Home > Community > Forums > Digital Implementation > Physical cell positions in layout

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: *

 Physical cell positions in layout 

Last post Thu, Apr 24 2008 10:01 AM by archive. 5 replies.
Started by archive 24 Apr 2008 10:01 AM. Topic has 5 replies and 1463 views
Page 1 of 1 (6 items)
Sort Posts:
  • Thu, Apr 24 2008 10:01 AM

    • archive
    • Top 75 Contributor
    • Joined on Fri, Jul 4 2008
    • Posts 88
    • Points 4,930
    Physical cell positions in layout Reply

    Hi everyone, can anyone plz tell me how can I extract physical gate positions on chip from its layout. I am very new 2 Cadence. So if very briefy u could plz write me how can i go from VHDL code 2 abstract layout (contains gate positions only). regards Touqeer


    Originally posted in cdnusers.org by touqeerazam
    • Post Points: 0
  • Thu, Apr 24 2008 10:13 AM

    • archive
    • Top 75 Contributor
    • Joined on Fri, Jul 4 2008
    • Posts 88
    • Points 4,930
    RE: Physical cell positions in layout Reply

    If the chip is implemented flatten, you can try those:
    -- export a def file, (file->Export->DEF), then, from the def file, the "COMPONENTS" section will give you locations for all the instances.
    -- inside Virtuso layout editor, the "Edit->Search" will let you search instances by their name, and then, select them, and query their location.
    -- If you have Virtuoso VXL, you can do schematic--layout cross probe.
    If there are physical hierarchy, you have to look into individual layout view and convert their (x y) into top level when needed.

    Tongju


    Originally posted in cdnusers.org by Tongju
    • Post Points: 0
  • Thu, Apr 24 2008 10:26 AM

    • archive
    • Top 75 Contributor
    • Joined on Fri, Jul 4 2008
    • Posts 88
    • Points 4,930
    RE: Physical cell positions in layout Reply

    Thanks Tongju,

    I am sure this will be useful. I am working on SSTA implementation; and my tool needs to be feed with physical cell positions for timing analysis. Is it possible to genearate any file (netlist) which contains phyiscal gate locations and my scripts can then read this file for timing? I need to add automation to this timing flow so manual selection will not be feasible.

    Best regards
    Touqeer


    Originally posted in cdnusers.org by touqeerazam
    • Post Points: 0
  • Thu, Apr 24 2008 11:51 AM

    • archive
    • Top 75 Contributor
    • Joined on Fri, Jul 4 2008
    • Posts 88
    • Points 4,930
    RE: Physical cell positions in layout Reply

    Does exporting a DEF file help? Another way is to write a skill program to print out the instance locations, like:

    cvid=geGetEditCellView
    foreach(inst cvid~>instances
    printf("%s %L\n" inst~>name inst~>xy)
    )

    Tongju


    Originally posted in cdnusers.org by Tongju
    • Post Points: 0
  • Thu, Apr 24 2008 9:04 PM

    • archive
    • Top 75 Contributor
    • Joined on Fri, Jul 4 2008
    • Posts 88
    • Points 4,930
    RE: Physical cell positions in layout Reply

    Posted By Tongju on 4/24/2008 11:51 AM
    Does exporting a DEF file help? Another way is to write a skill program to print out the instance locations, like:

    cvid=geGetEditCellView
    foreach(inst cvid~>instances
    printf("%s %L\n" inst~>name inst~>xy)
    )

    Tongju
    Tongju, I think he needs to tailor your SKILL script to output the format that his SSTA tool can read. That SSTA tool does a location based OCV.


    Originally posted in cdnusers.org by eminemshow
    • Post Points: 0
  • Fri, Apr 25 2008 3:54 AM

    • archive
    • Top 75 Contributor
    • Joined on Fri, Jul 4 2008
    • Posts 88
    • Points 4,930
    RE: Physical cell positions in layout Reply

    You can also try using dbInstLoc command.

    set instptr [dbGetInstByName ]
    dbInstLoc $instptr


    Originally posted in cdnusers.org by abhiroy03
    • Post Points: 0
Page 1 of 1 (6 items)
Sort Posts:
Started by archive at 24 Apr 2008 10:01 AM. Topic has 5 replies.