The software technology consisted in partitioning a design among the many processors and scheduling individual Boolean operations in the correct time sequence and in an optimal way. The hardware technology consisted of a massive array of Boolean processors able to share data with one another, running at very high speed. In the early 1990's IBM pioneered processor-based emulation technology, which was an offshoot of earlier work they had done in hardware-based simulation engines. This article will attempt to remove the mystery explaining how processor-based emulation works and how design constructs are mapped into it, such as tri-state busses, complex memories, and asynchronous clocking. Much less well understood are processor-based emulators, and ample examples of misinformation abound. FPGA-based emulation is more widely understood by engineers because engineers are used to designing with FPGAs.
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