4.0 Functional Description
==========================

.. toctree::
    :glob:

    gf180mcu_fd_io__4_1.rst
    gf180mcu_fd_io__4_2.rst
    gf180mcu_fd_io__4_3.rst
    gf180mcu_fd_io__4_4.rst
    gf180mcu_fd_io__4_5.rst
    gf180mcu_fd_io__4_6.rst