Spice has long been a favored tool for pc-board signal-integrity signoff, but it's always possible to improve on a good thing. To that end, Synopsys and SiSoft have integrated the former's HSpice simulator with the latter's Quantum-SI tool. The combo automates the analysis of entire digital interfaces for both timing and signal integrity. Further, Quantum-SI leverages computer server farms to run HSpice's highaccuracy simulations in parallel, increasing analytical throughput. The result is a comprehensive design and analysis environment for pre-and post-route analysis that lets users seamlessly mix IBIS and transistor-level models.