3BDH000032R1卡件,ABB使用区域
一般说明MVME2700是一种VME模块单板计算机，配备PowerPC 750微处理器。所有版本的电路板都提供32KB L1缓存（1级缓存）和1MB二级缓存（2级背面缓存内存）。
如功能部分所示，MVME2700提供了许多标准配置计算机系统中需要的功能，例如：
❏ 同步和异步串行端口❏ 并行端口
❏ 启动ROM和DRAM❏ SCSI总线
❏ 以太网或AUI❏ 软驱、磁带机
❏ SCSI驱动器设备，内部/外部❏ 键盘和鼠标❏ 夹层结构允许灵活、轻松地升级内存和功能
3BDH000032R1卡件MVME2700系列的一个关键特性是PCI（外围组件互连）总线。除了车载本地总线外围设备外
PCI总线支持行业标准夹层接口IEEE P1386.1PMC（PCI夹层卡）。PMC模块提供了多种可能性对于通过FDDI（光纤分布式数据接口）的输入/输出扩展，ATM（异步传输模式）、图形、以太网或SCSI端口。这个基板支持PMC前面板输入/输出。还提供通过PMC载体板进行额外扩展。SCSI接口MVME2700 VME模块通过以下方式支持大容量存储子系统：行业标准SCSI总线。这些子系统可能包括硬件和软盘驱动器、流式磁带驱动器和其他大容量存储设备。SCSI接口使用Symbios 53C825A SCSI I/O实现控制器的时钟速度为40 MHz。SCSI输入/输出控制器连接直接连接到PCI本地总线。MVME712M兼容版本的MVME2700路由SCSI通过P2连接器连接至MVME712M过渡模块的线路。这个SCSI控制线路具有过滤网络，以最小化VMEbus的影响P2处的信号噪声。在MVME761兼容版本中，SCSI线路通过P2适配器板上的P2接头至接头J2。这个MVME761本身不支持SCSI，但是SCSI设备是通过使用包括的三排或五排适配器板来支持使用MVME761过渡板。SCSI总线在支持VME64扩展的系统中宽16位（配备5排160针VME背板连接器的）。这个SCSI总线在具有三行背板的VME系统中为8位宽。参考至MVME712M过渡模块和P2适配器板安装并使用手册指定上使用的SCSI连接器的引脚分配过渡模块。请参阅列出的Symbios 53C825A数据手册附录D中的相关文件，用于详细编程信息
General Description
The MVME2700 is a VME module single board computer equipped with
a PowerPC 750 microprocessor. All versions of the board offer 32KB L1
cache (Level 1 cache memory) and 1MB L2 cache (Level 2 backside cache
memory).
As shown in the Features section, the MVME2700 offers many standard
features desirable in a computer system, such as:
❏ Synchronous and asynchronous serial ports
❏ Parallel port
❏ Boot ROM and DRAM
❏ SCSI bus
❏ Ethernet or AUI
❏ Floppy drive, tape drive
❏ SCSI drive devices, internal/external
❏ Keyboard and mouse❏ Mezzanine architecture allows flexible, easy upgrades in memory
and functionality
A key feature of the MVME2700 family is the PCI (Peripheral Component
Interconnect) bus. In addition to the on-board local bus peripherals, the
PCI bus supports an industry-standard mezzanine interface, IEEE P1386.1
PMC (PCI Mezzanine Card). PMC modules offer a variety of possibilities
for I/O expansion through FDDI (Fiber Distributed Data Interface), ATM
(Asynchronous Transfer Mode), graphics, Ethernet, or SCSI ports. The
base board supports PMC front panel I/O. There is also provision for
additional expansion via a PMC carrier board.SCSI Interface
The MVME2700 VME module supports mass storage subsystems through
the industry-standard SCSI bus. These subsystems may include hard and
floppy disk drives, streaming tape drives, and other mass storage devices.
The SCSI interface is implemented using the Symbios 53C825A SCSI I/O
controller at a clock speed of 40 MHz. The SCSI I/O controller connects
directly to the PCI local bus.
MVME712M-compatible versions of the MVME2700 route the SCSI
lines through the P2 connector to the MVME712M transition module. The
SCSI control lines have filter networks to minimize the effects of VMEbus
signal noise at P2.
In the MVME761-compatible version, the SCSI lines are routed through
the P2 connector up to connector J2 on the P2 adapter board. The
MVME761 itself has no SCSI support, however, SCSI devices are
supported via the use of a three-row or five-row adapter board included
with the MVME761 transition board.
The SCSI bus is 16 bits wide in systems that support the VME64 extension
(those equipped with 5-row, 160-pin VME backplane connectors). The
SCSI bus is 8 bits wide in VME systems with three-row backplanes. Refer
to the MVME712M Transition Module and P2 Adapter Board Installation
and Use manual for the pin assignments of the SCSI connectors used on
the transition module. Refer to the Symbios 53C825A data manual, listed
in Appendix D, Related Documentation, for detailed programming
information.
