Home > Community > Forums > Digital Implementation > To avoid overlap of metals in different layers

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: *

 To avoid overlap of metals in different layers 

Last post Fri, Oct 22 2010 9:12 AM by Kari. 5 replies.
Started by surajece01 19 Oct 2010 11:27 PM. Topic has 5 replies and 2050 views
Page 1 of 1 (6 items)
Sort Posts:
  • Tue, Oct 19 2010 11:27 PM

    To avoid overlap of metals in different layers Reply

    Hi,

    Can any body tell me if there is any option to route a net without overlapping with metals in different layers.

    Thanks

    suraj 

     

     

    • Post Points: 20
  • Wed, Oct 20 2010 12:26 PM

    • Kari
    • Top 10 Contributor
    • Joined on Tue, Jul 15 2008
    • Cary, NC
    • Posts 690
    • Points 13,980
    Re: To avoid overlap of metals in different layers Reply

     I can't think of a quick or easy way to do this... can you say why you want to do this? Maybe knowing the end goal will lead us to find a different solution.

    • Post Points: 20
  • Thu, Oct 21 2010 7:12 AM

    Re: To avoid overlap of metals in different layers Reply

    I have observed that in my design iam getting more coupling capacitance in case of when different metal routing overlaps than the routing in same metal layers placed closely. I tried to do fix these problem by manually clearing the overlap. it is a tedious task. I was wondering if there is any smart way of doing this.

    P.S. It is one of the signoff checks that coupling cap should not exceed a particular threshold value.. 

    • Post Points: 20
  • Thu, Oct 21 2010 7:25 AM

    • Kari
    • Top 10 Contributor
    • Joined on Tue, Jul 15 2008
    • Cary, NC
    • Posts 690
    • Points 13,980
    Re: To avoid overlap of metals in different layers Reply

     Are you setting nanoRoute to avoid SI issues?

    setNanoRouteMode -routeWithSIDriven true

    setNanoRouteMode -routeSIEffort high

    • Post Points: 20
  • Fri, Oct 22 2010 6:20 AM

    Re: To avoid overlap of metals in different layers Reply

    Hi Kari,

    Thanks kari for the response,

    I have already tried the above options they doesnt seem to work. They dont see the si effect due to metals in different layers.

    I need a option which would help me in rerouting the net without overlap with other metals.

    Thanks

    suraj

     

     

     

     

    • Post Points: 20
  • Fri, Oct 22 2010 9:12 AM

    • Kari
    • Top 10 Contributor
    • Joined on Tue, Jul 15 2008
    • Cary, NC
    • Posts 690
    • Points 13,980
    Re: To avoid overlap of metals in different layers Reply

     I think then the next plan of attack should be to use the Mixed Signal router on these nets, so you can take advantage of coax shielding. Check out the chapter in the EDI System User Guide called "Using the Encounter Mixed Signal Router", specifically the section on Specialized Routing Techniques/Shielded Nets - look for coaxial shielding. Let us know how this works for you!

    - Kari

    • Post Points: 5
Page 1 of 1 (6 items)
Sort Posts:
Started by surajece01 at 19 Oct 2010 11:27 PM. Topic has 5 replies.