We present a novel timing analysis method ACD that computes an approximate value for the delay of datapath circuits. Bused on the conditional delay matrix (CDM) formalism we introduced earliel; the ACD method exploits the fact that most datapath signals are directed by a small set of control inputs. The signal propagation conditions are restricted to a set of predefined control inputs, which results in SigniJicant reductions in the size of the conditions as well as computation time. We have implemented ACD and experimented with reverse-engineered high-level versions of the ISCAS-85 benchmarks. Our results demonstrate up to three orders of magnitude speedup in computation time over exact methods, with little or no loss in accuracy.
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