Hi,
I was hoping to use klayout as a DEF viewer, but it seems to be throwing error (subject line).
The line that is referenced is highlighted below:
NEW METAL1 ( 185270 2150015 ) via1
( * 2148785 ) <<<<<<<<<<<<<<
NEW METAL2 ( 185030 2148785 ) via2_770_290_ALL_2_
I am only trying to import the DEF i.e. no LEF or other techfiles - could this be the issue?
I am on windows using KLayout 0.24.9 (2016-11-27 r3488)
Thanks,
Steven
Comments
Hi Stefan,
that's not related to not having LEF. I assume a reader bug or maybe the specification got updated. I have limited access to DEF sample and the variety of flavours is overwhelming, so I'm depending on your inputs. Could you provide a (reduced) sample DEF that allows reproducing that issue?
And if possible, please file an issue on GitHub: https://github.com/klayoutmatthias/klayout/issues.
Thanks,
Matthias
Unfortunately, I know nothing about the DEF format, but I'll see if I can provide a small example.
Steven
Hi Steven,
I think I can reproduce the issue and tried to fix. When reading the spec again I assume there is another issue hidden behind that one: if the wire is continued, it needs to be continued at the point of the via. See my comments on GitHub.
I'll try to patch this into the upcoming 0.24.10 version - I hope you find a way to verify this.
Thanks,
Matthias
I tried 0.24.10 version, and was able to correctly read in the DEF.
One thing that was unexpected - there doesn't seem to be any instance data imported, or at least I was not able to do a search for instances.
Thanks,
Steven
Hi Steven,
again, without a sample I can hardly say anything. Instances are not necessarily created when reading DEF. You say, you don't have LEF, so where should instances come from?
Matthias
I have now imported a a LEF
The LEF defines the library information - for example, it defines all available Standard Cell Types (AND2X1, ORX2 etc)
The DEF defines a design - in addition to physical information, it defines all nets, and instances of all cells used in the design. As an example:
COMPONENTS
- LOTS SNIPPED
- core_alt_inst/dft_timer_inst/U21 NAND2X1 + PLACED ( 507960 1019440 ) N ;
- LOTS SNIPPED
END COMPONENTS ;
In this case, the instance name is core_alt_inst/dft_timer_inst/U21 NAND2X1 (where "/" is the hierarchy separator, and is defined at the top of the DEF file)
(there are also sections for all nets, all vias etc)
It doesn't look like klayout is what I want - I am not looking for a layout tool, just trying to look at the relative positions of some cells. Maybe I can hack something up myself
Thanks for the help
Steven
http://www.peardrop.co.uk/
Stefan
Steven