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 relative placement with macros 

Last post Tue, Apr 9 2013 3:35 AM by kasyab. 0 replies.
Started by kasyab 09 Apr 2013 03:35 AM. Topic has 0 replies and 541 views
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  • Tue, Apr 9 2013 3:35 AM

    • kasyab
    • Top 500 Contributor
    • Joined on Sat, Mar 13 2010
    • Posts 22
    • Points 305
    relative placement with macros Reply


      I am trying to place a design with some macros and I use relative placement for these. Since the design is fairly large and only one (shared) 4 core machine is available I try not to use the GUI to do this. In my script file to carry out the relative placement I perform the following steps:

    1) Adjust the floorplan with the floorPlan command. I use a relative floorplan with an aspect ratio of 1.1 and 50% density.

    2) Read the co-ordinates of the new floorplan using the dbGet commands.

    3) Relatively place the macros using " relativeFPlan --place <instance> <reference_coordinates> <offset_coordinates> <orientation> "

    4) Create obstructions using "createObstruct -name <NAME> -box <coordinates>" after calculating the required coordinates.

    5)  Select the placed macros and use cutRow -selected -halo <spacing>.

    6) Place other instances in the design hierarchy using createRegion and createGuide.

    After each of the numbered steps I run deselectAll followed by redraw to ensure that none of the previously selected instances foul up following calculations. 

    Here's my problem: the first time I run this script (with or without the GUI) the obstructions are not created correctly and a number of these warnings are issued:

    " **WARN: (ENCSYC-6130):    Warning: The X coordinate of lower left corner is greater than upper right. We will exchange them."

    When I run the script a second time (after deleting the obstructions), the run complains about HInst constraints being outside the die (fair enough, since I don't actually delete the relativeFPlan) and then warnings about HInsts having constraints on them already and overriding them (again, fair enough). But this time I get the floorplan I want.

    Am I missing something in my script? Why do I have to run the script twice to get the floorplan I want?

    I am not able to attach pictures which would give you a better idea of what I am trying to get at.

    Any help is appreciated.



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Started by kasyab at 09 Apr 2013 03:35 AM. Topic has 0 replies.