parameters l1 and l2. Provides a way to pass the source or drain
length as a parameter for, for example, an extended FET drain
implemented as a resistor abutting the FET gate. Could potentially
be used as a way to determine source/drain area and perimeter
without resorting to measurements of a shared node.
redundant (same name, different net). Previously, the method was
to keep the first such node and ignore all others except to add
their resistance and capacitance to the original node. This
prevented routines like "def write" from enumerating all nets
unless they had unique names. The new method keeps the additional
records including the node location where they can be found by
EFNodeVisit(), but flags them with EF_UNIQUE_NODE so that routines
like ext2spice or ext2sim can choose to ignore them. This implies
that this method could be used to reimplement "extract unique"
within "ext2spice" or "ext2sim" without altering label text. This
has not yet been implemented.
This commit makes the code (mostly) C99-compatible, enabling to compile
it without the -Wno-error=implicit-function-declaration flag. This
way, Magic becomes usable on arm64 architectures, specifically on Apple
computers with M1/M2 SoC.
prevents magic from crashing but does not do anything about the
fact that a non-existent node ended up in the .ext file, which
will have to be investigated.
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.
EF_SUBS_PORT flags up the hierarchy. This is a rather lot of code
needed to make substrate connections to circuits where the substrate
connects to devices but not make such connections where the substrate
doesn't. There may be simpler ways to accomplish the same thing,
depending on whether the order of "merge" statements in a .ext file
is reliable; this code does not depend on it.
traditionally been kept for backwards compatibility. However, the
operation of "ext2spice" and "ext2sim" as separate programs has
become extremely difficult to maintain, and so it has been dropped
in favor of folding both into the program as commands, as was done
a long time ago in the Tcl/Tk version.
If cells are instanced before being defined, causing the GDS parser
to rewind the cell from the top, then the "already defined" error
messages will be suppressed, since it is to be expected that cells
will be seen twice (and ignored the 2nd time). When rewinding, an
output message is issued so that it is clear that the file contains
instances that are used before they are defined, and recommends the
"gds ordering on" setting. Also: Fixed the "gds ordering" command
code so that the command with no third argument returns the state
of the "gds ordering" setting instead of generating a parser error.
found to make ext2spice runtimes very long for large layouts.
The new method is equivalent but doesn't incur the overhead.
Also: Changed a flag check which was causing the substrate node
to be output as a port for certain layouts where the substrate
node connects to no devices, and so should be optimized out.
node representing the global substrate on cells that are abstract
views. Corrected a typecasting issue in ext2spice.c that throws
a compiler warning. Added another check for a cell being editable
when painting, which is a case that was not covered by the
previous code change to address the same issue.
underlying function from fprintf() to fputs(), which was changed for
gcc11 compatibility by Jean-Paul Chaput in github issue #123. Also
corrected a typo from the previous commit.
Implemented a separate check for ports when writing a subcircuit
that cross-checks against the port list in the flattened
extraction. This allows ports that were optimized out during
flattening of the hierarchy to be removed from the cell's port
list, which cuts down on disconnected nodes in the output port
list.
substrate (bulk terminal) and global substrate. Otherwise, the
routine in ext2hier.c that finds the substrate node will find the
first device bulk connection, not the default substrate.
output for transistors. The problem came from a change made to
fix an issue with capacitors marked as floating nodes because some
nodes are not output as source or drain. But those nodes are output
before the parameters, so when generating parameter output, all
nodes appear to have already been output. Solution: Specify an
additional bit in the "visited" mask for the node having been output
that is separate from the mask for resist classes used by the code
that writes parameter values, and use that bit as a test for whether
the node is connected to some device (not necessarily a FET source
or drain).
client data generated by ext2spice and attached to a node's
nodeClient record; there is an initNodeClient() routine but no
corresponding freeNodeClient() routine. Eventually had to add a
callback function passed to EFDone() and EFFlatDone() to clean up
these entries. After doing that, valgrind reports clean for all
memory allocated within ext2spice (there are other things that are
not freed but not related to a specific command, so do not need to
be treated as leaks).
used by "topVisit" and "subcktVisit" in ext2spice.c, probably
caused by having different names on the same port number, the
subcktVisit() routine was modified to use exactly the same
enumeration as topVisit() so that they are guaranteed to have
the same result.
this limited ports to 16384, which seemed reasonable at the time.
