 +_____________________________________________________________________
 ] AUTHOR:            ]                             ] DR:              ]
 ]  SHARON DEAN       ]    PASS PROGRAM NOTE        ]     55053        ]
 ]____________________]                             ]__________________]
 ] ORG/PHONE:         ] OPS NOTE ( )  USER NOTE (X) ] DATE: 10/08/86   ]
 ]  IBM/282-7364      ]      RELEASE NOTE( )        ] REV A: 06/21/89  ]
 ]____________________]_____________________________]__________________]
 ] OI/FLIGHT EFFECTIVITY:        ]  USER AFFECTED:                     ]
 ]   OI07 AND SUBS               ]  CREW ( )  GROUND (X)  DUMP ONLY ( )]
 ]_______________________________]_____________________________________]
 ]        MAJOR SOFTWARE AREA:       ] OPS MODES AFFECTED:             ]
 ]SSW ( )  GNC ( )  VU (X)  SM/PL ( )] G9, PL9                         ]
 ]_____________________________________________________________________]
 ] SOFTWARE SUB-AREA: DED-DISP, CYCLE-WRAP, SPEC, DOWNLIST, SPI        ]
 ]_____________________________________________________________________]
 ] PRINCIPAL FUNCTIONS:  V4.13                                         ]
 ]_____________________________________________________________________]
 ] TITLE:     DOWNLIST CYCLE WRAPS DURING DDU TESTS (HIGH, LOW, DRIVE) ]
 ]                                                                     ]
 ]_____________________________________________________________________]
 ] DESCRIPTION:                                                        ]
 ]                                                                     ]
 ]  EXECUTION OF THE HIGH, LOW, OR DRIVE DDU TESTS (ITEMS 20, 21,      ]
 ]  AND 24 ON SPEC 100) WHILE OTHER I/O PROCESSES ARE ENABLED (E.G.    ]
 ]  SRB I/O, HDA, OR LDB) MAY CAUSE DOWNLIST CYCLE WRAPS TO OCCUR.     ]
 ]                                                                     ]
 ]  THE PROBLEM ARISES FROM THE TEN DATA WRITES TO THE SPI DEVICE      ]
 ]  WHICH IS DONE AT A HIGHER PRIORITY THAN DOWNLIST PROCESSING.       ]
 ]  THE NUMEROUS SPI WRITES COUPLED WITH HDA, LDB, AND SRB I/O ARE     ]
 ]  ENOUGH ACTIVITY TO PREVENT DOWNLIST FROM COMPLETING RESULTING      ]
 ]  IN CYCLE WRAPS.                                                    ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]_____________________________________________________________________]
 ]USER RESPONSE:                                                       ]
 ]                                                                     ]
 ]  AVOID OR CANCEL ANY UNNECESSARY PROCESS THAT MAY BE RUNNING        ]
 ]  (E.G. SRB DATA COLLECTION).                                        ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]_____________________________________________________________________]
 ]CONCURRENCE:                           ]APPROVAL:                    ]
 ]IBM: WYATT COOPER         DATE 07/13/89]                             ]
 ]    --------------------      ---------]                             ]
 ]SSD: SAM ANKNEY           DATE 07/14/89]                             ]
 ]    --------------------      ---------] M.C. GREMILLION    08/20/89 ]
 ]PF MGR: ERIC C. BINGHAM   DATE 07/28/89]------------------- -------- ]
 ]       -----------------      ---------] CHAIRMAN, SASCB      DATE   ]
 ]_______________________________________]_____________________________]
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