部件概述图1示出外存储控制器(简称为外存控制器)的组成,它由通道接口、设备接口、数据处理部件和微程序控制部件组成。通道接口(GI)与通道通信。每台设备接口(DI)同接到外存控制器中的一台设备通信。数据处理部件(DPU)处理从指定设备来的数据信号,把数据信号从设备格式转换成通道能利用的数据,反之也一样。微程序控制部件(MGU)控制上述三个部件的动作。 Component Overview Figure 1 shows the composition of an external memory controller (referred to as an external memory controller) that consists of a channel interface, a device interface, a data processing unit, and a microprogram control unit. Channel Interface (GI) communicates with the channel. Each device interface (DI) communicates with a device connected to the memory controller. The Data Processing Unit (DPU) processes data signals from a given device and converts the data signals from device format into data that the channel can utilize, and vice versa. Microprocessor control unit (MGU) controls the operation of these three components.