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 ECO and Incremental route 

Last post Wed, Aug 2 2006 6:10 AM by archive. 1 replies.
Started by archive 02 Aug 2006 06:10 AM. Topic has 1 replies and 1626 views
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  • Wed, Aug 2 2006 6:10 AM

    • archive
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    ECO and Incremental route Reply

    Any help would be appreciated.

    I do ECO (to place a few cells into an already placed and routed design). If I now un-check fix pre-placed cells and do incremental Final route (with Redo Global Route for violations checked) will Silicon Ensemble automatically re-adjust the nets coming into and outof the cells that were moved, to accomodate for the new cells. 

    Is there a marked difference if instead I choose to SET VAR QPLACE.FIX.PLACED.CELL "TRUE";


    ....and what is the significance of the following message

    "WROUTE: Netlists are mismatching between SE database and wroute database."


    Originally posted in cdnusers.org by kdurais
    • Post Points: 0
  • Wed, Aug 2 2006 6:57 PM

    • archive
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    • Joined on Fri, Jul 4 2008
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    RE: ECO and Incremental route Reply

    Hello ,

    you can use "ecoPlace -fixPlacedInsts " option to don`t move the instances which was already placed.
    How ever when "-fixPlacedInsts " option is not specified in order to place unplaced cell in the optimal position , the instances which was already placed and has PLACED status may move .
    to Route nets which were changed by ECO use
    encounter > setnanoRouteMode routeWithECO tru
    encounter > globalDetailRoute
    When the variable "routeWithECO true " is set , only nets with differs its wire connection and net connection are rerouted.
    If routing doesn`t complete with "routeWithECO true " option , then route with "routeWithECO false " in this case all nets are re-routed ,but the course of the wire which is already routed doesn`t change roughly



    In general Soc can handle 3 types of ECO flow like
    1. Post -layout ECO
    2. post -Mask ECO
    3. Smart ECO

    How ever you have not mentioned which one you are using and flow involved to do it ??

    FYI .

    As we know the procedure will generate use ecoCompareNetlist and loadECO commands .
    ecoDefIn :
    Restores physical information from an old design and compares this
    information with the design in memory. This command uses the specified
    DEF file
    - New cells and nets

    Cells and nets that exist in memory but not in the DEF file become
    unplaced.

    - Deleted cells or nets

    Cells and nets that exist in the DEF file but not in memory are dis-
    carded.

    - Modified nets

    Nets found both in the DEF file and in memory, but whose connections
    are different, are marked as "modified" for further processing during
    ecoRoute.

    - Matched cells/nets

    Nets and cells that exist both in the DEF file and in memory, and have
    the same connections, are placed as described in the DEF file. This
    includes the soft matching capability used in defIn.
    - In post-mask mode (with the -postMask parameter), the software can
    only change nets, not cells. This command behaves as follows:

    - New added cells and nets

    Cells and nets that exist in memory but not in the DEF file become
    unplaced. Later, these cells but will be mapped to spare cells when you
    use ecoPlace -useSpareCells.

    - Deleted cells

    Cells and instances that exist in DEF but not in memory are added to a
    spare cell list in Encounter: They are not discarded. Deleted cells are
    renamed with their original name and the suffix you specify. The
    default suffix is _SPARE. For example, cellA is renamed cellA_SPARE.
    The software retains deleted nets and their routing, which ecoRoute
    reroutes later.

    - Deleted nets

    Nets that exist in DEF but not in memory are kept and processed later
    when you use the ecoRoute command.

    - Modified nets

    Same behavior as in the pre-mask mode.

    - Matched cells and nets

    Same behavior as in the pre-mask mode.

    - Physical cells

    Cells that exist in the DEF file but not in memory, which are marked
    with +SOURCE DIST in the DEF file, are restored.


    Originally posted in cdnusers.org by mohanch007
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Started by archive at 02 Aug 2006 06:10 AM. Topic has 1 replies.