8502-BI-DP通用電氣模塊,GE使用數(shù)據(jù)
PCI仲裁MVME2700單板上有七個潛在的PCI總線主機(jī)計(jì)算機(jī)：? Raven ASIC（MPU/PCI總線橋控制器）? Winbond W83C553 PIB（PCI/ISA總線橋控制器）
? DEC芯片21140以太網(wǎng)控制器? SYM53C825A SCSI控制器
? Universe II ASIC（PCI/VME總線橋控制器）? PMC插槽1（PCI夾層卡）
8502-BI-DP通用電氣模塊? PMCspan（PCI擴(kuò)展）Winbond W83C553 PIB設(shè)備提供PCI仲裁支持對于這七種類型的設(shè)備。PIB支持靈活的仲裁固定優(yōu)先級、旋轉(zhuǎn)優(yōu)先級和混合優(yōu)先級模式，如適用于給定應(yīng)用?？梢哉业絇CI仲裁的詳細(xì)信息在MVME2600/2700系列單板計(jì)算機(jī)程序員參考指南。
MVME2700的仲裁分配如所示下表。中斷處理Raven ASIC，控制PHB（PCI主機(jī)橋）MPU/本地總線MVME2700上的接口功能，執(zhí)行以下中斷處理：好中斷源可以是以下任何一種：
? Raven ASIC本身（計(jì)時器或傳輸錯誤中斷）? 處理器（處理器自中斷）
? Falcon芯片組（內(nèi)存錯誤中斷）? PCI總線（來自PCI設(shè)備的中斷）
? ISA總線（從ISA設(shè)備中斷）下圖說明了MVME2700上的中斷架構(gòu)。有關(guān)中斷處理的詳細(xì)信息，請參閱MVME2600/2700系列單板計(jì)算機(jī)程序員參考指南。直接通道PIB支持七個DMA通道。通道0到3支持8位DMA設(shè)備。通道5到7專用于16位DMA設(shè)備。信道分配如下：重置來源
MVME2700單板計(jì)算機(jī)有幾個潛在的重置：
1、上電復(fù)位
2.重置開關(guān)（當(dāng)MVME2700處于系統(tǒng)中時重置VMEbus）控制器）
3.SGS Thomson控制的看門狗定時器重置功能M48T559計(jì)時器設(shè)備（當(dāng)MVME2700是系統(tǒng)控制器）4.ALT\u RST? 由PIB中的端口92寄存器控制的功能（當(dāng)MVME2700是系統(tǒng)控制器時，重置VMEbus）5、由時鐘除數(shù)寄存器控制的PCI/ISA輸入/輸出復(fù)位功能在PIB中
PCI Arbitration
There are seven potential PCI bus masters on the MVME2700 single board
computer:
? Raven ASIC (MPU/PCI bus bridge controller)
? Winbond W83C553 PIB (PCI/ISA bus bridge controller)
? DECchip 21140 Ethernet controller
? SYM53C825A SCSI controller
? Universe II ASIC (PCI/VME bus bridge controller)
? PMC Slot 1 (PCI mezzanine card)
? PMCspan (PCI expansion)
The Winbond W83C553 PIB device supplies the PCI arbitration support
for these seven types of devices. The PIB supports flexible arbitration
modes of fixed priority, rotating priority, and mixed priority, as
appropriate in a given application. Details on PCI arbitration can be found
in the MVME2600/2700 Series Single Board Computer Programmer’s
Reference Guide.
The arbitration assignments for the MVME2700 are shown in the
following table.Interrupt Handling
The Raven ASIC, which controls PHB (PCI Host Bridge) MPU/local bus
interface functions on the MVME2700, performs interrupt handling as
well. Sources of interrupts may be any of the following:
? The Raven ASIC itself (timer or transfer error interrupts)
? The processor (processor self-interrupts)
? The Falcon chip set (memory error interrupts)
? The PCI bus (interrupts from PCI devices)
? The ISA bus (interrupts from ISA devices)
The following figure illustrates interrupt architecture on the MVME2700.
For details on interrupt handling, refer to the MVME2600/2700 Series
Single Board Computer Programmer’s Reference Guide.DMA Channels
The PIB supports seven DMA channels. Channels 0 through 3 support
8-bit DMA devices. Channels 5 through 7 are dedicated to 16-bit DMA
devices. The channels are allocated as follows:
Sources of Reset
The MVME2700 single board computer has several potential sources of
reset:
1. Power-on reset
2. RESET switch (resets the VMEbus when the MVME2700 is system
controller)
3. Watchdog timer Reset function controlled by the SGS-Thomson
M48T559 timekeeper device (resets the VMEbus when the
MVME2700 is system controller)
4. ALT_RST? function controlled by the Port 92 register in the PIB
(resets the VMEbus when the MVME2700 is system controller)
5. PCI/ISA I/O Reset function controlled by the Clock Divisor register
in the PIB
