Provided by: magic_8.3.105+ds.1-1.1_amd64 
NAME
ext2spice - convert hierarchical ext(5) extracted-circuit files to flat spice files
SYNOPSIS
ext2spice [ -B ] [ extcheck-options ] [ -M|m ] [ -y num ] [ -f hspice|spice3|spice2 ] [ -J hier|flat ] [
-j device:sdRclass[/subRclass]/defaultSubstrate ] root
DESCRIPTION
Ext2spice will convert an extracted circuit from the hierarchical ext(5) representation produced by Magic
to a flat spice file which can be accepted by spice2, spice3, hspice and other simulation tools. The
root of the tree to be extracted is the file root.ext; it and all the files it references are recursively
flattened. The result is a single, flat representation of the circuit that is written to the file
root.spice .
The following options are recognized:
-o outfile
Instead of leaving output in the file root.spice, leave it in outfile.
-B Don't output transistor or node attributes in the spice file. Usually the attributes of a node
or a device are output as special comments **fetattr and **nodeatrr which can be processed
further to create things such a initial conditions etc.
-F Don't output nodes that aren't connected to fets (floating nodes). Normally capacitance from
these nodes is output with the comment **FLOATING attached on the same line.
-tchar Trim characters from node names when writing the output file. Char should be either "#" or
"!". The option may be used twice if both characters are desired. Trimming "#" and "!" is
enabled by default when the format is hspice.
-M|m Merge parallel fets. -m means conservative merging of fets that have equal widths only (useful
with hspice format multiplier if delta W effects need to be taken care of). -M means aggressive
merging: the fets are merged if they have the same terminals and the same length.
-y num Select the precision for outputting capacitors. The default is 1 which means that the
capacitors will be printed to a precision of .1 fF.
-f hspice|spice2|spice3
Select the output format. Spice3 is the the format understood by the latest version of berkeley
spice. Node names have the same names as they would in a sim(5) file and no special constructs
are used. Spice2 is the format understood by the older version of spice (which usually has
better convergence). Node names are numbers and a dictionary of number and corresponding node
is output in the end. HSPICE is a format understood by meta-software's hspice and other
commercial tools. In this format node names cannot be longer than 15 characters long (blame the
fortran code): so if a hierarchical node name is longer it is truncated to something like
x1234/name where x1234 is an alias of the normal node hierarchical prefix and name its
hierarchical postfix (a dictionary mapping prefixes to real hierarchical paths is output at the
end of the spice file). If the node name is still longer than 15 characters long (again blame
the fortran code) it is translated to something like z@1234 and the equivalent name is output
as a comment. In addition since hspice supports scaling and multipliers so the output
dimensions are in lambdas and if parallel fets are merged the hspice construct M is used.
-J hier|flat
Select the source/drain area and perimeter extraction algorithm. If hier is selected then the
areas and perimeters are extracted only within each subcell. For each fet in a subcell the area
and perimeter of its source and drain within this subcell are output. If two or more fets
share a source/drain node then the total area and perimeter will be output in only one of them
and the other will have 0. If flat is selected the same rules apply only that the scope of
search for area and perimeter is the whole netlist. In general flat (which is the default) will
give accurate results (it will take into account shared sources/drains) but hier is provided
for backwards compatibility with version 6.4.5. On top of this selection you can individually
control how a terminal of a specific fet will be extracted if you put a source/drain attribute.
ext:aph makes the extraction for that specific terminal hierarchical and ext:apf makes the
extraction flat (see the magic tutorial about attaching attribute labels). Additionally to
ease extraction of bipolar transistors the gate attribute ext:aps forces the output of the
substrate area and perimeter for a specific fet (in flat mode only).
-j device:sdRclass[/subRclass]/defaultSubstrate
Gives ext2sim information about the source/drain resistance class of the fet type device. Makes
device to have sdRclass source drain resistance class, subRclass substrate (well) resistance
class and the node named defaultSubstrate as its default substrate. The defaults are
nfet:0/Gnd and pfet:1/6/Vdd which correspond to the MOSIS technology file but things might vary
in your site. Ask your local cad administrator.
The way the extraction of node area and perimeter works in magic the total area and perimeter of the
source/drain junction is summed up on a single node. That is why all the junction areas and perimeters
are summed up on a single node (this should not affect simulation results however).
Special care must be taken when the substrate of a fet is tied to a node other than the default substrate
(eg in a bootstraping charge pump). To get the correct substrate info in these cases the fet(s) with
separate wells should be in their own separate subcell with ext:aph attributes attached to their
sensitive terminals (also all the transistors which share sensitive terminals with these should be in
another subcell with the same attributes).
In addition, all of the options of extcheck(1) are accepted.
The awk filter spice2sim is provided with the current distribution for debugging purposes.
SEE ALSO
extcheck(1), ext2spice(1), magic(1), rsim(1), ext(5), sim(5)
AUTHOR
Stefanos Sidiropoulos.
BUGS
The areas and perimeters of fet sources and drains work only with the simple extraction algorithm and not
with the extresis flow. So you have to model them as linear capacitors (create a special extraction
style) if you want to extract parasitic resistances with extresis.
4th Berkeley Distribution EXT2SPICE(1)