- name compare of net names wasn't always case insensitive
- tentative evaluation was sometimes continued even after
a contradiction was detected because the return codes
of different edge examinations were not combined correctly.
Breakout cells can be specified to shortcut hierarchy
evaluation for some cells. This allows treating SRAM cells
as isolated entities - specifically when it comes to extracting
devices.
The solution is to take intruder instances from as
far as possible in the hierarchy. This provides a
performance improvement in some cases, specifically
if this leads to compression of contexts.
same_nets, equivalent_pins, same_circuits and same_device_classes
can now be given at the beginning of the LVS script. This will
simplify building universal scripts with the run specific part at
the beginning (one "load" section).
The price are somewhat less specific error messages when something
fails in these methods.
Fake pins: pins that happen because something connects to a cell at an
unexpected position. Such a pin is difficult to find. The solution is
to keep those nets and nur purge them so these nets can be identified
in the layout.
Here: is_floating? will be true only if there are no pins. Hence
nets with pins are not removed. is_passive is introduced for nets -
passive nets are such that don't have elements, but a pin.
Circuits are purged if they only have passive nets.
Consistent behavior for file paths for images too.
Plus: image paths are not kept as absolute paths
inside the session.
This makes regeneration of images stable.
- "follow selection": allows navigating between the bookmarks
with the cursor keys
- "manage bookmarks" now starts with the selected bookmarks
also selected.
Here is the proposal:
- There is a new panel similar to the layer list showing the
bookmarks. It can be shown using View/Bookmarks.
Initially this panel is hidden.
- Double-clicking on an item in this bookmark list will
navigate to the bookmark.
- Context menu entries of this panel are: manage, load and
save bookmarks (like in main menu)
In addition, "bookmark this view" now proposes a bookmark name
make of "B" and a unique number.
The help link wasn't working for File/Setup/Rulers/Templates
("here"). Also: if clicked from the model "Ruler and annotations setup"
the link was working but the help window wasn't usable. The modal
setup dialog was hiding the help window.
Three mode menu items appear in "Targets for Key Binding"
in the setup dialog and can be bound to a key.
"Move Interactive" will immediately start moving the
selection.
"Paste Interactive" and "Duplicate Interactive" will
paste and then immediately start moving.
Remaining issue: when Paste or Duplicate moves are
cancelled the pasted objects will still be there and
at the original location. So they are may be hard to
see. Also with Undo, two undo items are there: Paste
and Move.
The solution tries to be a bit more generic:
- four buttons are there to synchronize coordinates
- three buttons to snap p1, p2 and auto-measure from p1.
The problem was that with the floating test case, the
ambiguity resolution sometimes assigned the wrong pins
and floating pins/connected pins were swapped.
One option is to make the ambiguity resolver consider
the pin connection state when tenatively evaluating
nodes.
Another option is to put more emphasis on net names
and use them for ambiguity resolution. This has helped
here.
1.) is_floating is now only true if there is no device
and no subcircuit on a net. This means we only purge
nets if they are really floating. So far we purged
nets without pins which lead to the mismatch:
Before purge:
Layout: (net) <--> DEVICE.TERMINAL
Schematic: PIN <--> DEVICE.TERMINAL
After purge:
Layout: (null) <--> DEVICE.TERMINAL
Schematic: PIN <--> DEVICE.TERMINAL
(null does not match any net)
2.) circuit pin matching was a bit picky. Only when
one circuit did not have pins, matching was sloppy.
In real cases however, circuits may have unconnected
pins:
- top level pins without a counterpart (no label)
- subcircuits pins which are not used
We catch both cases by refining the match: if a pin
is not used, it does not need to match against
any other pin. It's reported as "matching against null"
though.
Multiple files can now be selected for "File/Import/Other Files into current".
NOTE: performance for many files may not be excellent
due to re-sorting of hierarchy and bounding box re-computation.
Rerun LVS: a button is provided which allows re-running
the LVS or netlist extraction from the netlist browser.
TODO: a generic concept for triggering the generators
"Partial LVS" is a feature where it's possible to
select a layout subcell - running LVS then will only
compare against the corresponding schematic subcell, not
the whole tree. The magic is done by "align" which will
remove the upper hierarchy part.