3BDH000032R1卡件,ABB使用區(qū)域
一般說明MVME2700是一種VME模塊單板計算機，配備PowerPC 750微處理器。所有版本的電路板都提供32KB L1緩存（1級緩存）和1MB二級緩存（2級背面緩存內(nèi)存）。
如功能部分所示，MVME2700提供了許多標(biāo)準(zhǔn)配置計算機系統(tǒng)中需要的功能，例如：
? 同步和異步串行端口? 并行端口
? 啟動ROM和DRAM? SCSI總線
? 以太網(wǎng)或AUI? 軟驅(qū)、磁帶機
? SCSI驅(qū)動器設(shè)備，內(nèi)部/外部? 鍵盤和鼠標(biāo)? 夾層結(jié)構(gòu)允許靈活、輕松地升級內(nèi)存和功能
3BDH000032R1卡件MVME2700系列的一個關(guān)鍵特性是PCI（外圍組件互連）總線。除了車載本地總線外圍設(shè)備外
PCI總線支持行業(yè)標(biāo)準(zhǔn)夾層接口IEEE P1386.1PMC（PCI夾層卡）。PMC模塊提供了多種可能性對于通過FDDI（光纖分布式數(shù)據(jù)接口）的輸入/輸出擴展，ATM（異步傳輸模式）、圖形、以太網(wǎng)或SCSI端口。這個基板支持PMC前面板輸入/輸出。還提供通過PMC載體板進(jìn)行額外擴展。SCSI接口MVME2700 VME模塊通過以下方式支持大容量存儲子系統(tǒng)：行業(yè)標(biāo)準(zhǔn)SCSI總線。這些子系統(tǒng)可能包括硬件和軟盤驅(qū)動器、流式磁帶驅(qū)動器和其他大容量存儲設(shè)備。SCSI接口使用Symbios 53C825A SCSI I/O實現(xiàn)控制器的時鐘速度為40 MHz。SCSI輸入/輸出控制器連接直接連接到PCI本地總線。MVME712M兼容版本的MVME2700路由SCSI通過P2連接器連接至MVME712M過渡模塊的線路。這個SCSI控制線路具有過濾網(wǎng)絡(luò)，以最小化VMEbus的影響P2處的信號噪聲。在MVME761兼容版本中，SCSI線路通過P2適配器板上的P2接頭至接頭J2。這個MVME761本身不支持SCSI，但是SCSI設(shè)備是通過使用包括的三排或五排適配器板來支持使用MVME761過渡板。SCSI總線在支持VME64擴展的系統(tǒng)中寬16位（配備5排160針VME背板連接器的）。這個SCSI總線在具有三行背板的VME系統(tǒng)中為8位寬。參考至MVME712M過渡模塊和P2適配器板安裝并使用手冊指定上使用的SCSI連接器的引腳分配過渡模塊。請參閱列出的Symbios 53C825A數(shù)據(jù)手冊附錄D中的相關(guān)文件，用于詳細(xì)編程信息
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.
