Abstract
In this paper, a finite state machine model of timing characteristics in computer control is presented. This model allows for a clear categorization of fundamental transient control mechanisms. The three fundamental categories are: synchronous control with constant cycle time, synchronous control with variable cycle time, and asynchronous control. Each category can be defined into subcategories by which a very wide range of particular timing characteristics can be modelled, e.g., machine subcycles, alternative synchronization mechanisms, etc. The subcategorise are defined by characteristic parameters which can easily be determined for a given microarchitecture. The model is envisioned on a basis for the incorporation of hardware timing characteristics into models of microinstruction semantics as used in the specification and artification as well as the construction and optimization of firmware.
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