Combinational Logic Unit implementation for the AHPL simulator HPSIM2

The use of Computer Hardware Description Languages plays an important role in the design automation process of digital systems. These languages help hardware engineers to provide a precise description of the internal structure of a system, and one of the most significant uses of these languages is as a means of input to a system simulator. AHPL is a hardware description language that describes a digital system as a set of modules and units. This language is supported by a function-level simulator (HPSIM2), but the simulator only provides support to the module descriptions of a system. This paper presents an improved version of the simulator that supports the use of unit descriptions called Combinational Logic Units or CLUNITs. The syntax and structure of a CLUNIT is analyzed, the operation and data structure of the simulator is given; and several examples are given to support these discussions