rename net via skill?

Hi Dan

You can use dbRenameNet function. Please refer to $CDSHOME/doc/skdfref/skdfref.pdf for more details.

Best regards
Quek

Hi Dan

I also have no idea why it is hiding in the cellview database section. : )

Best regards
Quek

dbRenameNet gives still problems for me. I want to rename a NET named RD<7:0> to RD<31:0>. When I run execute dbRenameNet(net "RD<31:0>") I get:

*WARNING* (DB-270502): Illegal name width - RD<31:0>

I got net from a schematic cell view, e.g.

cell = dbOpenCellViewByType("libname" "cellname" "schematic")

net = car(cell->nets)

try "RD\<31:0\>"

ebecheto said:

try "RD\<31:0\>"

Huh? That's not going to work. No idea why you suggested that. That's an illegal name in Virtuoso. For a start, SKILL would complain about the backslashes (unless you used two) and even then the database would tell you this is an invalid name.

The issue here is that  you're trying to rename the net and the existing net consists of 8 signals, and you're expecting that to magically map onto a 32-bit wide net - how would the signals map? I suspect even the old way of doing it (before dbRenameNet was introduced) wouldn't work - this was to use dbMakeNet() to create the new net name and then dbMergeNet to merge them together. I think they must have the same width otherwise it doesn't make sense.

However, since this is a schematic, the right thing to do is to change the label (or pin) associated with the net and then run schCheck() to re-extract the connectivity). Messing at the database level might work but as soon as you check-and-save again, it would have reverted.

Regards,

Andrew.

Andrew Beckett said:

However, since this is a schematic, the right thing to do is to change the label (or pin) associated with the net and then run schCheck() to re-extract the connectivity). Messing at the database level might work but as soon as you check-and-save again, it would have reverted.

One complication, the net name is determined by an output pin and I don't seem to find the label that determines the name of the pin. The only thing I do find representing the name of the output is a net, but I can't rename that net.

I can get the RD<7:0> output pin instance in the following way:

pin = nth(3 cell->instances)

How do I go on then to rename it to RD<31:0> ?

try "RD\<31:0\>"  ;<== Huh? That's not going to work. No idea why you suggested that.

My mistake, i wrote without thinking, i though it was like in the calculator, OP("MN0\\<0\\>" "??"), so you are double right, as usual...

You can't get the pin that way (because you can't guarantee it will be the third instance). Anyway, the trick here is to update the terminal. Because the terminal name can't be updated to a different width, you need to recreate it. This code will do that:

cv=geGetEditCellView()
term=dbFindTermByName(cv "RD<7:0>")
pinFigs=foreach(mapcan pin term~>pins pin~>figs)
newNet=dbMakeNet(cv "RD<31:0>")
foreach(pinFig pinFigs
  dbSubFigFromPin(pinFig~>pin pinFig)
  dbCreatePin(newNet pinFig)
)
; dbDeleteObject(term)
schCheck(cv)

What this does is find all the pin figures associated with pins on the original terminal name, and then pulls them off the old pin and creates a new pin associated with the new wider net.

The dbDeleteObject isn't really necessary because the schCheck will clean up any terminals that aren't used any more (so I commented it out).

Regards,

Andrew

Thanks,

That did the trick (and of course I knew the third pin was no guaranteed to be the RD net one).

Staf.