数字设计原理与实践(二).DO NOT COPY2c h a p t e rDO NOT COPYNumber Systems andCodesDONOTigital systems are built from circuits that process binary digits―D0s and1s―yet very few real-life problems are based on binarynumbers or any numbers at all.Therefore,a digital systemdesigner must establish some correspondence between the bina-COPY ry digits processed by digital circuits andreal-life numbers,events,and conditions.The purpose of this chapter is to show you how familiar numeric quantities can be represented and manipul