1.9.1 เส้นทาง Cycle
In a เส้นทาง based computer, communication between the CPU and other subsystems take place on the bus.
A clearly defined protocol is followed on the bus so that there is no clash or interference from other subsystems when the CPU is communicating with any one subsystems. Normally the CPU is the เส้นทาง master which can initiate a communication sequence whenever it wants. A sequence of events performed on the เส้นทาง for transfer of one byte (word) through the data เส้นทาง is called a เส้นทาง cycle. There are four major types of เส้นทาง cycles :