Modelling and refinement in CODA

Abstract

This paper provides an overview of the CODA framework for modelling and refinement of componentbased embedded systems. CODA is an extension of Event-B and UML-B and is supported by a plugin for the Rodin toolset. CODA augments Event-B with constructs for component-based modelling including components, communications ports, port connectors, timed communications and timing triggers. Component behaviour is specified through a combination of UML-B state machines and Event-B. CODA communications and timing are given an Event-B semantics through translation rules. Refinement is based on Event-B refinement and allows layered construction of CODA models in a consistent way.