Abstract
The paper discusses general issues related to formal requirements specification of real time embedded systems. It characterizes the distinguishing features of embedded systems and then presents the role of requirements specifications and emphasises the need for their formality. The formal specifications are considered from the system analyst perspective. It is argued that functionality, parallelism and timing are the relevant aspects of requirements of embedded systems. The basic semantic concepts related to formal specification of those aspects are briefly reviewed and evaluated. It is demonstrated how a global state model can be developed to specify requirements for a simple example system using the temporal logic (property-oriented) and Petri net (state transition-oriented) approaches. Brief characteristic of some distributed state models is also included.
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