An external memory interface is a bus protocol for communication from an integrated circuit, such as a microprocessor, to an external memory device located on a circuit board.

Different buses and bus protocols have different ways of handling these four overlapping types of traffic.

Hardware transactional memory systems may comprise modifications in processors, cache and bus protocol to support transactions.

The bus protocol was also simplified to allow higher performance operation.

In terms of bus protocol, PCIe communication is encapsulated in packets.

Examples of bus protocols designed for this purpose are RapidIO and HyperTransport.

In an ideal world, there would be one primary type of bus and one bus protocol that connects all of these different I/O devices ?

Still, even though the utopian ideal of one bus and one bus protocol for every device will never be achieved, there has to be way bring some order to the chaos.

The token-passing bus protocol of that I/O device-sharing network was subsequently applied to allowing processing nodes to communicate with each other for file-serving and computing scalability purposes.

On one side, it drives and samples low-level signals according to the bus protocol.