real time systems design and analysis phần 4 ppt

... account for system dynamics and use if for the specification of real- time systems. These approaches include Gomaa’s DARTS (design approach for real- time systems) [Gomaa00]. Ward and Mellor extended data ... case, UML largely enjoys the benefits of both informal and formal techniques and is widely used in real- time systems specifications and design. 4. 4 FORMAL METHO...

Ngày tải lên: 13/08/2014, 08:20

... including image processing, avionics systems, and medical systems, and the real- time design issues are the same for them as they are for most other systems. 44 2 HARDWARE CONSIDERATIONS FFFFFFFF FFFFFF00 FFFFFE00 FFC00000 DMA Memory-mapped ... up to 64 megabytes with read/write 40 nanosecond access time and 1.5/1.5 read/write voltage 2 .4. 3 Memory Hierarchy Primary and...

Ngày tải lên: 13/08/2014, 08:20

... 340 6.5.6 Java / 341 6.5.7 Occam 2 / 345 6.5.8 Special Real- Time Languages / 346 6.5.9 Know the Compiler and Rules of Thumb / 346 6.6 Coding Standards / 347 6.7 Exercises / 349 7 Performance Analysis ... Performance Analysis / 357 7.2.1 Code Execution Time Estimation / 357 7.2.2 Analysis of Polled Loops / 3 64 7.2.3 Analysis of Coroutines / 3 64 7.2 .4 Analysis of...

Ngày tải lên: 13/08/2014, 08:20

... or combination systems, although it is generally 130 3 REAL- TIME OPERATING SYSTEMS internal and external fragmentation hamper efficient memory usage and ulti- mately degrade real- time performance ... full-featured, real- time operating systems because the number of real- time tasks can vary. This architecture is used in interactive on-line systems where tasks (associat...

Ngày tải lên: 13/08/2014, 08:20

... outstanding commercial software. Real- time engineers know that their systems are frequently subject to changes in hardware, algorithms, and even application. Therefore these systems must be designed ... presence pulse width. Vmin Vmin = 10 mph 2′ 4 4 4 4 1′ 1′ NOT PRESENT PRESENT D = 3 ft V max = 10 mph = 14. 7 ft/s T gap = D / V max = (3 ft)/( 14. 7 ft/s) = 2 04. 5 ms T gap =...

Ngày tải lên: 13/08/2014, 08:20

... 17:12: 04 Updated: 05-Dec-2002 19 :49 :42 phaseTimerExpired 1 phaseTimerExpired 2 phaseTimerExpired 3 /lastPhase = FALSE phaseTimerExpired 4 phaseTimerExpired 5 phaseTimerExpired 6 phaseTimerExpired ... Figure 4 through Figure 9. 2 64 5 SOFTWARE SYSTEM DESIGN Same messages as between m_VehicleTrafficStandard[0] and m_Approach[0]. Same messages as between m_PedestrianTrafficStandard...

Ngày tải lên: 13/08/2014, 08:20

... Log 3.3.1.1, Table 14 (13) 3.3.1 .4, Figur e 13 Set Phase 3.3.1.1, Table 14 ( 14) 3.3.1 .4, Figur e 13 Get Phase 3.3.1.1, Table 14 (15) 3.3.1 .4, Figur e 13 Check Phase 3.3.1.1, Table 14 (16) 3.3 .4. 4, Figur ... Table 14 (1) 3.3.1 .4, Figure 13 Initialization 3.3.1.1, Table 14 (2) 3.3.1 .4, Figure 13 Set Default Phase 3.3.1.1, Table 14 (3) 3.3.1 .4, Figure 13 Start Normal Operation 3....

Ngày tải lên: 13/08/2014, 08:20

... */ time1 =current_clock _time( ); loop _time= time1 -time0 ; /* open loop time */ time2 =current_clock _time( ); /* read time now */ for (i=1;i<=iteration;i++) * time function */ function_to_be_timed(); time3 =current_clock _time( ); ... code to be timed is placed. #include system.h unsigned long timer(void) { unsigned long time0 ,time1 ,i,j ,time2 ,total _time, time3, iteration=...

Ngày tải lên: 13/08/2014, 08:20

... Press, Boca Raton, FL, 2001. Real- Time Systems Design and Analysis, By Phillip A. Laplante ISBN 0 -47 1-22855-9  20 04 Institute of Electrical and Electronics Engineers 44 5 42 0 8 ENGINEERING CONSIDERATIONS The ... 8. 14: A = 0 .4 (% design modified) + 0.03 (% code modified) + 0.3 (% integration modified) (8. 14) For new components A = 100. On the other hand, if all of the...

Ngày tải lên: 13/08/2014, 08:20

... (SA): defined, 240 problems in real- time applications, 244 – 245 real- time extensions of, 245 structured design, transition to, 240 – 242 Structured analysis and design (SASD), 178–180, 244 – 245 , 253 Structured ... 153–1 54 clocks and timers, 149 –153 condition variables, 142 – 143 memory locking, 1 54 156 messages, 145 – 148 mutex variables, 142 – 143 naming scheme...

Ngày tải lên: 13/08/2014, 08:20