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Metal density/ Density check

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Hi All,

Please can anybody give me the information about Metal density/ Density check.

Thanks in advance.


Originally posted in cdnusers.org by mahecadence
Parents

  • Hi -

    What are you looking for ? The question is very generic and is technology dependent.

    Density requirements and checks are becoming more tedious with the smaller technolgies.

    Step 1 - Add Metal Fill. Use the addMetalFill command.
    addMetalFill -layer {METAL LAYERS} {AREA TO INSERT FILL} -timingaware on

    Be aware of active spacing etc.

    Parameters to fill this can be set using -
    setMetalFill

    Check timing , trim metal if required.

    Step 2 -
    I have used the ADDFILL command to insert the standard cell FILL cells. I do it in two steps because it inserts too many instances of the smaller FILL cells. So do the bigger ones first and the smaller cells.

    ADDFILL -prefix {PREFIX} {LIST OF FILLER CELLS}

    Step 3 - verifyMetalDensity -layers {METAL LAYERS} -area {AREA to be verified}

    Our final checks are done outside in another tool.

    Dont know if this helps.

    Sanjay Sunder






    Originally posted in cdnusers.org by ssunder@sioptical.com
Reply

  • Hi -

    What are you looking for ? The question is very generic and is technology dependent.

    Density requirements and checks are becoming more tedious with the smaller technolgies.

    Step 1 - Add Metal Fill. Use the addMetalFill command.
    addMetalFill -layer {METAL LAYERS} {AREA TO INSERT FILL} -timingaware on

    Be aware of active spacing etc.

    Parameters to fill this can be set using -
    setMetalFill

    Check timing , trim metal if required.

    Step 2 -
    I have used the ADDFILL command to insert the standard cell FILL cells. I do it in two steps because it inserts too many instances of the smaller FILL cells. So do the bigger ones first and the smaller cells.

    ADDFILL -prefix {PREFIX} {LIST OF FILLER CELLS}

    Step 3 - verifyMetalDensity -layers {METAL LAYERS} -area {AREA to be verified}

    Our final checks are done outside in another tool.

    Dont know if this helps.

    Sanjay Sunder






    Originally posted in cdnusers.org by ssunder@sioptical.com
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