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Innovus instance groups with multiple regions

jeffreyprinziekul

Hi all,

I have a specific question regarding instance groups and their placement. What I want to achieve is to add multiple instances to a instance group and then allow these instances to be places, distributed across different regions. I can only create an instance group with one rectangular region but I need to allow the tool to most efficiently place the cells of an instance group allowing multiple regions.

In general, I will have 2 instance groups, eg. grpA and grpB. Each group can have a lot of instances

A typical placement strategy will be as follows. All cells of grpA can be placed in any of the different GRPA regions. It is up to innovus to decide which place is optimal in terms of timing and routing.

Is it possible with to achieve this, either with instance groups or any other method? I've been think about placing blockages as an inverse of the placement guides but I tend to end up with the same problem that I cannot find how multiple regions can be applied to a single group of cells.

I am of course open to reorganizing the groups etc.

Thanks for your input!

Jeffrey

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  • in reply to Chetan B S

    Thanks,

    But createInstance group does not allow different "islands" which are unconnected. Moreover, if you create eg 2 inst groups, an instance cannot be part of both instgroups at the same time. What I really want to do is to have a repeating pattern of GroupA, GroupB, GroupC, add an instance to group A and have the placement tool decide where exactly to place it.

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