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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,

    You should learn how to use foreach(mapcar ...) functionality. See example :

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

; Have 4 instances(one for OP, three for scaled signals)

ns=linRg(0 3 1);=> (0 1 2 3)
xys  =foreach(mapcar n ns list(0 n*5));=> ((0 0) (0 5) (0 10) (0 15))
insts=foreach(mapcar xy xys schCreateInst(cv x1m "I4" xy "R0"));=> (db:... db:... db:... db:...)
returned=foreach(mapcar inst insts dbCopyProp(x1 inst))

    Considering the declaration of a list. When you manually declare a list, you can use quote.

    Myvar='(1 "a" 3) ;=> element in the list are not evaluated

    when you compute a list, you should use list(1 "a" 3)

    Hope it helps

  • in reply to ebecheto

    good point!

    I think it'd be even more important to check the return value of schCreateInst() in the first place and indicate at least a warning in CIW or maybe even throw an exception. Just seeing a nil as an element in the list returned by (foreach mapcar...) makes it difficult to relate that to the instance that failed to be placed.

Reply
  • in reply to ebecheto

    good point!

    I think it'd be even more important to check the return value of schCreateInst() in the first place and indicate at least a warning in CIW or maybe even throw an exception. Just seeing a nil as an element in the list returned by (foreach mapcar...) makes it difficult to relate that to the instance that failed to be placed.

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