Description
Crystal is a timing analyzer for nMOS circuits designed in the Mead-Conway style. Based on the circuit extracted from a mask set, Crystal determines the length of each clock phase and pinpoints the longest paths. The analysis is independent of specific data values and uses critical path techniques along with a simple RC model of delays. Several additional techniques are used to improve the speed and accuracy of the program, including separate up/down timing, static level assignment, flow control for pass transistors, and precharging.