4 Replies Latest reply on Oct 22, 2014 2:03 AM by robert_davies

    Creating Special components

    rykiel1

      Hello.

      How can I create special components in a library, such as NC, gnd, etc? To be more exactly, symbols for "gnd" and "vcc" were as builins in a library, but NC needs to be created.,

      Thanks a lot,

      Ekaterina

        • 1. Re: Creating Special components
          MENTOR_Shannonk

          I'm not exactly sure if you are asking how to build the symbols or how to add them to the Special Components menu.

           

          TechNote mg527127 shows how to build a term (aka NC) symbol. 

          TechNote mg520126 shows how to add symbols to the Special Components menu.

           

          If you are not on Support you can find the Term Symbol process explained in the DxDesigner Symbol Editor manual and the Special Componets addition is detailed in the DxDesigner User's manual.

           

          There is a sample term symbol in the builtin partition of the Sample lib in the Mentor Install. $SDD_HOME\standard\examples\SampleLib2007\SampleLib.lmc

          • 2. Re: Creating Special components
            robert_davies

            If you look in the Sample Library builtin partition there is a No Connect symbol called 'Term' you can either use this as is or use it as a basis for your own (install path \SDD_HOME\standard\examples\SampleLib2007). This is also documented in the DxDesigner Symbol Editor manual shipped with the documentation set in the section:

             

            Managing Symbols

            > Creating a No Connect (Terminator) Symbol

             

            These 'no connect' symols have a specific use as indicated in the DxDesigner User's Guide section:

             

            Building a Schematic

            >

            Component Connections in a Schematic

            >

            Connectivity Editing

            > Preventing Errors for Unconnected Symbol Pins and Dangling Nets (Net Stubs)

             

             

            They are used to terminate net stubs on unused pins in your symbol graphic (see attached), and they prevent certain warnings in DRC and single pin net reports in the packager. They should not be used through hierarchy or on power supply nets such as VCC or GND (Taps) as they prevent the net from being passed to layout.

             

            These should not be confused with the 'no connect' or NC pin types defined in the Part Database (Part Editor) which are used to tag unused pins in a cell.

            • 3. Re: Creating Special components
              rykiel1

              Thanks a lot

              Till this time i`ve never seen NC symbols as "terms", just as a crosses. "Term" is a builtin symbol, but creating it again was a useful experience

              • 4. Re: Creating Special components
                robert_davies

                If this question is now answered to your satisfaction please mark it as 'Answered' either by clicking one of the posts as the Correct Answer or selecting the 'Mark Assumed Answered' in your original question. This way the Community becomes more valuable to other users seeking answers.