problem with figs~>lpps~>layerName

 Hi,

 First, I strongly recommend that you use foreach instead of the for loops you show, it will be much easier to read and write and will be more efficient too.  For example:

 As to why you get lots of 'nil' in you last section, it is because a figure will not have "lpps", that is a cellview attribute, rather a figure will have "lpp" which is a list of layer and purpose, and not an LPP object (which is what lpps is).

Hope it helps!

Lawrence.

Not sure if you really need to go via the nets or not. As for tutorial, I'm not sure there is one - although this is covered quite well in the standard Cadence SKILL Programming course - see the "Support & Training" link at the top of this web site...

You can also read the "Design Framework II SKILL Functions" manual - this covers the database in some detail.

I've changed your code a bit, to show some slightly different information - using foreach() as Lawrence suggested (you shouldn't use nth() to access lists in a loop, as lists are sequentially accessed, rather than random access, so it can be slow with long lists). You may find this code useful:

cv=geGetWindowCellView()
printf("\nALL LPPS (Layer purpose pair) \n")

; Here I want to check what LPPS I have in my design
;
foreach(lpp cv~>lpps
    printf( "LPP name: %s purpose %s \n", lpp~>layerName lpp~>purpose)
);foreach

printf("\n Figures belongs to LPPS \n")
;print(cv~>nets~>figs~>lpps~>layerName)
pprint(cv~>shapes~>lpp)
newline()

foreach(lpp cv~>lpps
    printf( "LPP name: %s purpose %s \n", lpp~>layerName lpp~>purpose)
    printf( "Shapes on this lpp are: \n")
;; could look at whatever you want.
    pprint(lpp~>shapes~>objType)
    newline()
)

Regards,

Andrew.

Thank you Andrew for your replay,

In fact I will check if this code will give me any results:

pprint(lpp~>shapes~>objType)

But the problem is that I already have a SKILL application whitch uses and I have to use this objects

cv~>nets~>figs~>lpp

The quiestion still remains the same: why while listing all LPPS from CellView, there is no problem, but when I use: cv~>nets~>figs~>lpp the result is nils?

Thanks,

ToM

My guess is that you don't have any connectivity in your layout database - if it's just shapes, then there may not be any connectivity, or there may be connectivity, but no routing on those nets - so no figures on the nets. Very hard to tell without knowing what your data looks like.

Easiest to break down using cv~>nets then cv~>nets~>figs (just type it in the CIW to see what you get).

Regards,

Andrew.

Thanks once again Andrew,

You where right about two things: first of all you're right that you don't have any data about my design, so I've decided to put a screen shot with it, so you can have a look.

http://home.elka.pw.edu.pl/~tscislo/layout.jpg

This is a very simple design which was extracted from layout using Assura extraction tool. This is a NAND cell.

The second thing about which you were right was that I have a problem with routing, because when I execute:

cv~>nets~>figs I get nils

But the problem after the extraction process is that you can actually see the nets on the layout, so I have no idea why the Cadence data base has no information about the figures...

Thanks,

ToM.

 So, no ideas huh guys?

 ToM

I'm not sure what you mean by "seeing nets on the layout". Cadence has net objects and figure objects (paths, rectangles, etc) but if the net information is not attached to the figs, then cv~>nets~>figs can return nil. Select a shape in your layout and see if it has "connectivity" by querying it. If there is no connectivity on the shape, then the shape doesn't have net information.

 Derek

Thank you for your reply Derek,

I've checked what you've suggested and it seams that you were right, when put sth like this in CIW:

cv~>shapes~>net the result was also nils. But I have shapes in my design, because when i put:

cv~>shapes~>isShape I get true as a result...

However I still don't have any idea why, when the connectivity on the layout seams to be ok, Cadence Data Base... has such strange data about my design...

I remind you that, SKILL reports that I have actually nets in design using

cv~>nets

Thanks,

ToM

ToM.

Apologies for not replying sooner - I've been travelling visiting customers and there are only a finite number of hours in the day ;-(

Anyway, if this view was created by Assura extraction, it's possible that there was no saveInterconnect() in the rules and perhaps just copyGraphics() statements. Or it may be because you've done RC extraction, and so there are no actual shapes left (all the shapes have become resistors - I've not checked to see what it looks like as I'm in an airport right now).

Anyway, it's not really clear what you're actually trying to check, so perhaps if we knew that we could make other suggestions (although I think I already did that earlier?).

Regards,

Andrew.