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General about skill scripting

Inas Mohammed

I'm using an if condition for gate routing positioning. The code runs without error but the gates are not placed. so please can you tell me why is this happening? you can find it highlighted in yellow

procedure(place_devices(cellView devLib devCell Length nfunit wfunit DUM1nf DUM1wf DUM2nf DUM2wf yPitch pattern)
let((params array nRows nCols Type dev name nf wf inst devCounts x y xPitch (x0 0.0) (y0 0.0))

devCounts=makeTable('DEVCOUNT 0)
array = listToVector(foreach(mapcar row reverse(pattern) listToVector(parseString(row " "))))
nRows=length(pattern)
y=y0
for(row 0 nRows-1
x=x0
nCols=length(array[row])
for(col 0 nCols-1
dev=array[row][col]
devCounts[dev]++
name=sprintf(nil "%s.%d" dev devCounts[dev])
Type=cond(
(eq('M getchar(array[row][col] 1)) 'device)
(zerop(row) && (zerop(col) || (col == nCols-1)) 'corner)
(zerop(col) && (zerop(row) || (row == nRows-1)) 'corner)
(zerop(row) || (row == nRows-1) 'topBottom)
(zerop(col) || (col == nCols-1) 'leftRight)
(t 'dummy)
)
caseq(Type
((device dummy)
nf=nfunit
wf=wfunit
)

(corner
nf=DUM1nf
wf=DUM2wf
)

(topBottom
nf=DUM2nf
wf=DUM2wf
)

(leftRight
nf=DUM1nf
wf=DUM1wf
)

(t error("type=%l\n" Type)
)
)

params = list(
list("l" "string" aelSuffixNotation(1u * Length))
list("w" "string" aelSuffixNotation(1u * wf))
list("fingers" "string" sprintf(nil "%d" nf))
if(oddp(row)
then
list("routePolydir" "string" "Bottom")
list("polyContacts" "string" "True")
else
list("routePolydir" "string" "Top")
list("polyContacts" "string" "True")
)
) ; params

when(zerop(col)
; Device is on left edge. Add detached bodytie.
params = xcons(params
list("bodytie_type" "string" "Detached"))
)

when(col == nCols-1
; Device is on right edge. Add detached bodytie.
params = xcons(params
list("bodytie_typeR" "string" "Detached"))
)

inst=dbCreateParamInstByMasterName(cellView devLib devCell "layout" name x:y "R0" 1 params)
xPitch = (nf * Length) + (nf * 0.2)

;; TODO: Replace numbers with space/extension params
;; Or, use rodGetObj and/or M1 geometry of the
;; inst->master cellView to calculate the xPitch
;; of the instantiated device

;; Calculate x coordinate for next device
x = x + xPitch

)
y = y + yPitch
)
dbSave(geGetEditCellView())

)) ; let ; procedure

place_devices(
geGetEditCellView() ; cellView
"tsmcN65" ; devLib
"pch" ; devCell
0.2 ; Length (um)
4 ; nfunit
3.0 ; wfunit (um)
4 ; DUM1nf
3.0 ; DUM1wf (um)
4 ; DUM2nf
3.0 ; DUM2wf (um)
3.78 ; yPitch (um)
list(
"Du Du Du Du Du"
"Du M1 M2 M1 Du"
"Du M2 M1 M2 Du"
"Du Du Du Du Du"
); pattern (rows)
)

Thanks

Regards

  • Note it's very hard to debug code (which I can't run, because I don't have any of the data) if it is so poorly formatted - there is no indentation in the code which makes it very hard to read.

    When you say "the gates are not placed" - do you mean that the poly isn't routed on the devices? That's what I'd expect from the code you've posted. In the list of parameters, the if(oddp(row)... part will only return the final list in each of the then and else parts, and so you'd never have routePolyDir set at all. This is the kind of thing where printing out the value of params as a debug statement after setting it would have revealed the problem - a basic debugging technique in any language.

    I'd probably write it this way:

    params = list(
      list("l" "string" aelSuffixNotation(1u * Length))
      list("w" "string" aelSuffixNotation(1u * wf))
      list("fingers" "string" sprintf(nil "%d" nf))
      list("routePolydir" "string" if(oddp(row) "Bottom" "Top"))
      list("polyContacts" "string" "True")
    ) ; params

    I've no idea whether there's anything else wrong in the code - I just focused on the highlighted part (since you highlighted it).

    Regards,

    Andrew.

  • Can you please tell me how can i print out the output in any part in the code to be able to know the issue and debug it?

    Thanks

  • I'm guessing that if you're asking this, you didn't write the code. I suggest reading the SKILL Language User Guide (it's like a book you might get in a bookshop on a language you're unfamiliar with, and is a great starting point).

    You'd print something either using println(params) - the println function can do a simple unformatted print of a single variable - or using the more powerful C-like printf() function. Or you could use pprint(params) if you want to pretty-print a list of values in a slightly more readable form (println will print it all on a single line).

    Regards,

    Andrew.

  • i was thinking that you to do something in the IDE like what is called breakpoints or something.
    I know these functions you mentioned but as i'm a beginner i didn't know that this can be used for another purpose like the debugging. i thought only they are used if only intended in the code to display something.

    Anyhow i'm opening all the manuals that i can make use inside cadence plus asking here.

    Again i'm a beginner self learning with skill not a professional like you. So please be patient.

  • You can of course set breakpoints in the SKILL IDE. Click to the left of the line of code to do this (or use the menus). More can be found in the documentation for the SKILL IDE.

    Regards,

    Andrew.

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