def swo_speed_info(self):
        """Retrieves information about the supported SWO speeds.

        Args:
          self (JLink): the ``JLink`` instance

        Returns:
          A ``JLinkSWOSpeedInfo`` instance describing the target's supported
          SWO speeds.

        Raises:
          JLinkException: on error
        """
        info = structs.JLinkSWOSpeedInfo()
        res = self._dll.JLINKARM_SWO_Control(enums.JLinkSWOCommands.GET_SPEED_INFO,
                                             ctypes.byref(info))
        if res < 0:
            raise errors.JLinkException(res)

        return info