D-Flipflop with combinational logic
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The following shows a combinational logic design driven by a clock. ``input wire a`` should be detected as a clock because it drives the flip flop.

.. symbolator:: ../../../tests/clocks/dff_comb_one_clock/dff_comb_one_clock.sim.v

.. verilog-diagram:: ../../../tests/clocks/dff_comb_one_clock/dff_comb_one_clock.sim.v
   :type: netlistsvg
   :module: BLOCK

|

.. literalinclude:: ../../../tests/clocks/dff_comb_one_clock/dff_comb_one_clock.sim.v
   :language: verilog
   :start-after:  */
   :caption: tests/clocks/dff_comb_one_clock/dff_comb_one_clock.sim.v

The ``is_clock`` attribute of the ``a`` port is set to 1, and the ports ``b``, ``c`` and ``d`` have their ``clock`` attribute set to ``a``.

.. literalinclude:: ../../../tests/clocks/dff_comb_one_clock/golden.model.xml
   :language: xml
   :caption: tests/clocks/dff_comb_one_clock/golden.model.xml