ICS TRIPLEX T9451工控系統模塊，T9451參數說(shuō)明
功能描述本節包含對MVME172LX。數據總線(xiàn)結構MVME172LX上的本地總線(xiàn)是32位同步總線(xiàn)，即基于MC68060總線(xiàn)，支持突發(fā)傳輸和窺探。各種本地總線(xiàn)主設備和從設備使用本地總線(xiàn)
溝通。本地總線(xiàn)由優(yōu)先級類(lèi)型仲裁；優(yōu)先權本地總線(xiàn)主節點(diǎn)從高到低依次為：82596CA LAN、53C710SCSI、VMEbus和MPU。
ICS TRIPLEX T9451工控系統模塊一般來(lái)說(shuō)，任何主機都可以訪(fǎng)問(wèn)然而，并非所有組合都通過(guò)了常識測試。提到MVME172 VME嵌入式控制器程序員參考指南和用戶(hù)指南，以確定每個(gè)設備的端口大小、數據總線(xiàn)連接，以及訪(fǎng)問(wèn)設備時(shí)適用的任何限制。微處理器MVME172LX可與MC68060或MC68LC060一起微處理器。MC68060具有片上指令和數據緩存以及浮點(diǎn)加工機（浮點(diǎn)協(xié)處理器是MC68060和MC68LC060。）有關(guān)詳細信息，請參閱M68060用戶(hù)手冊更多信息。MC68xx060緩存MVME172LX本地總線(xiàn)主機（VMEchip2，MC68060/MC68LC060、53C710 SCSI控制器和82596CA以太網(wǎng)控制器）可編程控制嗅探/緩存模式。這個(gè)支持MC68060/MC68LC060的MVME172LX本地總線(xiàn)從站總線(xiàn)偵聽(tīng)在中的“本地總線(xiàn)內存映射”中定義MVME172 VME嵌入式控制器程序員參考指南。Industry Pack DMA具有跳線(xiàn)來(lái)控制snoop的狀態(tài)。注意，MC68xx060的snoop功能與這些不同MC68xx040。軟件必須考慮這些差異考慮無(wú)VMEbus接口選項MVME172LX可以作為嵌入式控制器運行，無(wú)需VMEbus接口。為了支持此功能，在VMEchip2已在MC2chip中復制。此邏輯在中被禁用當VMEchip2存在時(shí)，MC2chip。啟用這些功能由軟件和MC2chip硬件初始化控制。
Functional Description
This section contains a functional description of the major blocks on the
MVME172LX.
Data Bus Structure
The local bus on the MVME172LX is a 32-bit synchronous bus that is
based on the MC68060 bus, and which supports burst transfers and
snooping. The various local bus master and slave devices use the local bus
to communicate. The local bus is arbitrated by priority type; the priority of
the local bus masters from highest to lowest is: 82596CA LAN, 53C710
SCSI, VMEbus, and MPU. As a general rule, any master can access any
slave; not all combinations pass the common sense test, however. Refer to
the MVME172 VME Embedded Controller Programmer’s Reference
Guide and to the user’s guide for each device to determine its port size, data
bus connection, and any restrictions that apply when accessing the device.
Microprocessor
The MVME172LX may be ordered with an MC68060 or MC68LC060
microprocessor.
The MC68060 has on-chip instruction and data caches and a floating point
processor. (The floating point coprocessor is the major difference between
the MC68060 and MC68LC060.) Refer to the M68060 user’s manual for
more information.
MC68xx060 Cache
The MVME172LX local bus masters (VMEchip2,
MC68060/MC68LC060, 53C710 SCSI controller, and 82596CA Ethernet
controller) have programmable control of the snoop/caching mode. The
MVME172LX local bus slaves which support MC68060/MC68LC060
bus snooping are defined in the “Local Bus Memory Map” in the
MVME172 VME Embedded Controller Programmer’s Reference Guide.
The Industry Pack DMA has jumpers to control the state of the snoop Note The snoop capabilities of the MC68xx060 differ from those
of the MC68xx040. Software must take these differences into
consideration.
No-VMEbus-Interface Option
The MVME172LX may be operated as an embedded controller without
the VMEbus interface. To support this feature, certain logic in the
VMEchip2 has been duplicated in the MC2chip. This logic is inhibited in
the MC2chip when the VMEchip2 is present. The enables for these
functions are controlled by software and MC2chip hardware initialization.
