A Component-based Approach to Embedded Software Design

Síntese de Software Adaptativo baseada em Especificações, Extended Dataflow

“…This section presents a heterogeneous model called Extended Dataflow (XDF) (Polato andSilva Filho, 2003, 2005) which has been applied to embedded software. The reader is referred to (Polato, 2004;Silva Filho, 2004) for further details. This model is an extension of the DF model (Dennis, 1974;Davis and Keller, 1982;Ackerman, 1982).…”

“…Event handling is done according to the time associated to the event, i.e., in agreement with a global timeline within the system. XDF has been used in embedded software development, mainly in adaptative DSP applications involving digital filters and speech compression (Polato and Silva Filho, 2003;Polato, 2004). To support specifications of software using the XDF model, a model specification has been developed.…”

“…A generic XDF model spec is shown in Listing 1. Due to its flexibility and extensibility, XML language has been chosen to describe XDF model spec (Silva Filho, 2004). XML also provides means to support the XDF syntax through schemas.…”

“…In addition, an operational semantics has been developed avoiding inconsistency during the execution of the model. Further details can be found in (Polato, 2004).…”

“…Within this context, this paper presents a heterogeneous model of computation called Extended Dataflow (XDF) (Polato, 2004), which is an extension of the original dataflow model (Dennis, 1974;Davis and Keller, 1982;Ackerman, 1982) with additional support to event handling. This model has been applied to digital signal processing (DSP) applications.…”