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How to save the cellview of all instances in a top cell faster?

GGLin

I have a top cell & need to revise all the instances' cellview & export top cell as a new GDS file.

So I write a SKILL code to do so and I find out it will be a little bit slow by using the dbSave to save the cellview of each instance.

Code as below:

let( (topCV subCV )
topCV = dbOpenCellViewByType(newLibName topCellName "layout" "maskLayout" "a")
foreach(inst topCV->instances
subCV = dbOpenCellViewByType(newLibName inst->cellName "layout" "maskLayout" "a")
;;;revise code content
;;;...
;;;revise code content
dbSave(subCV)
dbClose(subCV)
)
dbSave(topCV)
dbClose(topCV)
system(strcat( "strmout -library " newLibName " -topCell " topCellName " -view layout -strmFile " resultFolder "/" topCellName ".gds -techLib " srcLibName " -enableColoring -logFile " topCellName "_strmOut.log" ) )
)

Even if the cell content is not revised, the run time of dbSave will be 2 minutes when there are ~ 1000 instances in topcell. The exported GDS file size is ~2MB.

And the dbSave becomes the bottle neck of the code runtime...

Is there any better way to do such a thing? 

  • Andrew Beckett

    If you have multiple instances of any cell, you'll be doing the work more than once for each sub-cell. Also, you may be trying to modify any PCell variant too, which really doesn't make any sense.

    So perhaps you should do:

    foreach(subCV topCV~>instanceMasters
       ; no need to re-open as you've already got the master
       unless(subCV~>superMaster ; i.e. if this is a variant of a PCell
         ;;; revise content
         dbSave(subCV)
         ;; don't close, because you didn't open the master
       )
    )

    If that doesn't help, this will almost certainly just be because you've got a lot of data to save - that's probably then unavoidable. If you really don't need to save the data to disk, you could use the xstSetField("virtualMemory" "true") and other xstSetField calls to define the top cell, file name and so on, and then xstOutDoTranslate() to do the stream out from memory.

    Andrew

  • GGLin
    in reply to Andrew Beckett

    Thanks for the quick reply, I'll try it.

  • GGLin
    in reply to Andrew Beckett

    Sorry 1 more question.

    After call the xstOutDoTranslate(), there will be a message window shows the streamout is done.

    Is there any way to not show or close this window by SKILL code?

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