<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 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