However, the sky130_sram_macro layouts connect power and ground in a
way that when coupled with "extract unique" can generate tens of
thousands of ports and overrun the bit field, showing that automation
can do the unexpected. The solution was to split out the port number
from the label record as its own 32-bit value.
have already been output; i.e., that have EF_PORT set. However,
since EF_PORT is now set on all implicit ports, it is likely that
this part of the code is no longer exercised at all, and may be
removed.
issue at the change made in revision 214. This was done incorrectly
in two ways, one being a set of statements inside an if() block that
should have been executed always, and the other an incorrect use of
the EF_DEVTERM flag, setting it when it should not have been set.
implicit substrate connections under some conditions were not added
to the subcircuit pin list. When this was corrected, the call to
the subcircuit was missing the implicit substrate port. When that
was corrected, the implicit substrate port printed was the subcircuit's
local node name, not the connection from above in the hierarchy. The
underlying problem was that the substrate was marked as a port in a
node record that was in another (flattened and unused) def and so not
seen when enumerating the def's node list. It's possible that the
better solution is that the efNodeHashTable() should be enumerated to
write subcircuit ports, not def->def_nodes. However, now, by using
EFHNLook(), the corresponding entry in efNodeHashTable() is found and
used.
substrate nodes in subcircuits that don't make connections to the
substrate (such as arrays of pFETs). This is done under the
restriction that ext2spice is being called without generating
parasitics (otherwise the connection to substrate is valid), as it
would be when extracting for LVS. The ground node must not appear
as a connection to any device. This is then propagated up the
hierarchy such that if none of a subcell's descendents connect to
the substrate, then neither does the subcell.
previous commit and can cause ports in the SPICE netlist to have
names other than what the port label declared. Expected not to be
fatal to the netlist, but it's a bit difficult to work with a
subcircuit that doesn't have the expected pin names.
that commit claimed to correct an issue with implicit ports not being
output, the solution often failed to properly assign the port number,
so while the implicit ports were added to the subcircuit definition,
they were often missing from the subcircuit call.
very long time but never discovered; in which any implicit port
connection into a subcell (that is otherwise labeled with ports) that
appears at the end of the node list (i.e., after all the declared
ports), will not be output, either in the subcircuit definition or
calls.
implements a method for handling ports in a subcircuit that have different
port names and indexes but are shorted together. "none" is the default
and backwards-compatible behavior that merges ports together, which will
often cause one of the ports to be optimized out of the netlist. "resistor"
will separate the port names with a 0-ohm ideal resistor. "voltage" will
separate the port names with a 0-volt voltage source. This should work
well for simulation and potentially for LVS, although its impact on LVS
has not been fully investigated.
code from extflat from type unsigned long to type TileTypeBitMask.
This increases the number of types of each to 256 and tracks the
number of types, so it should be difficult to exceed this amount.
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.
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.
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.
that have been removed by flattening into the parent cell due to lack
of devices. Previously the checks on writing the subcircuit and writing
the call were slightly different, leading to instances in which the
subcircuit call would be written to the netlist output without the
subcircuit being defined. (2) Corrected an error in the "bridge" CIF/GDS
output operator. In certain (somewhat rare) geometries, the tile behind
(instead of in front of) the corner being checked may be incorrectly
flagged as a DRC spacing error. The fix is to ignore tiles that are
behind the corner being checked.
tech file format "version" section. This can be used to specify the
version of magic that must be used to be compatible with the tech file.
This effectively supercedes the technology version number. (2) Changed
the behavior of "make" to set the version and revision numbers on doing
"make" instead of "configure". This allows the version to update
correctly after doing a "git pull" followed by "make" without doing
"configure" in between. (3) Fixed a couple of issues that were flagged
as compile-time warnings.
could have multiple ports of the same name. This problem had been
worked over before, but there was an indpendent mechanism producing
the same result for a completely different reason, caused by subcells
being much larger than the cookie-cutter extraction method's extraction
regions. Solved by tracking port names in a hash table and preventing
re-use. (2) ext2spice was producing "no such node" errors; like (1)
this had been previously worked on, and like (1) this mechanism was
independent. Problem came from not passing -1 to extHierSubstrate for
the non-arrayed dimension of a 1-dimensional array. Also: Removed
the word "fatal" from extraction error reporting, as nearly all
extraction errors are entirely benign. This should clear up confusion
among alarmed end-users.
p device; this was previously dependent only on the first character
of the extracted device model name. Since the tech file has control
over what the device layer names are but not the extracted model
names, the device layer type name is used as a backup way to determine
if the type is n or p, if that cannot be determined from the extracted
model name.
support asymmetric FETs and other devices like bipolars that have
three distinct terminals. This does not go as far as it should to
make the array independent of the number of declared terminals of
the device. However, it suffices to make, e.g., parameter "a2=area"
work for a bipolar device, and to generate the right drain and source
areas and perimeters for asymmetric (e.g., extended-drain) devices.
Tim Edwards
Alessandro De Laurenzis