7EX484.50-1 总线控制器 定时控制

7EX484.50-1总线控制器是总线系统的核心，其主要任务是管理总线的使用，这包括总线上设备的管理以及设备使用总线的过程管理。总线控制器实现技术中，并不一定存在一个独立的控制器，它的功能可能分布到总线的各个部件或者各个设备上。
总线控制器的主要功能包括：
总线系统资源的管理：总线系统的资源主要有存储空间、设备端口空间、通道、中断等。总线控制器需要对这些资源进行分配，对资源冲突进行判定，同时负责设备的选择、启动、复位等功能。
总线系统的定时：无论是同步总线还是异步总线，系统都必须有定时控制。这包括产生各种总线命令和标识信号，协调设备的工作过程，辅助总线仲裁器工作，控制设备占用总线的时间，以及产生各种定时信号等。
另外，根据具体的总线类型和应用场景，总线控制器可能还具备其他特定的功能，如仲裁、错误检测与纠正等。
总线控制器在各种计算机和自动化系统中都有广泛的应用，例如，CAN总线控制器SJA1000就是用于实时应用的串行通讯协议总线，它可以使用双绞线来传输信号，是世界上应用最广泛的现场总线之一。

7EX484.50-1

7EX484.50-1 Bus controller is the core of the bus system, its main task is to manage the use of the bus, which includes the management of the device on the bus and the process management of the device using the bus. In the bus controller implementation technology, there is not necessarily an independent controller, its functions may be distributed to each part of the bus or each device.
The main functions of the bus controller include:
Management of bus system resources: the resources of the bus system mainly include storage space, device port space, channels, interrupts, etc. The bus controller needs to allocate these resources, determine resource conflicts, and be responsible for device selection, startup, reset and other functions.
Timing of the bus system: Whether it is a synchronous bus or an asynchronous bus, the system must have timing control. This includes generating various bus commands and identification signals, coordinating the working process of the device, assisting the work of the bus arbitrator, controlling the time that the device occupies the bus, and generating various timing signals.
In addition, depending on the specific bus type and application scenario, the bus controller may also have other specific functions, such as arbitration, error detection and correction.
Bus controllers are widely used in various computers and automation systems, for example, CAN bus controller SJA1000 is a serial communication protocol bus for real-time applications, it can use twisted pair to transmit signals, is one of the most widely used fieldbuses in the world.

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