{"signal": [
  {"name": "clk",   "wave": "P................"},
  {"name": "ready", "wave": "0.....1...0...10."},
  {"name": "valid", "wave": "0..1....01.....0."},
  {},
  {"name": "data",  "wave": "x..2...3x45....x.", "data": ["d0", "d1", "d2", "d3"]}
]}