What Is a Back-Side Bus?

Back side bus (BSB, Back Side Bus) refers to the data channel in the computer with L2 and L3 cache (Cache), responsible for data transfer between the central processing unit and external cache (often the second-level cache).

The back-side bus transfer rate is always higher than the front-side bus. The back-end bus for processing cached data actually runs at the CPU clock speed. In the mid-1990s, the back-end bus was an important path for keeping data moving.

L3 microkernel

A central processing unit (English: Central Processing Unit , abbreviation: CPU ) is one of the main devices of a computer. Its function is mainly to interpret computer instructions and process data in computer software. Computer programmability refers mainly to the programming of the central processing unit. The central processing unit, internal memory and input / output devices are the three core components of modern computers. Before the 1970s, the central processing unit was composed of multiple independent units. Later, the central processing unit manufactured by integrated circuits was developed. These highly shrinkable components are so-called microprocessors. Make a single tiny powerful unit.

A central processing unit refers broadly to a series of logical machines that can execute complex computer programs. This vague definition easily includes early computers before the name "CPU" was commonly used. In any case, since at least the early 1960s (Weik 1961), the name and its abbreviations have begun to be widely used in the computer industry. Although the "central processing unit" has made great progress in physical form, design, manufacturing, and execution of specific tasks compared to earlier periods, its basic operating principles have not changed. ^[2]