code: def refresh_toc(self, refresh_done_callback, toc_cache):
          
          self._useV2 = self.cf.platform.get_protocol_version() >= 4
          toc_fetcher = TocFetcher(self.cf, ParamTocElement,
                                   CRTPPort.PARAM, self.toc,
                                   refresh_done_callback, toc_cache)
          toc_fetcher.start()
docs: Initiate a refresh of the parameter TOC.