.. _config_ref charmmff:

``charmmff``
============

The ``charmff`` attribute informs pestifer which CHARMM force-field parameter and topology files are to be 
used for all psfgen/namd3 executions.  ``standard`` refers to files that are found in the official CHARMMFF 
release, and are referred to by their base filenames, regardless of whether they live in the topmost ``toppar`` 
directory or one of the stream subdirectories.  ``custom`` refers to files that are not part of the official 
CHARMMFF release.


Single-valued attribute:

  * ``release``: CHARMMFF release in MonthYEAR format (e.g., "July2024", "February2026", etc.) (default: February2026)



Container-like attribute:

.. toctree::
   :maxdepth: 1

   charmmff/user_pdbcollections


Subattributes:

.. toctree::
   :maxdepth: 1

   charmmff/standard
   charmmff/custom
   charmmff/user_custom


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