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.
The ``SCSI bus'' transfers data and state information between interconnected SCSI devices. A single transaction between an ``initiator'' and a ``target'' can involve up to 8 distinct ``phases.'' These phases are almost entirely determined by the target (e.g., the hard disk drive).