code: def block1(self, value):
          
          option = Option()
          option.number = defines.OptionRegistry.BLOCK1.number
          num, m, size = value
          if size > 512:
              szx = 6
          elif 256 < size <= 512:
              szx = 5
          elif 128 < size <= 256:
              szx = 4
          elif 64 < size <= 128:
              szx = 3
          elif 32 < size <= 64:
              szx = 2
          elif 16 < size <= 32:
              szx = 1
          else:
              szx = 0
  
          value = (num << 4)
          value |= (m << 3)
          value |= szx
  
          option.value = value
          self.add_option(option)
docs: Set the Block1 option.
  
          :param value: the Block1 value