reading GDS files, caused by an unneeded change to pass both
the "original" filename and the actual filename when handling
compressed files---The original filename is unneeded.
(2) Implemented several new methods for parasitic extraction. The
first is an option offset value to apply to sidewall calculations.
This handles issues where actual wire separation is different
from drawn wire separation, which can be significant for the
1/d calculation of sidewall coupling. The second method is to
use the recently-added fringe halo to compute the coupling of the
fringe capacitance to nearby wires. Prior to this change, all
fringe capacitance was applied to surfaces directly under a wire
edge as if the fringe capacitance did not extend outward from the
edge. Now the capacitance is properly pro-rated for the position
of any overlapped shape inside the fringing field. Finally, the
third method added is a new search algorithm for finding the
nearest shapes along the length of a boundary. This is used for
sidewall coupling and fringe shielding, where the nearest shape
dominates the coupling, and any shapes behind are shielded and
may (to first order) be ignored. Previously, the entire halo
was searched without regard to shapes shielding other shapes
behind, and a recent correction added an ad-hoc search for
blocking shapes that was inefficient and not always correct.
The new method is both efficient and accurate.
to the fringe shielding calculations, which uses very similar code and
suffered the same problem of not being able to recognize when another
shape was between the two edges under consideration. Fixing this
makes the fringe shielding calculations symmetric, as they should be.
computing coupling to shapes that are shielded by other
intervening shapes. This is not a perfect solution but will
properly handle all but a few pathological cases.
Compression levels of the output can be controlled with the "gds
compress [<value>]" command, where <value> 0 (default) is uncompressed
output, 6 is "normal" gzip compression, and 9 is maximum compression.
pointing GDS_FILE to a compressed filename when using "gds readonly
true" on a compressed file. The start and end pointers still point
to data bounds in the uncompressed file.
of systems calls to "gzip" and "gunzip". A compressed GDS file can
be made simply by doing "gds write <name>.gds.gz", and can be read
simply by doing "gds read <name>.gds.gz". Names of compressed files
can be put in the GDS_FILE property of a cell.
which instead of defining a device or subcircuit that exists inside
the cell, instead redefines the cell itself as a device or subcircuit
model that exists in the PDK. This is used where a specific layout
subcell has its own associated device definition in the PDK. Instead
of the "device" property value being the line that gets generated for
a device in the subcells .ext file, the property value should be the
word "primitive" optionally followed by any parameters that need to
be passed to the subcircuit call.
to NULL for a read-only view. . . Changed the command "what" so that
it will not fail on a non-edit cell. There are likely a few other
commands that should not fail on non-edit cells because they do not
alter anything.
+ Add "smoke test" build CI to Github Actions
+ Added a configure_mac script (requires brew)
~ caddr_t -> void* (was never a part of any UNIX standard)
(Take two)
+ Adds a GitHub Actions flow that builds an AppImage (see AppImages.org) that can produce a monolithic magic binary
~ Fix a portability issue in tcltk/magic.sh.in
This binary should theoretically work on any Linux distro with Glibc 2.3+ and Cairo 1.8+, which is any up to date distro in the last decade.
transferred when doing a node merge, which can cause named
terminals to get lost, because there is no longer a node with
a name corresponding to the terminal. The node gets a default
name which is not the terminal name, and the netlist is broken.
recognized as a valid command when file locking has been disabled as
a compile-time option. The command then generates an error on
"locking enable" but simply ignores the command "locking disable".
gates when the gate length minimum may be larger than the gate
width minimum, and to implement an "angles" option on the "width"
rule that can implement rules where a layer width must be wider
as measured from angled edges than from straight edges.
the "width" rule is assumed to be symmetric, and not checked in all
four directions, as that would be redundant. But non-Manhattan tiles
are not symmetric and must be checked all four directions. Implemented
in a way that does not increase the DRC processing time.
shrink routine that over-computes the diagonal position (the
equation failed to divide the intersecting angle in half).
Rewrote the equation for the correct grow distance, still
accounting for the grid limit (if set).
substrate shielding types in a subcell inside the interaction area
only. Since the interaction area is clipped by the "cookie cutter"
extraction areas, it could completely miss the shielding. As
revised, any shielding under a subcell will effectively shield the
entire subcell. This could be improved by warning if the subcell
has substrate connections outside of the shield area (as that is
not extractable), but that requires additional processing.
When running preproc.py, use the python3 that the configure script found
instead of assuming (via preproc.py's #! line) that it is called
"python3" and is located in PATH. This allows the user to specify a
different python3 by running e.g.:
./configure ac_cv_path_PYTHON3=/path/to/python3
fact that "extract all" does not enumerate cells from bottom up
as I had assumed---The order is roughly bottom-to-top, but cells
re-used in different places in the hierarchy could end up called
before one or more of their own subcells is extracted. Since
this conflicted with the preparation of the substrate in each
extracted subcircuit, I changed the method to enumerate cells so
that it is properly bottom-to-top. Also, methods were added to
"extract" (incremental), "extract cell", and "extract parents"
to ensure that the substrate is prepared on all subcells before
extraction.
extFindNodes() does; consequently, ExtLabelRegions() when called
after ExtFindRegions() may accidentally chain together a substrate
region with whatever was left in this linked list after the
previous call to extFindNodes(), with unpredictable results.
DEF reading to use vector fonts on PIN labels, with some ad hoc
rules for size and rotation (may need refinement). Modified the
DEF annotation (def read -annotate) so that the preferred position
of labels is on a wire leading out from a pin connection, which
is a "safer" place to put it, in case the layout was manually
edited between the DEF read and annotation. Fixed another two
crash conditions related to read-only views. Corrected a startup
error caused by an uninitialized variable used by the "wiring"
section of the tech file.
Tim Edwards
Mohamed Gaber
Ryan Schmidt