conversion, largely converted from the python script in open_pdks,
which itself was derived from an efabless script, and none of
which have been particularly well tested.
characters. Instead of removing the non-alphanumeric characters, magic
now prepends an "x" to the name. Since this naming restriction does not
necessarily impact, say, LVS, it would probably be better to let this
behavior be enabled or disabled by a command.
The previous behavior was to generate hierarchical names for all
labels when copying contents of subcells. This is "safe" for
copying selections without accidentally shorting things through
labeling, but it can make a mess of the selection. Options are
now "select do labels" for the existing behavior, "select no labels"
to not show any labels, and "select simple labels" to show only the
root name of labels in subcells.
SPICE netlist output that appears to have come from flags created
for writing DEF that inappropriately got set during ext2spice.
A redundant call to efAddNodes() was adding confusion by appearing
to handle most cases but actually missing some. With the corrected
flag, the redundant call is really redundant and can be removed.
It has not been tested whether DEF output is affected by the change
(DEF output from magic is rarely used, anyway).
area and perimeter across devices. The distributed allocation
was missing for hierarchical output, and the function that
accumulates values per resistance class was initializing by
iterating over device classes, not resistance classes, leading
to a segfault if the number of device classes is larger than the
number of resistance classes.
based on the contents of a .mag file being read in, assuming
compatibility with principles of open_pdks. The search paths
are not meddled with unless a file is read for which the technology
cannot be found (and a technology has not already been read, or at
least no database file exists in memory using any technology that
has already been read). If so, then variables PDK_PATH and PDK_ROOT
are searched for in both the shell environment and the local Tcl
environment. Also, if open_pdks has installed PDKs in the path
/usr/share/pdk/, then that path will be searched. If a corresponding
technology file is found, it will be loaded. If the path corresponds
to an open_pdks-style path, then the library paths in libs.ref will
also be added to the search paths for cells.
from slashes in hierarchical names. Magic does not allow slashes
in names when using "identify", so the simplest solution is just
to prohibit them in names being read from GDS files, and replace
them with underscores to make them magic-compatible. Changing
GDS names always has repercussions on things like back-annotating
delays, so it should probably be revisited in the future.
This reverts commit 46baae0ce6.
Reverting the last commit, as it does not work completely the way it
is supposed to, and will most likely have to be done in a different
way.
array delimiters and hierarchy separators (characters '/', '[', and ']')
that are part of instances or labels passed to magic, are preserved
from input to output, but internally marked (with a backslash escape)
so that they are not misinterpreted my magic when running ext2spice.
to get the pixel size of the default font, and scale the window
glyphs and scrollbars to match, so that the display is automatically
adjusted for screen resolution and does not require manual intervention
to correct for high resolution displays.
GDS_FILE property in the same way that it handles changes to the
FIXED_BBOX property, by setting or clearing the associated flag
bit in the cell. Otherwise, it becomes impossible to make a
cell writeable, as it always has some belief that it is still
attached to a specific GDS file. Corrected an error in the
"gds" ("calma") command parsing that switched the callbacks for
the "noduplicates" and "nodatestamp" options.
of an instance with double-escaped brackets if the instance name
contains brackets. This then undermines the use of the backslash
escape and causes the interpreter to raise an error instead of
printing the name.
If exit is called in a TCL script that is executed at startup, the libc
exit() function is called directly and we don't get a chance to reset
the terminal. We return to the shell with echo off, and have to run
"reset". A simple example:
echo exit > test.tcl
magic -noconsole -dnull test.tcl
There are a few ways we could solve this. We could register an exit
handler using atexit(). Here I use Tcl_SetExitProc() to register a
callback with the TCL interpreter.
it as a single value "flags" (unsigned char) with meaningful flag
names. Added new option "-fail" to the load command to allow
magic to fail on loading a cell that does not have a corresponding
file rather than the default action of creating a new cell. Added
a flag for the "-quiet" option so that behavior on "-fail" can be
done quietly.
one is an "off_grid" DRC type, which can be used to check geometry
that is below the manufacturing grid. Normally magic prevents the
grid from being subdivided below the manufacturing grid, but this
limit can be removed and replaced by DRC checks to check for such
errors in a GDS file of unknown origin. The second version looks
for interactions between subcells that end up with intersections
of non-manhattan geometry landing on points that are not on the
database internal grid. Such errors cannot be seen by magic's DRC
engine by definition, and so must be detected while flattening
geometry for the DRC checks.
with qflow, which wants to launch applications from symbolic links.
The portability of magic now depends only on setting environment
variable CAD_ROOT, but the portability should still be ensured.
"bridge" GDS output operator; the previous equations were, under
some situations, failing to meet the width requirement. Also:
corrected the "cif style" check so that it does not claim that a
style name with an exact match is ambiguous. Also: Corrected the
use of "grid limit", so that the limit correctly scales with the
output expander value.
unique will also be assigned a unique port index at the end of the
port list. That ensures that the unique names are all properly
found in the extracted .subckt for the cell.
cell def that is marked for a "full dump" from a referenced GDS
file. This change was supposed to have been done a few commits
ago but did not work as advertised.
asymmetric MOSFET definitions in the tech file "extract" section.
Corrected the nmos.tech.in file to put the resistance classes in
plane order, as otherwise the interpretation of which resistance
classes belongs to the transistor source and drain can get messed
up by the presence of buried contacts.
magic database derived layout of a cell that declares GDS_FILE
but for which the GDS file referenced cannot be found or read.
This will produce an incomplete GDS file instead of an apparently
good and complete GDS file that actually contains bad data. Also:
Added new command "random" that allows a random seed to be set,
for use with the GDS output when writing a full dump of a GDS
file. Otherwise, the output prefixes are always the same, which
defeats the purpose of adding the random prefix.
magic (version 6.3) and lightly edited it to make it compatible
with version 8.3. Edited the scmos/Makefile so that it installs
with the rest of the distributed tech files.
to stop the search whenever a cell is not found. Used this to implement
a new option for GDS writes, "gds undefined allow|disallow" (default
"disallow") controls whether or not GDS with undefined references will
be allowed to be written. Similarly affects CIF and LEF writes, extraction,
and DRC (when running "drc check" from the top).
I'm seeing warnings when parsing a DEF with BLOCKAGES in it:
DEF read, Line 572201 (Message): Unknown keyword "BLOCKAGES" in DEF file; ignoring.
DEF read, Line 572202 (Message): Unknown keyword "-" in DEF file; ignoring.
DEF read, Line 572205 (Error): END statement out of context.
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Tim Edwards
Anton Blanchard
Dan Moore