IC693BEM331M  GE Fanuc

I/O bus/Genius bus controller

The IC693BEM331M bus controller is the core of the bus system, its main task is to manage the use of the bus, including the management of the device on the bus and the process management of the device using the bus.

The bus controller is a concept in logic, and there is not necessarily an independent physical controller, whose functions may be distributed to various parts of the bus or devices.

The main functions of the IC693BEM331M bus controller include:

Management of bus system resources: The resources of the IC693BEM331M bus system mainly include storage space, device port space, channels, interrupts, etc. The bus controller needs to allocate these resources, resolve resource conflicts, and select, start, and reset devices.

Timing control of IC693BEM331M bus: Whether it is a synchronous bus or an asynchronous bus, the system needs timing control. This involves generating bus commands and identification signals, coordinating the work process of the device, assisting the work of the bus arbitrator, and controlling the time that the device occupies the bus.

Bus arbitration: When multiple devices request to use the bus at the same time, the bus controller needs to arbitrate to determine which device can get the bus first.

Bus connection and protocol conversion: For the case of multiple buses in the system, the bus controller needs to complete the conversion between different bus protocols; For systems with multiple buses, the bus controller also needs to complete the connection between these buss1.

Bus controllers are used in a variety of bus standards and systems, such as ISA bus, MCA bus, EISA bus, etc. They are all standard buses in computer systems, and the bus controller is responsible for managing and coordinating the use of these busses.1