1 Each term should be used in one and only one way throughout the dissertation.  The easiest way to avoid a long series of definitions is to include a statement: ``the terminology used throughout this document follows that given in [CITATION].'' Then, only define exceptions.
Serial Peripheral Interface Bus. The Serial Peripheral Interface bus (SPI) is a synchronous serial communication interface specification used for short distance communication, primarily in embedded systems. The interface was developed by Motorola in the late 1980s and has become a de facto standard. Typical applications include Secure Digital cards and liquid crystal displays.
Definition of:bus. A shared digital pathway between resources and devices. In a computer, there are two major types: the system bus and peripheral bus. The system bus, also known as the frontside bus or local bus, is the internal path from the CPU to memory and is split into address bus and data bus subsets.