Home > Community > Forums > PCB Design > Instance vs. occurrence

Email

* Required Fields

Recipients email * (separate multiple addresses with commas)

Your name *

Your email *

Message *

Contact Us

* Required Fields
First Name *

Last Name *

Email *

Company / Institution *

Comments: *

 Instance vs. occurrence 

Last post Tue, May 7 2013 2:10 AM by tltoth. 7 replies.
Started by tltoth 21 Apr 2013 11:49 PM. Topic has 7 replies and 2242 views
Page 1 of 1 (8 items)
Sort Posts:
  • Sun, Apr 21 2013 11:49 PM

    • tltoth
    • Top 50 Contributor
    • Joined on Fri, Aug 29 2008
    • Miskolc, Hungary
    • Posts 188
    • Points 2,815
    Instance vs. occurrence Reply

    Hi,

    Could someone please explain the difference between instance and occurrence property with an example?

    Thanks!

    • Post Points: 20
  • Mon, Apr 22 2013 2:40 AM

    • kabalee
    • Top 50 Contributor
    • Joined on Wed, Oct 7 2009
    • Trichy, Tamil Nadu
    • Posts 139
    • Points 2,495
    Re: Instance vs. occurrence Reply
    instance property-for annotation instance property is a default. Occurrence property-you should not choose this because the annotation will not done properly.
    kabee
    • Post Points: 5
  • Mon, Apr 22 2013 2:48 AM

    • kabalee
    • Top 50 Contributor
    • Joined on Wed, Oct 7 2009
    • Trichy, Tamil Nadu
    • Posts 139
    • Points 2,495
    Re: Instance vs. occurrence Reply
    • Post Points: 20
  • Tue, Apr 23 2013 12:13 AM

    • tltoth
    • Top 50 Contributor
    • Joined on Fri, Aug 29 2008
    • Miskolc, Hungary
    • Posts 188
    • Points 2,815
    Re: Instance vs. occurrence Reply

    Thank you for you answer kabee.

    It is not still clear for me why it is useful to have different properties for a placed part called instance or occurrence. The Capture user guide gives also a blurred explanation on the topic like "the information "shines through"from the cache to the instance and occurences of the part property". It is resonable that different parts from different projects have different properties and these differences should be handled somehow. But would it be more beneficial to decide at the placement of the copied part which property is required and which is not. On the other hand what indicates that you are in occurance or instance mode? 

    Could someone shed some ligth on it?

    TL

     

    • Post Points: 20
  • Sat, May 4 2013 4:37 AM

    • luvishis
    • Top 150 Contributor
    • Joined on Sat, Feb 28 2009
    • Posts 53
    • Points 505
    Re: Instance vs. occurrence Reply

     Hi

    For a flat design there is no much differences. Occurrences can be used to store backannotation information that overrides properties on an instance.

    For a complex hierarchy design you can have an instance present on one schematic page, that can have different RefDes depending of the hierarchical path. For situations like this you need Occurrences that are unique in hierarchy while instance might not be unique.

    Hope this helps.

     

    • Post Points: 20
  • Mon, May 6 2013 5:50 AM

    • tltoth
    • Top 50 Contributor
    • Joined on Fri, Aug 29 2008
    • Miskolc, Hungary
    • Posts 188
    • Points 2,815
    Re: Instance vs. occurrence Reply

    Thank you!

     

    • Post Points: 20
  • Tue, May 7 2013 1:46 AM

    • steve
    • Top 10 Contributor
    • Joined on Fri, Jul 18 2008
    • Woking, Surrey
    • Posts 1,163
    • Points 18,900
    Re: Instance vs. occurrence Reply
    • Post Points: 20
  • Tue, May 7 2013 2:10 AM

    • tltoth
    • Top 50 Contributor
    • Joined on Fri, Aug 29 2008
    • Miskolc, Hungary
    • Posts 188
    • Points 2,815
    Re: Instance vs. occurrence Reply

    Thank you Steve!

    That's what I was looking for!

    • Post Points: 5
Page 1 of 1 (8 items)
Sort Posts:
Started by tltoth at 21 Apr 2013 11:49 PM. Topic has 7 replies.