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Hierarchy editor - Implication of "stop point" on netlist

tito80

Hi, I am using Virtuoso hierarchy editor (config view) in IC6.1.5. As per the documentation, I am setting stop point on a particular instance so that the netlister does not desced further into that instance's schematic hierarchically. But I am seeing no change in the netlist produced with that config. For e.g., it was earlier:

subckt subckt_A

...

ends sunckt_A 

I1 (n1 n2) subckt_A

And after putting stop point on I1, it is still the same. So what does the "stop point" actually do? 

 

Parents

  • Andrew,

    Thanks for the help. My responses would be:

    1)  Yes, I did ensure that config view for the top_design is used.

    2) Note that I am trying to do it on an instance basis -- say instance 'my_inst' of subckt definition 'my_subckt'. Cadence HE UG says: "You can specify a stop point on a single instantiation of a cell that prevents the instance from being expanded when the hierarchy is expanded.". So I have absolutely no problem if my_subckt gets expanded (to cater to other instances), but 'my_inst' should probably not point to that my_subct any more. 

    3) As per your advice, I tried the stop-point on a cell-basis keeping everything else undisturbed (viewnames to be used, etc.). But there, I face this error:

    Netlist Error: Cannot find any info on instance "my_inst" in cell-view "my_lib" "parent_cell_of_my_inst" "schematic"

    Netlist Error: Some cell-views used inside this block could not be netlisted in analog context

    Look forward to your help.

    - Tito 

     

     

Reply

  • Andrew,

    Thanks for the help. My responses would be:

    1)  Yes, I did ensure that config view for the top_design is used.

    2) Note that I am trying to do it on an instance basis -- say instance 'my_inst' of subckt definition 'my_subckt'. Cadence HE UG says: "You can specify a stop point on a single instantiation of a cell that prevents the instance from being expanded when the hierarchy is expanded.". So I have absolutely no problem if my_subckt gets expanded (to cater to other instances), but 'my_inst' should probably not point to that my_subct any more. 

    3) As per your advice, I tried the stop-point on a cell-basis keeping everything else undisturbed (viewnames to be used, etc.). But there, I face this error:

    Netlist Error: Cannot find any info on instance "my_inst" in cell-view "my_lib" "parent_cell_of_my_inst" "schematic"

    Netlist Error: Some cell-views used inside this block could not be netlisted in analog context

    Look forward to your help.

    - Tito 

     

     

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