What is a crossbar switch?
A crossbar switch as part of a crossbar topology channels data or signals between two different points in a network. The crossbar setup is a matrix where each crossbar switch runs between two points, in a design that is supposed to connect every part of an architecture to every other part. Crossbar design can be used in networking and in building chips or electronic setups.
In chip design, crossbar switches replaced a traditional bus system that made linear connections. By switching from a linear connection to a matrix connection, crossbar setups revolutionized the capacity of these systems and reduced latency and bottlenecks. Now a system called 'network on chip' has replaced both bus and crossbar designs.
When changing the crossbar network, crossbar connections can be activated or deactivated or opened for a certain period of time. As with other types of crossbar setups, the crossbar network topology allows for more flexible data transfer protocols and can improve network performance over a bus system.
The crossbar design has also been useful in the design of solid state chips and memory systems for devices.