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8811-IO-DC燃機(jī)工控模塊
VME接口是Tundra Universe IIB芯片，它是VMEbus的PCI總線橋接設(shè)備。XVME-660實(shí)現(xiàn)32位PCI總線和32/64位VMEbus接口。通用芯片配置寄存器位于4 KB PCI塊中內(nèi)存空間。該內(nèi)存位置可編程，并由PCI配置定義循環(huán)。應(yīng)使用PCI中斷調(diào)用設(shè)置通用配置寄存器由BIOS提供。VMEbus主接口XVME-660可以通過(guò)訪問PCI從通道或通過(guò)DMA通道啟動(dòng)事務(wù)。Universe芯片包含八個(gè)PCI從映像。從屬圖像1和5具有4KB分辨率；其他的（2-4、6-8）具有64 KB決議從映像1到8已在XVME-660上實(shí)現(xiàn)VMEbus主機(jī)可以為每個(gè)PCI從映像生成A16、A24或A32個(gè)VMEbus周期。
XVME-660 BIOS從機(jī)1對(duì)應(yīng)于Tundra Universe從機(jī)0直到對(duì)應(yīng)于宇宙從機(jī)7的BIOS從機(jī)8。
地址模式和類型基于PCI從映像進(jìn)行編程。VMEbus主周期的PCI內(nèi)存地址位置由基地址和綁定地址指定。VME地址通過(guò)將基址添加到轉(zhuǎn)換偏移量來(lái)計(jì)算住址所有PCI從映像都位于PCI總線內(nèi)存空間中。
所有VMEbus主周期由Universe芯片進(jìn)行字節(jié)交換，以維護(hù)地址連貫性。有關(guān)Xycom自動(dòng)化軟件的更多信息，請(qǐng)選擇：XVME-660上的字節(jié)交換硬件，請(qǐng)參閱第74頁(yè)。
此配置適用于安裝了所有外圍設(shè)備的XVME-660模塊，擴(kuò)展模塊上的PMC卡除外。裝置當(dāng)啟動(dòng)時(shí)檢測(cè)到較少的設(shè)備時(shí)，可以移動(dòng)到不同的IRQ。通常，共享中斷的PCI設(shè)備將繼續(xù)共享打斷
1.如果操作系統(tǒng)或軟件不支持，串行和并行端口IRQ可用使用端口或不使用中斷。
2.如果上安裝了PMC卡，則以太網(wǎng)和PMC2位于IRQ5上XVME-660子板，否則它們?cè)贗RQ11上。
3.如果安裝了PMC卡，則PIIX4E、SCSI和PMC1位于IRQ11上在XVME-660子板上。如果沒有安裝PMC卡，PIIX4E和SCSI在IRQ5上。
4.如果啟動(dòng)時(shí)適配器中沒有小型閃存卡，則未檢測(cè)到輔助IDE控制器，PIIX4E將在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.
