The purpose of Clocking in Modern VLSI Systems is to provide a concise exposition of all major issues in clocking large state-of-the-art microprocessors and SoCs. The issues covered include clock generation and distribution, clocking elements, testability, alternative clocking styles, special techniques, and dealing with scaling and process variation. This book provides in depth coverage of the various topics by well-known experts in industry and academia and will serve as a useful reference for practicing VLSI engineers, technical managers, and advanced graduate students.