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Can I generate layout from source but not from the same hierarchy level?

delgsy

Let's say I have this hierarchy in the schematic:
TOP
|--I1
|   |--M1, M2, I3
|
|--I2
    |--M1, M2, M3, I4

So, I1 and I2 are on the same hierarchy level.

I do not want to create the layout of I1 and I2.
what I want is creating the layout of TOP by instantiating M1, M2, I3 from I1 and M1, M2, M3, I4 from I2.
Is it possible?
if yes, how to manage the hierarchy so it pass the LVS.

In TOP layout, I am aware I can instantiate any cell layout, but I am not sure how to manage the hierarchy and how to instantiate devices, e.g., M, R, C.

Parents
  • Changyou Fan

    Yes you can achieve that by following these steps:

    1. In layout window, Launch->Configure Physical Hierarchy 

    2. In the pop-up form, select "Hierarchy Configuration" (by default), In the tab of "instances", click on I1

    3. RMB->set/remove force descend

    4. Do the same to I2.

    5. Save and quit this form

    6. Run Generate From Source

  • delgsy
    in reply to Changyou Fan

    I finish until step5.
    Then, in the layout, I click "Generate Selected from Source", go down 1 hierarchy to I1 and I2 level (EDIT: in the schematic), choose I3.
    But this does not generate layout of I3 which is available actually.

    did I miss anything?

  • Changyou Fan
    in reply to delgsy

    Are the other instances (M1/M2/M3/I4) generated in the layout as expected or not? Is the layout cell of I3 in a different library?

  • delgsy
    in reply to Changyou Fan

    I have just checked it that if I click "Generate Selected from Source", then choose I1, all the components inside I1, i.e., M1, M2, I3, are generated.

    I am expecting that I can instantiate only I3 because what I need to do is integrating I3 layout to the existing layout consisting M1 and M2.
    But if it is not possible, it is ok. I can just delete the new instantiated layout of M1 and M2.

    Thank you once again!

Reply
  • delgsy
    in reply to Changyou Fan

    I have just checked it that if I click "Generate Selected from Source", then choose I1, all the components inside I1, i.e., M1, M2, I3, are generated.

    I am expecting that I can instantiate only I3 because what I need to do is integrating I3 layout to the existing layout consisting M1 and M2.
    But if it is not possible, it is ok. I can just delete the new instantiated layout of M1 and M2.

    Thank you once again!

Children
  • Changyou Fan
    in reply to delgsy

    That's also possible. In the Configure Physical Hierarchy form, select M1, then in Attributes->Ignore For Generation, set the value to "true". Do the same to M2, save and exit. Run Generate From Source again. Thanks!

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