====== ext2sp ======

''ext2sp'' converts a (hierarchical) magic extract file into a hierarchical spice file for simulation with SPICE simulators like [[http://xyce.sandia.gov/|Xyce]] or ''ngspice.'' Running the tool is straightforward:
<code>
  ext2sp file.ext > file.spice
</code>
will convert the hierarchical extract file into the corresponding spice file. For this to work properly, there are a number of configuration parameters that are set in the ACT configuration file.

<code>
string_table ext_devs "nfet" "pfet"
</code>

This table specifies the list of devices supported by the ''magic'' technology file. The devices //must be listed in the same order as the resistance classes in magic//.

<code>
string_table ext_map "nfet_svt" "pfet_svt"
</code>

This table specifies the mapping between the ''magic'' devices listed in the ''ext_devs'' table and the standard ACT device names.

Finally, different versions of SPICE use different path separators. This can be specified using the following configuration option (which specifies the correct value for ''Xyce''):
<code>
string spice_path_sep ":"
</code>
While tools like ''hspice'' and ''ngspice'' use ''/'' as the separator, ''Xyce'' uses '':''.