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Creating instances and naming them in a definite manner using a loop

Sattiwk

Hi,

I am trying to create N instances and name them as xI1, xI2......,xIN using a loop and add them in a list. I have a written code that does the same for 4 instances as shown below (code snippet).

; Create library and cell for the scaled copy
dbCreateLib("__distCalcLib")
x1cp=dbCopyCellView(x1m "__distCalcLib" "__distCalcCell" "symbol")
dbSave(x1cp)
x1cpsch=dbOpenCellViewByType("__distCalcLib" "__distCalcCell" "schematic" "schematic" "w")
dbSave(x1cpsch)

; Have 4 instances(one for OP, three for scaled signals)
; add code-Currently, y spacing is hard coded-modify to determine size and spacing from the size
xI1=schCreateInst(x1cpsch x1m "I1" '(0 0) "R0")
dbCopyProp(x1 xI1)
xI2=schCreateInst(x1cpsch x1m "I2" '(0 5) "R0")
dbCopyProp(x1 xI2)
xI3=schCreateInst(x1cpsch x1m "I3" '(0 10) "R0")
dbCopyProp(x1 xI3)
xI4=schCreateInst(x1cpsch x1m "I4" '(0 15) "R0")
dbCopyProp(x1 xI4)

; One list for the operating point and three for scaled signals
opInstList = cons( xI4 nil )
sigInstList = list( xI1 xI2 xI3 )

-------------------------------------------------------------------------------------------

I tried to write a code to achieve my goal.This is my effort.

-------------------------------------------------------------------------------------------

; Have N instances

numCopies=4

counter=1
instanceIndex='()
opInstList='()
sigInstList='()
while(counter <= numCopies
ySpace=5*counter-5
instanceIndex =append(instanceIndex schCreateInst(x1cpsch x1m sprintf(nil, "xI%d" counter) '(0 ySpace) "R0"))
dbCopyProp(x1 instanceIndex[counter-1])
if(counter==numCopies then
opInstList =cons(nth(counter-1 instanceIndex) opInstList)
else
sigInstList =append(sigInstList nth(counter-1 instanceIndex))
)
counter=counter+1
)

---------------------------------------------------------------------------------------------------------------------------------------------------------------

I am not getting the desired output. The lists are empty and no instances are getting created.But the length of the lists are correct but the 'sigInstList' shows (nil,nil,nil) for N=4.

I am new to skill programming, so I couldn't figure out how to fix this and am seeking for help. Also, before creating the library, I want to add a code to check whether the library of same name exists or not and if it exists, it must be deleted.

I just want to automate the first code for N instances. Please help me out.

I am using cadence version IC6.1.7-64b.500.3.

Parents

  • Hi,

    Your function schCreateInst(...) goes wrong - reason is that you pass the instance's origin (the 4th argument of schCreateInst() as a quoted list: '(0 ySpace)
    That way ypSpace is not turned into a value but remains a symbol. As a result schCreateInst() fails..silently unfortunately... and returns nil.

    Use (list 0 ySpace) instead and you should be ok.

    Max

  • in reply to mbracht

    Thanks mbracht, it worked fine. Can you explain when to use quoted list and when not to? What is the difference between the two? I just want to know so that I don't make similar mistakes in the future. Thank you for your time.

  • in reply to Sattiwk

    A qoted list silently applies the quote to each and every element in the list. And applying a quote to a symbol prevents it from being evaluated as a SKILL expression,- in your specific example ySpace.

    ySpace = 5.0
    (list 0 ySpace) ---> (0  5.0)
    '(0 ySpace)     ---> (0 ySpace)

    So in case of the quoted list you get back the SKILL symbol.
    You should make yourself familiar with the concept of symbols - they are really crucial in SKILL. A symbol in SKILL is essentially just a name that can be used (potentially simultanously) for a variable, a function or a property list.

    regards
    Max

Reply
  • in reply to Sattiwk

    A qoted list silently applies the quote to each and every element in the list. And applying a quote to a symbol prevents it from being evaluated as a SKILL expression,- in your specific example ySpace.

    ySpace = 5.0
    (list 0 ySpace) ---> (0  5.0)
    '(0 ySpace)     ---> (0 ySpace)

    So in case of the quoted list you get back the SKILL symbol.
    You should make yourself familiar with the concept of symbols - they are really crucial in SKILL. A symbol in SKILL is essentially just a name that can be used (potentially simultanously) for a variable, a function or a property list.

    regards
    Max

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