8502-BI-DP通用电气模块,GE使用数据
PCI仲裁MVME2700单板上有七个潜在的PCI总线主机计算机：❏ Raven ASIC（MPU/PCI总线桥控制器）❏ Winbond W83C553 PIB（PCI/ISA总线桥控制器）
❏ DEC芯片21140以太网控制器❏ SYM53C825A SCSI控制器
❏ Universe II ASIC（PCI/VME总线桥控制器）❏ PMC插槽1（PCI夹层卡）
8502-BI-DP通用电气模块❏ PMCspan（PCI扩展）Winbond W83C553 PIB设备提供PCI仲裁支持对于这七种类型的设备。PIB支持灵活的仲裁固定优先级、旋转优先级和混合优先级模式，如适用于给定应用。可以找到PCI仲裁的详细信息在MVME2600/2700系列单板计算机程序员参考指南。
MVME2700的仲裁分配如所示下表。中断处理Raven ASIC，控制PHB（PCI主机桥）MPU/本地总线MVME2700上的接口功能，执行以下中断处理：好中断源可以是以下任何一种：
❏ Raven ASIC本身（计时器或传输错误中断）❏ 处理器（处理器自中断）
❏ Falcon芯片组（内存错误中断）❏ PCI总线（来自PCI设备的中断）
❏ ISA总线（从ISA设备中断）下图说明了MVME2700上的中断架构。有关中断处理的详细信息，请参阅MVME2600/2700系列单板计算机程序员参考指南。直接通道PIB支持七个DMA通道。通道0到3支持8位DMA设备。通道5到7专用于16位DMA设备。信道分配如下：重置来源
MVME2700单板计算机有几个潜在的重置：
1、上电复位
2.重置开关（当MVME2700处于系统中时重置VMEbus）控制器）
3.SGS Thomson控制的看门狗定时器重置功能M48T559计时器设备（当MVME2700是系统控制器）4.ALT\u RST∗ 由PIB中的端口92寄存器控制的功能（当MVME2700是系统控制器时，重置VMEbus）5、由时钟除数寄存器控制的PCI/ISA输入/输出复位功能在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
