Ravel-XL is a single-board hardware accelerator for gate-level digital logic simulation. It uses a standard levelizedcode approach to statically schedule gate evaluations. However, unlike previous approaches based on levelized-code scheduling, it is not limited to zero-or unit-delay gate models and can provide timing accuracy comparable to that obtained from event-driven methods. We review the synchronous waveform algebra that forms the basis of the Ravel-XL simulation algorithm, present an architecture for its hardware realization, and describe an implementation of this architecture as a single VLSI chip. The chip has about 900 000 transistors on a die that is approximately 1.4 cm', requires a 256 pin package and is designed to run at 33 MHz. A Ravel-XL board consisting of the processor chip and local instruction and data memory can simulate up to one billion gates at a rate of approximately 6.6 million gate evaluations per second. To better appreciate the tradeoffs made in designing Ravel-XL, we compare its capabilities to those of other commercial and research software simulators and hardware accelerators.
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