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Hierarchical Parasitic Extraction & Cadence Tools

jimito13

Hello Everyone,

I have come up with a question and i would really want to hear the opinion of more expert people in here about my issue concerning parasitic extraction in an hierarchical design.So,let me pose my question more clearly :

I have an hierarcical design.Let's say that the top level schematic's name is A.

A consists of two sub-cells that i will give them the name B1,B2.

B1 has 6 more sub-cells (C1,C2,C3,C4,C5,C6).

I know hot to perform hierarchical RCX with the Hierarchy Editor tool of Cadence but...if i want to take into account the parasitics of the interconnections of some specific sub-cells what is the way to implement the extraction procedure and take correct results?Can Hierarchy Editor do this or i need another tool of cadence and subsequently an extra license for this?

A testbench for me in the hierarchy editor would be :

A -->Schematic

B1 -->Schematic

C1,C2,C3,C4 -->Schematic

C5,C6 --> av_extracted

B2 -->av_extracted

and i want to extract as well the interconnections between C5-C6 cells and between B1-B2 cells.I should note that all sub-cells have their own physical implementation (layout view in other words).

Thanks in advance for any helpful answer.

My Best Regards,

Jimito13

 

Parents

  • Hi Jimito13

    You can enter the names in a file if there are lots of cells to preserve. It would be easier editing a file. E.g. for spef/dspf flow, we can use SKILL to grap cellnames from the layout, dump them into a file and then use that file for ?preserveCells. If there are just a few cells to preserve, you can just enter them in the form.

    It is possible to do the selective extraction of RC for a net but it would be quite an elaborate scheme that requires re-compilation of QRC tech directory with -res_blocking and -blocking options. Appropriate marker layers would most likely also have to be added to the layout in order to do the blocking. I think it is not really worth the effort. : )

    Best regards
    Quek

Reply

  • Hi Jimito13

    You can enter the names in a file if there are lots of cells to preserve. It would be easier editing a file. E.g. for spef/dspf flow, we can use SKILL to grap cellnames from the layout, dump them into a file and then use that file for ?preserveCells. If there are just a few cells to preserve, you can just enter them in the form.

    It is possible to do the selective extraction of RC for a net but it would be quite an elaborate scheme that requires re-compilation of QRC tech directory with -res_blocking and -blocking options. Appropriate marker layers would most likely also have to be added to the layout in order to do the blocking. I think it is not really worth the effort. : )

    Best regards
    Quek

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