message: bit_string: hex only for full valid values
diff: @@ -97,13 +97,13 @@ def bit_string(v, width, vld_mask=None):
  if vld_mask is None:
  vld_mask = all_mask
  - if vld_mask == 0:
  - if width % 4 == 0:
  - base = 16
  - bit_string = "".join(["x" for _ in range(width//4)])
  - else:
  - base = 2
  - bit_string = "".join(["x" for _ in range(width)])
  + # if vld_mask == 0:
  + # if width % 4 == 0:
  + # base = 16
  + # bit_string = "".join(["x" for _ in range(width//4)])
  + # else:
  + # base = 2
  + # bit_string = "".join(["x" for _ in range(width)])
  elif width % 4 == 0 and vld_mask == (1 << width) - 1:
  # hex full valid
  