tracks the output printed to stdout when matching pins. One section
of this subroutine used the wrong pointers when writing to the Tcl
list (for eventual JSON output) which was the fundamental error.
Beyond that, the "debug" case (if used) would fail to run some of
the matching code, and the "no matching pin" case needed to be
handled for the Tcl list output. Now the terminal output, terminal
debug output, and Tcl list output should all be in agreement on the
pin lists.
connected only to ports and not to any devices, then they do not
show up in NodeClasses() and so pass through most of the checks
in MatchPins(). A separate correspondence check is needed to make
sure that the same shorted ports appear in both netlists.
This is done by treating the loop variable as a temporary parameter
that is valid only inside the loop, and changing the parameter
value on each loop iteration. The file stream position is used
to iterate the loop with calls to fseek() and ftell(), so that the
input tokenizer continues to work within loops.
string for the setup file to be the "trivial default" previously
used in case of the setup file not being found. Put a newline
around the setup file messages so that they stand out from the
rest of the initial output information.
passed an invalid setup file, the netgen "lvs" script uses a
trivial default setup and issues no error or warning. Replaced
this behavior with an error message and a hard stop.
to have unique class hashes. This has the problem that it prevents
comparing N-to-1 cells because declaring X->X1 as equivalent breaks
the original name equivalence of X->X. The new implementation adds
the switch "-unique" to preserve the original behavior. Otherwise,
the class hashes are made the same as the 2nd cell passed to the
command, and it is the responsibility of the person running LVS to
ensure that this is done in the correct direction.
network parallel/series networks. Instead, added a global option
with command "property tolerance strict|relaxed" to reinstate the
original (strict) behavior on demand, while relaxing it by default.
This allows certain series/parallel networks to match numerically
even though the schematic netlist may have combined individual
devices.
with Tcl, since Tk is launched independently through the console
script and nothing inside of netgen itself involves graphics.
This prevents netgenexec from linking to Tk and X11 libraries.
the parallel sorting routine. This fixes occasional property
errors with series-connected devices such as resistors. (2) Added
a method to associate properties with specific pins when pins are
permutable. This allows netgen to properly check a value like
source/drain area when the definition of source and drain has
changed due to permutation of the device. (3) Added a "property"
command extension "associate" to associate a property with a pin,
for use with the method described in (2).
LVS result. The property matching was failing to match (M=1) to
(M!=1) if M was not registered as a property name (which it often
isn't). This would allow devices with different numbers of
instances in parallel to be put in the same matching group,
which then could later identify as a mismatch if the instances
were checked in a different order.
netgen is supposed to be checking properties for symmetry sorting,
but not reporting anything. This causes mysterious property
mismatch errors that don't actually exist to show up in the
output.
is that when the "class ignore" command is used, then ports of a
parent cell need to be checked for being disconnected if they
connect only to ports of an ignored/deleted child cell.
then flattening instances of that cell can cause a port of the parent
cell connected to the disconnected port of the child cell to itself
become disconnected. If the parent port is not changed to show the
disconnected state, then pin mismatch can occur if the netlist being
matched didn't have the same flattened subcell. This condition is
now detected and handled correctly.
Tim Edwards
Donn
D. Mitch Bailey