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Forums > Digital IC > Floorplanning, Place and route

Subject: Why encounter places std cells on macro?
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pico
Posts: 8
Online: User is Offline
7/01/2008 4:02 AM  
I am totally confused with this behavior.
Do I have to add placement blockage on macros? My version is 5.2.

If so , how to ?
I can only find Place->Specify->Placement Blockage but this is not what I want.

Thank you.
BobD
Posts: 80
Online: User is Offline
7/07/2008 9:56 AM  
Assuming you're accepting the placement default settings (ie, not running placement in "floorplanning" mode) the only scenario I can think of where it would be acceptable for the tool to place standard cells upon a hard macro is if the hard macro has a cutout defined. You could check to see whether this is the case by checking for an OVERLAP statement in the hard macro's LEF file, but the tool should be displaying any rectilinear hard macros such that any cutouts are visible so that doesn't seem like a likely cause here.

Otherwise, it sounds like a bug of some sort. You should not have to Place->Specify->Placement Blockage to prohibit standard cells from being placed upon hard macros.

Perhaps you can describe the flow you're using in terms of whether hard macros are FIXED prior to running standard cell placement, or whether you're running concurrent standard cell and hard macro placement. There might be some sequence of events that are tripping the tool up.

Thanks,
Bob
pico
Posts: 8
Online: User is Offline
7/13/2008 4:59 AM  
Bob,

I am sorry for my late reply to this topic.
I find out the reason why soce has this strange behavior as I added fixed attrbute to these std cells unintentionally.
I thought some GUI operation added this attribute.
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Forums > Digital IC > Floorplanning, Place and route > Why encounter places std cells on macro?


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