.. this picture is generated by https://wavedrom.com/, using the sphinx plugin sphinxcontrib-wavedrom
.. due to plugin issue, we cannot place only the picture information in a standalone file, but have to take .. wavedrom:: inside

.. wavedrom:: 

    { signal: [
      { name: 'SCLK', 	wave: 'p...',  node: '.ad...' },
      { name: 'MISO', 	wave: 'x3x.',  node: '.b...', phase:-1.8 },
      { name: 'MISO delayed', 		wave: 'x3x.',  node: '.c.', phase:-2.4 },
      ],
      edge: [
        'a|->b input delay',
        'b|->c gpio delay',
      	'c-|>d setup slack'
      ],
      config: { hscale: 3 }
    }
