rename net via skill?

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.

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.

When I used dbRenameNet() command , it renames the net but after check-and-save it's name  got reverted. I tried schCheck() command also. If the process of changing the net name is to by changing the label/pin , then what is the use of dbRenameNet() command ? please give some example.

Thanks,

Prasad

Hi Prasad,

The function is useful if you are modifying the connectivity in a database that is not going to be checked-and-saved. That might be a database with connectivity but no physical wiring, which is perfectly possible to create. Sometimes this is done for automatically generated views, or extracted views, or within a schematic pcell (where you can't run schCheck because schCheck is not a pcell-safe function). It could also be connectivity in a layout view.

If however you're modifying a schematic which is going to be checked-and-saved, you need to remember that the connectivity is derived by the schematic extractor and it starts from the pins and labels attached to wires - the wires are physical representation, and then the schematic extractor creates the nets and names them appropriately based on the physical drawing.

Regards,

Andrew.