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Extra info for An Object Oriented Petri Net Approach to Embedded System Design (Tik-Schriftenreihe) English

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Figure 15 taken from [85] shows a data flow diagram for a display controller. Here the three processes are abstract and are subject to further decomposition. Existing Approaches 45 Copier Copier Pixels Copy Control Keyboard Copy Display 2 Characters Parse KB Characters Screen 1 Control Command String Main CPU Display Primitives Mouse Generate Bit Map 3 Pixel Pixel Address Bit Map Pixel Pos FIGURE 15. SA Data Flow Diagram for a display controller with data flow shown as arcs between processes (circles), interfaces (boxes) and data stores (double bars).

S1 s2 Control Temperature temperature temperature trigger enable disable Maintain Temperature Record Temperature Value heater control Temperature History FIGURE 16. Part of a structured development system model. This approach is interesting as it combines event based and transformational modelling in a single representation. System models are semi formal, as executable models are not created and only basic consistency checks are possible. A proposal to formalise this approach with an executable model based on Petri nets is described in [97].

As a result of a state-transition occurring, messages can be sent, and the extended state (not explicitly defined in the ROOMChart) of an actor modified through the execution of functions. Associated with ROOM is a suggested design methodology: 1. define the system and its boundary with the environment. This boundary may change during the course of developing a system if, for example, more intelligence is delegated to the input sensors and output actuators; 2. formulate scenarios [99], equivalent to Use Case Analysis [68], that the system must implement.

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