{
  signal: [
    {name: 'clk', wave: 'p...|....'},
    {},
    ['input port', 
      {name: 'addr',  wave: 'x3x.|....', data: ['A0']},
      {name: 'data',  wave: 'x5x.|....', data: ["D0"]},
      {name: 'rw',    wave: 'x1x.|....'},
      {name: 'valid', wave: '010.|....'}, 
    ],

     {}, {},

    ['output port', 
      {name: 'addr',  wave: 'x...|.3x.', data: ['A0']},
      {name: 'data',  wave: 'x...|.5x.', data: ['D0']},
      {name: 'rw',    wave: 'x...|.1x.'},
      {name: 'valid', wave: '0...|.10.'}, 
    ],

     {}, {},

  ],
  head: {text: 'Write Transaction'},
  config: {hscale: 1}
}