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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,

    Each cellView that you're picking in the hierarchy editor will have nets and components as contained in that cellView. So for example, if your av_extracted view has parasitic R and C on some nets, those will be included in the design being netlisted.

    Nothing additional will get invented, if you like. You simply are netlisting the components and connectivity in the cellViews you've picked. 

    So, any ideal blocks you have will be ideal. Any parasitic extracted blocks you have will have parasitics. This strikes me as being rather obvious, so I'm not quite sure why you're asking this? All the hierarchy editor does is allow you to choose which representations will be used for each cell, or instance (or occurrence) in the hierarchy, and is used by the netlisters so they know which blocks to netlist as the hierarchy is traversed.

    Regards,

    Andrew.

Reply

  •  Hi Jimito13,

    Each cellView that you're picking in the hierarchy editor will have nets and components as contained in that cellView. So for example, if your av_extracted view has parasitic R and C on some nets, those will be included in the design being netlisted.

    Nothing additional will get invented, if you like. You simply are netlisting the components and connectivity in the cellViews you've picked. 

    So, any ideal blocks you have will be ideal. Any parasitic extracted blocks you have will have parasitics. This strikes me as being rather obvious, so I'm not quite sure why you're asking this? All the hierarchy editor does is allow you to choose which representations will be used for each cell, or instance (or occurrence) in the hierarchy, and is used by the netlisters so they know which blocks to netlist as the hierarchy is traversed.

    Regards,

    Andrew.

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