dft_scan_segment                                   Specifies the order of
                                                   registers in a scan
                                                   chain.
 [ -scope ]                 scope                    design unit/ current scope
 [ scan_input ]                                      signal name
 object_list                                         variable[/L | /M ],
                                                     signal[/L | /M ],
                                                     process, instance_name/
                                                     chain_id_number
 [ scan_output ]                                     signal name
