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How to pass parameters to sub-hierarchy cells with calculation

weihai
How to pass parameters to sub-hierarchy cells with calculation (e.g., Length = Length - 0.5 as below, which will flag as error)
The codes can't work when adding "Length = Length - 0.5" but work well if removing the calculation line. why?
Thanks a lot!
 
; Default Parameters
(
   (Length  string  "1.0")
)
 
......
 

;get parameter value from the user interface
    Length = evalstring(car(exists(prop pcParameters ((prop->name)=="Length")))->value)
 
;calculate new Length based on input
    Length = Length - 0.5
 
;Build parameter list for instantiation
 
   paramList = list(
 list("Length"  "string"  Length)
 )
 
    ;Open sublevel device/structure
    nfet_c_Inst = dbOpenCellView(pcLib "nfet_c" "layout")
 
    ;Place initial subInst
    nfet_c = dbCreateParamInst(pcCV nfet_c_Inst nil 0:0 "R0" 1 paramList)

 

  • Huh? This makes no sense at all. Probably not helped by the fact that you've given an incomplete example, so it's hard to follow what you're doing.

    I assume the "; Default Parameters" bit is the formal parameters of a pcDefinePCell call? If so, then within the body of the pcDefinePCell, you can reference the variable Length. There's no need to do that evalstring() line - that seems horribly complicated and unnecessary. Since you've defined the default as a string, you'd want to convert to a float - for example:

    Length=cdfParseFloatString(Length)

    then

    Length=Length=0.5

    and then if you want to create an instance of a sub-pcell then you'd do what you want. 

    You gave no indication of the error you got (so really hard to diagnose). Perhaps the value of Length is out of range? Who knows - I can't guess from no information, unfortunately.

    Regards,

    Andrew.

  • We have found the problem with your help and fixed it with "sprintf".  We need convert the "Length" from float type to string type after the calculation. Thanks.

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