BENTLY 3500/70M速度监测器
PCI设备PCI设备在I/O和/或内存地址空间下完全配置。表E-2描述了VMIVME-7740上的PCI总线设备以及每个设备的配置频谱。PCI总线包括三个物理地址空间。与ISA总线一样，PCI总线支持内存和I/O地址空间，但PCI总线包括一个额外的配置地址空间。该地址空间被定义为支持PCI总线硬件配置（有关配置地址空间的完整详细信息，请参阅PCI总线规范）。PCI总线目标需要在配置地址空间中实现基本地址寄存器以访问内部寄存器或功能。BIOS使用基本地址寄存器来确定设备在给定地址空间中需要多少空间，然后分配设备在该空间中的位置。此功能使PCI设备能够位于内存或I/O地址空间中。设备中断定义PC/AT中断定义VMIVME-7740上的中断硬件实现是围绕PC/AT架构构建的计算机的标准。PC/AT由IBM PC/XT体系结构演变而来。
PCI Devices PCI devices are fully configured under I/O and/or Memory address space. Table E-2 describes the PCI bus devices that are on-board the VMIVME-7740 along with each device’s configuration spectrum. The PCI bus includes three physical address spaces. As with ISA bus, PCI bus supports Memory and I/O address space, but PCI bus includes an additional Configuration address space. This address space is defined to support PCI bus hardware configuration (refer to the PCI bus Specification for complete details on the configuration address space). PCI bus targets are required to implement Base Address registers in configuration address space to access internal registers or functions. The BIOS uses the Base Address register to determine how much space a device requires in a given address space and then assigns where in that space the device will reside. This functionality enables PCI devices to be located in either Memory or I/O address space.Device Interrupt Definition PC/AT Interrupt Definition The interrupt hardware implementation on the VMIVME-7740 is standard for computers built around the PC/AT architecture. The PC/AT evolved from the IBM PC/XT architecture.
