- synchronous bus A bus used to interconnect devices that comprise a computer system where the timing of transactions between devices is under the control of a synchronizing clock signal.
- A device connected to a synchronous bus must guarantee to respond to a command within a period set by the frequency of the clock signal or a transmission error will occur.
- Such buses are usually employed in closely controlled processor backplane environments where device characteristics and interdevice signal delays are known.
In Synchronous data transfer, the sending and receiving units are enabled with same clock signal. It is possible between two units when each of them knows the behavior of the other. The master performs a sequence of instructions for data transfer in a predefined order. All these actions are synchronized with the common clock. The master is designed to supply the data at a time when the slave is definitely ready for it. Usually, the master will introduce sufficient delay to take into account the slow response of the slave, without any request from the slave.
