Obey the clock [Transport Embedded Systems]

Digital hardware design extends the idea of rigid time-slicing down to the nanosecond level. The approach restricts design flexibility and has resulted in more and more energy and design effort being applied to try to maintain a consistent clock from one side of a chip to another because the time it takes for electrons to cross a chip is often longer than the clock period itself. The design style is used almost everywhere in digital electronics because it greatly simplifies verification.