Bus and Memory Transfers

A typical digital computer has many register and paths must be provided to transfer information from one register to another . The number of wires will be excessive if seperate lines are used between each register and all other registers in the system.A more efficien scheme for transferring information between registers in a multiple register configuration is a common bus system. A bus structure consists of a set of common lines one for each bit of aregister, through which binary informatio is transferred one at  a time .control signals determine which register is selected by the bus during each particular register transfer.
one way of constructing a common bus system is with multiplexers.The multiplexers select the source registre whose binary information is then placed on the bus.