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

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A Cx program is translated into an extended syntax graph from which a fine grain model is created which is suitable for partitioning and synthesis. Cx is used in the COSYMA system for system specification. COSYMA has the goal of implementing as much of the system as possible in software and only maps functionality into hardware, in the form of coprocessors, when timing constraints cannot be met. Hardware-C [40] is another example of an ANSI C based language. It is a synthesis oriented hardware description language that enables hardware to be described with declarative and procedural semantics, including the ability to formulate constraints on the hardware implementation.

Communication can be blocking (wait) and non blocking (receive) and data dependent loops are also available. A hierarchical flow graph model is used for partitioning, scheduling and synthesis in the Vulcan system [40]. Extended Syntax Graphs A Syntax graph is a directed acyclic graph describing a sequence of declarations, definitions and statements. Extended syntax graphs augment syntax graphs with a symbol table and local data and control dependencies. COSYMA [46], a design system for co-processor generation, uses extended syntax graphs as an internal representation.

SDL has two representation forms, textual and graphical, which enable SDL models to be created graphically and communicated textually to other tool environments. All communication in SDL is asynchronous, with blocking read, non blocking write and assumes the presence of infinite buffers. Synchronised Transitions The language Synchronised Transitions [104] implements a fine grained parallel model suitable for describing hardware and software components. g. Existing Approaches 31 << c > 0 → out, c:= true, c – 1 >> where c and out are state variables.

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