How to get location of all terminals in layout view?

Hi,

In layout view, I have instances placed from a PDK, I want to get x,y
location of all terminals for their pCells, how can I do that?

I've tried to use something like: cv~>instTerms~>... but it always
leads to nil.

What I particularly need to do is to add label on each net that is
port/pin (whatever u name it) in the layout.


P.S. I have only floating instances (defaults from PDK) in layout with
no nets...

Can anybody help me out?

Thanks and best regards,
Ahmad

 

Reotaro Hashemoto wrote, on 06/23/09 14:03:

Ahmad,

Starting from a cellView doesn't make much sense - I assume you'd start from an
instance id.

So for example:

; if the instance is selected
inst=car(geGetSelSet())
; or if you know the instance name
; inst=dbFindAnyInstByName(cv "I1")
; or a loop over all instances
; foreach(inst cv~>instances ...)

You can't use instTerms unless it was created with something like Virtuoso XL.
So you'll probably want:

master=inst~>master
transform=inst~>transform
foreach(term master~>terminals
foreach(pin term~>pins
; the reason for the || is so that this works in both CDB and OA. In
; OA, pins can have multiple figures, but in CDB only have one.
foreach(fig pin~>figs || list(pin~>fig)
pinBBox=fig~>bBox
pinCenter=dbTransformPoint(centerBox(pinBBox) transform)
printf("Term %L is at %L on layer %L\n"
term~>name pinCenter fig~>layerName
)
)
)
)

This gives the coordinates transformed to the containing cellView.

Regards,

Andrew.

 

Hello Andrew,

Thanks a lot, I want to understand the logical meaning of
"transformation", can u please explain it?

One more thing, where do more details about ~> elements can be found
explained within manuals? Since trials and guessing from using "~>?"
doesn't always succeed...

Best regards,
Ahmad

 

Ahmad wrote, on 06/24/09 10:40:

Ahmad,

If the pin figures are being found in the master of the cell that is being
instantiated, the coordinates will be in the coordinate space of the master's
cellView - i.e. 0,0 will be the origin of that layout.

When the cell is instantiated, it will be instantiated at a particular x,y
location, and with a specified orientation (possibly a magnification too if in
IC5141). I was presuming you wanted to find the location of the pins on each
instance, in the coordinate system of the cellView containing the instance. So
this means that I need to take the coordinates of the pin figure within the
instantiated master, and then transform to the coordinate system of the
containing cellView - this means applying the same transformation that was
applied to the instance when placed.

Is that clearer?

As for details about the ~> attributes, these are covered in the Cadence Design
Framework II SKILL Functions Reference manual
(<instdir>/doc/skdfref/skdfref.pdf), in Chapter 2 "Database Access", at the end
of the chapter in the section called "Description of Database Objects"

In IC613 it's the same PDF filename, but the title is "Virtuoso Design
Environment SKILL Reference".

Regards,

Andrew.

 

Thanks, it's perfectly clear now.

Regards,
Ahmad