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Example SW/HW Model: System

Example SW/HW Model: System. System description:. Sensor input. Sensor Processing SW/HW. “UAH1” computer Software exists. Calibration Flag. Waits for input from sensor (sensor inputs provided each 2ms). When input is available, processes it (see SW description).

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Example SW/HW Model: System

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  1. Example SW/HW Model: System System description: Sensor input Sensor Processing SW/HW • “UAH1” computer • Software exists Calibration Flag Waits for input from sensor (sensor inputs provided each 2ms). When input is available, processes it (see SW description). Following processing, checks state of Calibration Flag; If flag is set, conducts calibration processing. (Calibration flag set each “c” ms where c is distributed as N(50,100), c>=20). After completion of sensor processing and calibration (if performed), waits for next sensor input. Purpose: Determine mean processor utilization and mean and max cycle time for 1,000 cycles.

  2. Example SW/HW Model: SW Sensor input Y i=1 to 10 Cal. Flag set N Process Sensor Data Part i 1000 FADD 2000 LD 2000 STO Cal Processing 500 FADD 500 FMULT 1000 STO Next i

  3. Example SW/HW Model: HW UAH1 Computer performance: LD 10 ns STO 12 ns FAAD 100 ns FMULT 300 ns

  4. Example SW/HW Model: Simplifying the model Sensor input Process Sensor data 10,000 FADD 20,000 LD 20,000 STO Y i=1 to 10 Cal. Flag set N Process Sensor Data Part i 1000 FADD 2000 LD 2000 STO Cal Processing 500 FADD 500 FMULT 1000 STO Next i

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