VHDL, or VHSIC Hardware Description Language, is commonly used as a design-entry language for field-programmable gate arrays and application-specific integrated circuits in electronic design automation of digital circuits.
A formal definition of the general VHDL-AMS analogue system has been proposed to relate the way in which the language affects the specification of a non-linear discontinuous analogue system. It has been suggested to model the break set as a separate system in order to facilitate the interaction between the analogue equation set and the digital abstract machine. The significance of the proposed model is that it may be used in semantic validation of VHDL-AMS description and may also facilitate mixed-signal equation formulation for an underlying VHDL-AMS simulator
http://dmoz.org/Science/Technology/Electronics/Design/Hardware_Descrip
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