Abstract
The refinement of an implementation-independent specification of an instruction set to a simple pipelined architecture is presented to illustrate subtleties in the formal development and analysis of pipelined hardware from such specifications. The Event-B language and its tool support (the Eclipse-based Rodin platform) is used for this purpose. The example demonstrates that naïve use of Event-B's superposition refinement fails to expose all of the potential hazards in pipelining. This paper introduces a form of 'event merging' to complete the analysis.
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