How does top-down timing design differ from back-end timing analysis?
The key feature of a top-down timing design methodology is an up-front analysis of system timing (usually using timing diagrams) right at the beginning of the design cycle, where errors can be quickly corrected. Back-end timing analyzers such as digital simulators and static timing analyzers require the designer to have already committed to a specific circuit implementation, which is usually specified as a schematic or HDL netlist with associated simulation models. This requirement for a nearly completed design prior to beginning timing analysis means that any timing errors discovered during a back-end analysis may result in a significant redesign effort. In addition, when timing or logic errors are found at this stage, any circuit changes must be reflected in many different places: the schematic, model descriptions, testbench stimulus for the simulator or timing analyzer, and documentation accompanying the design. Top-down timing design helps the designer discover timing errors earlie
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