{signal: [
  {name: 'clk', wave: 'p.', period: 8, phase: 7},
  {name: 'en', wave: '10.......'},
  {name: 'ctrl', wave: '1....0...'},
  {name: 'addr', wave: 'x2.......', data: ['0']},
  {name: 'd_in', wave: 'x2.......', data: ['0x12345678']},
  {name: 'stack[addr]', wave: 'x....2...', data: ['0x12345678']}
]}