fudicials, testpoints),
Annotation (In, out, bi, drawing blocks, Powerpins, grounds, etc),

Attached is a file I use as my reference when designing schematic symbols. Any comments?

DEVICE maps to Part Type, PKG_TYPE maps to decal.

[Tom]

Gary,

I totally agree that DxDataBook is the way to go.

Storeing all your part Attributes, PDF links, Pricing Information, everything should be in DxDataBook.