The updated IEEEinmade the syntax more consistent, allowed more flexibility in naming, extended the character type to allow ISO printable characters, added the xnor operator, etc. ISE Design Suiteĭue to the Department of Defense requiring as much of the syntax as possible to be based on Ada, in order to avoid re-inventing concepts that had already been thoroughly tested in the development of Ada, VHDL borrows heavily from the Ada programming language in both concept and syntax.Ī problem not solved by this edition, however, was "multi-valued logic", where a signal's drive strength none, weak or strong and unknown values are also considered. The next step was the development of logic synthesis tools that read the VHDL and output a definition of the physical implementation of the circuit. The idea of being able to simulate the ASICs from the information in this documentation was so obviously attractive that logic simulators were developed that could read the VHDL files. Department of Defense in order to document the behavior of the ASICs that supplier companies were including in equipment. VHDL can also be used as a general-purpose parallel programming language.
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