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【填空题】Complete the following short sentences by filling the blanks with the words or phrases given in the bracket chart, neglect, Alerting, range, distress initiates, uncertainty, ramps, activated, notify, negative 1. In controlled airspace, ________ service should be provided when the position of the aircraft is in doubt. 2. At _______ phase, the actual search mission is launched. 3. Upon issuing an ALNOT, first, the controller should plot the flight of the aircraft involved on a _________. It is crucial to determine the possible future position of the aircraft and its maximum ________ of action from the last known position. 4. At alert phase, the destination airport checks all ________ and hangers to locate the aircraft. 5. At alert phase, finally the ATS unit which________the alerting notice should announce the termination of the state of emergency. 6. Because of the high rate of false alarms, _________ phase is designed to determine if an aircraft is really missing or if a crew _________ to close their flight plan. If the PRECOM comes up________, then the next phase is ________. 7. In general, the ATS units shall __________ units providing alerting service in other affected FIRs or control areas of the emergency phase.
For conditions in problem 5. c) Assume we still use 64 KiB pages. The contents of the page map and TLB are shown to the right. The page map uses an LRU replacement policy and the LRU page (shown below) will be chosen for replacement. For each of these four accesses, compute its corresponding physical address and indicate whether the access causes a TLB miss and/or a page fault. Assume each access starts with the TLB and Page Map state shown to the right.
Fill in table below. Virtual Addr TLB Miss? (Y/N) Page Fault? (Y/N) 1. 0x06004 Q8 Q9 2. 0x30286 Q10 Q11 3. 0x68030 Q12 Q13 4. 0x4BEEF Q14 Q15 Q8. TLB Miss. True or False? ____
Assume a system that has: l A two-way set associate TLB l A TLB with 8 entries total l
-byte page size l
bytes of virtual memory TLB Index Tag Frame Number Valid 0 0x27 0xC6 1 0 0x29 0x73 1 1 0x11 0xFF 0 1 0x0A 0xEC 1 2 0x29 0xCD 1 2 0x3A 0xAB 1 3 0x32 0xFB 0 3 0x23 0x46 0 According to the TLB to fill in the table. Strike out anything that you don’t have enough information to fill in. If you don’t have enough information to fill the blank, fill the blank with “/”. Virtual Address Physical Address 0xA601 Q1.0x____
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