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8811-IO-DC燃机工控模块
VME接口是Tundra Universe IIB芯片，它是VMEbus的PCI总线桥接设备。XVME-660实现32位PCI总线和32/64位VMEbus接口。通用芯片配置寄存器位于4 KB PCI块中内存空间。该内存位置可编程，并由PCI配置定义循环。应使用PCI中断调用设置通用配置寄存器由BIOS提供。VMEbus主接口XVME-660可以通过访问PCI从通道或通过DMA通道启动事务。Universe芯片包含八个PCI从映像。从属图像1和5具有4KB分辨率；其他的（2-4、6-8）具有64 KB决议从映像1到8已在XVME-660上实现VMEbus主机可以为每个PCI从映像生成A16、A24或A32个VMEbus周期。
XVME-660 BIOS从机1对应于Tundra Universe从机0直到对应于宇宙从机7的BIOS从机8。
地址模式和类型基于PCI从映像进行编程。VMEbus主周期的PCI内存地址位置由基地址和绑定地址指定。VME地址通过将基址添加到转换偏移量来计算住址所有PCI从映像都位于PCI总线内存空间中。
所有VMEbus主周期由Universe芯片进行字节交换，以维护地址连贯性。有关Xycom自动化软件的更多信息，请选择：XVME-660上的字节交换硬件，请参阅第74页。
此配置适用于安装了所有外围设备的XVME-660模块，扩展模块上的PMC卡除外。装置当启动时检测到较少的设备时，可以移动到不同的IRQ。通常，共享中断的PCI设备将继续共享打断
1.如果操作系统或软件不支持，串行和并行端口IRQ可用使用端口或不使用中断。
2.如果上安装了PMC卡，则以太网和PMC2位于IRQ5上XVME-660子板，否则它们在IRQ11上。
3.如果安装了PMC卡，则PIIX4E、SCSI和PMC1位于IRQ11上在XVME-660子板上。如果没有安装PMC卡，PIIX4E和SCSI在IRQ5上。
4.如果启动时适配器中没有小型闪存卡，则未检测到辅助IDE控制器，PIIX4E将在IRQ15上。
The VME interface is the Tundra Universe IIB chip, which is a PCI bus-to-VMEbus
bridge device. The XVME-660 implements a 32-bit PCI bus and a 32/64-bit VMEbus interface. The Universe chip configuration registers are located in a 4 KB block of PCI
memory space. This memory location is programmable and defined by PCI configuration
cycles. The Universe configuration registers should be set up using PCI interrupt calls
provided by the BIOS. VMEbus Master Interface
The XVME-660 can act as a VMEbus master by accessing a PCI slave channel or by the
DMA channel initiating a transaction. The Universe chip contains eight PCI slave images. Slave images 1 and 5 have a 4 KB resolution; the others (2-4, 6-8) have a 64 KB
resolution. Slave images 1 through 8 have been implemented on the XVME-660. The
VMEbus master can generate A16, A24, or A32 VMEbus cycles for each PCI slave image.
Note
XVME-660 BIOS Slave 1 corresponds to Tundra Universe Slave 0 and
so on, up to BIOS Slave 8 corresponding to Universe Slave 7.
The address mode and type are programmed on a PCI slave image basis. The PCI memory address location for the VMEbus master cycle is specified by the base and bound address. The VME address is calculated by adding the base address to the translation offset
address. All PCI slave images are located in the PCI bus memory space.
All VMEbus master cycles are byte-swapped by the Universe chip to maintain address
coherency. For more information on the Xycom Automation software selectable
byte-swapping hardware on the XVME-660, refer to p. 74.
This configuration is for an XVME-660 module with all peripheral devices installed, except for a PMC card on an expansion module. Devices
may move to different IRQs when fewer devices are detected on startup.
In general, PCI devices that share an interrupt will continue to share an
interrupt.
1Serial and parallel port IRQs are available if the OS or software does not
use the ports or does not use the interrupt.
2Ethernet and PMC2 are on IRQ5 if there is a PMC card installed on the
XVME-660 daughterboard, otherwise they are on IRQ11.
3PIIX4E, SCSI, and PMC1 are on IRQ11 if there is a PMC card installed
on the XVME-660 daughterboard. If there is no PMC card installed,
PIIX4E and SCSI are on IRQ5.
4If there is no Compact Flash card in the adapter on startup, the Secondary IDE controller is not detected and PIIX4E will be on IRQ15.
