Help on create VIA in 6.1.4 version

leHiCreateVia or dbCreateVia.

Andrew.

 What is d_viaDefId in dbCreateVia? I got below error for dbCreateVia command.

  x=y=0
dbCreateVia( geGetEditCellView() "M2_M1_S" list(x y) "R0"

                                             list( list("cutRows" 2)             ;row

                                             list("cutColumns" 4)               ;column

                                             list("cutSpacing" list(x y))       ; cut spacing for x and y

                                             list("layer1Enc" list(x y))         ; enclosure for layer1

                                             list("layer2Enc" list(x y))         ; enclosure for layer2

                                             list("cutWidth" 0.2)                 ; cut width

                                             list("cutHeight" 0.4)                ;cut height

                                             list("originOffset" list(x y)))      ; j

 *Error* dbCreateVia: argument #2 should be a database object (type template = "ddltg") - "M2_M1_S"

M2_M1_S is my via name.

Use techFindViaDefByName() to retrieve that.

Andrew.

Hi Andrew,

I have a problem with this subject. My code is below:

viaid=techFindViaDefByName(tfId "VM3_M4")
n =6
dbCreateVia(pcCellView viaid 0:-1 "R0"
viaParams='(("cutRows" n)
("cutColumns" 1)
("cutSpacing" (0.1 0.1)) ; space via
("imp1Enc" (26.07 26.07)) ;PP
("imp2Enc" (0.07 0.07)) ;PDK layer
("layer1Enc" (0.02 0.02))
("layer2Enc" (0 0.03))
))

It doesn't work. And Cadence give a warrning : 

*WARNING* (DB-270576): Invalid cutRows(0)

*WARNING* (DB-270576): Invalid cutRows(0)

But

At line 4, If I use n is 6 (code is viaParams='(("cutRows" 6) ....) it's working. 

Do you have any ideal ? I want to use a parameter (n) instead a number (6) . Thank

Yes, it's because you're passing a quoted list to the function. The quote operator means that the list is taken literally, with no evaluation. So the n in the list is passed as n not 6. Obviously it's not expecting the symbol n there, so it fails.

Another thing - you don't really need to assign the value to a variable (the viaParams= bit) unless you're going to use it later - but maybe that was done for a good reason.

Anyway, what you need is either:

dbCreateVia(pcCellView viaid 0:-1 "R0" 
viaParams=list(list("cutRows" n) 
'("cutColumns" 1) 
'("cutSpacing" (0.1 0.1)) ; space via
'("imp1Enc" (26.07 26.07)) ;PP 
'("imp2Enc" (0.07 0.07)) ;PDK layer 
'("layer1Enc" (0.02 0.02)) 
'("layer2Enc" (0 0.03))
))

or:

dbCreateVia(pcCellView viaid 0:-1 "R0" 
viaParams=`(("cutRows" ,n) 
("cutColumns" 1) 
("cutSpacing" (0.1 0.1)) ; space via
("imp1Enc" (26.07 26.07)) ;PP 
("imp2Enc" (0.07 0.07)) ;PDK layer 
("layer1Enc" (0.02 0.02)) 
("layer2Enc" (0 0.03))
))

This second form is a neat feature of SKILL - a special kind of quoted list. If you use the backquote instead of the normal single quote, then the list is taken literally except where a subexpression is preceded by a comma. Those preceded by commas get evaluated. It's actually a macro that expands into lists of lists etc, but it's a lot more succinct to type!

If you look at viaParams after calling this, you'd see the value 6 where the ,n was. Note there's also another form that can be used inside a backquoted list - ,@ - but I'm not going to cover that here since you don't need it (this is for splicing in lists).

Regards,

Andrew.