GD9924BE V2模拟量模块,ABB如何使用
磁盘驱动器控制器ISASIO器件采用PS/2兼容的低密度和高密度器件与可选外部磁盘驱动器一起使用的磁盘驱动器控制器。驱动器通过基板连接器J4与ISASIO控制器接口，该连接器继电器电源和控制信号。ISASIO磁盘驱动器控制器与DP8473、765A、，和通常用于实现软盘控制器的N82077设备。
GD9924BE V2模拟量模块为这些设备编写的软件可以在不改变操作的情况下使用ISASIO控制器。ISASIO设备可用于支持任何以下设备：❏ 31/2英寸1.44MB软盘驱动器❏ 51/4英寸1.2MB软盘驱动器
❏ 标准250kbps至2Mbps磁带机系统键盘和鼠标界面国家半导体PC87308 ISASIO芯片用于实现P2和前面板输入/输出的某些部分提供基于ROM的键盘和鼠标界面控制。的前面板MVME2603/2604板有两个6针圆形DIN连接器，用于键盘和鼠标连接。
PCI-ISA桥（PIB）控制器MVME2603/2604使用Winbond W83C553桥接控制器来提供PCI本地总线和ISA系统输入/输出总线之间的接口（如第1章硬件准备和安装）。PIB控制器提供以下功能：❏ PCI总线仲裁：–ISA（工业标准架构）总线DMA–PHB（PCI主机桥）MPU/本地总线接口功能，由Raven ASIC实现–所有车载PCI设备–PMC（PCI夹层卡）插槽❏ DMA的ISA（工业标准架构）总线仲裁设备
❏ 四个PCI中断的ISA中断映射
❏ 中断控制器功能支持14个ISA中断
❏ ISA中断的边缘/电平控制
❏ 七个独立可编程DMA通道
❏ 一个16位计时器
❏ 三个间隔计数器/计时器
Disk Drive Controller
The ISASIO device incorporates a PS/2-compatible low- and high-density
disk drive controller for use with an optional external disk drive. The drive
interfaces with the ISASIO controller via base board connector J4, which
relays both power and control signals.
The ISASIO disk drive controller is compatible with the DP8473, 765A,
and N82077 devices commonly used to implement floppy disk controllers.
Software written for those devices may be used without change to operate
the ISASIO controller. The ISASIO device may be used to support any of
the following devices:
❏ 31
/2-inch 1.44MB floppy disk drive
❏ 51
/4-inch 1.2MB floppy disk drive
❏ Standard 250kbps to 2Mbps tape drive system
Keyboard and Mouse Interface
The National Semiconductor PC87308 ISASIO chip used to implement
certain segments of the P2 and front-panel I/O provides ROM-based
keyboard and mouse interface control. The front panel of the
MVME2603/2604 board has two 6-pin circular DIN connectors for the
keyboard and mouse connections.
PCI-ISA Bridge (PIB) Controller
The MVME2603/2604 uses a Winbond W83C553 bridge controller to
supply the interface between the PCI local bus and the ISA system I/O bus
(diagrammed in Figure 1-1 in Chapter 1, Hardware Preparation and
Installation).The PIB controller provides the following functions:
❏ PCI bus arbitration for:
– ISA (Industry Standard Architecture) bus DMA
– The PHB (PCI Host Bridge) MPU/local bus interface function,
implemented by the Raven ASIC
– All on-board PCI devices
– The PMC (PCI Mezzanine Card) slot
❏ ISA (Industry Standard Architecture) bus arbitration for DMA
devices
❏ ISA interrupt mapping for four PCI interrupts
❏ Interrupt controller functionality to support 14 ISA interrupts
❏ Edge/level control for ISA interrupts
❏ Seven independently programmable DMA channels
❏ One 16-bit timer
❏ Three interval counters/timers
