BENTLY 135489-01氣體監測器，135489-01使用配置手冊
系統注意事項MVME177同時(shí)從VMEbus的P1和P2供電背板。P2還用于32位的上16位數據傳輸，以及用于擴展尋址的上8個(gè)地址行模式MVME177將無(wú)法正常工作，除非其主要板連接到VMEbus背板的P1和P2。MVME177是作為VMEbus主機還是作為VMEbus從機，配置為32位地址和32位數據（A32/D32）。然而，它處理A16或A24設備第3章中指出的地址范圍。
BENTLY 135489-01氣體監測器中的D8和/或D16設備系統必須由MC68060軟件處理。請參閱第3章中的內存映射。MVME177包含共享板載DRAM，其基座地址可由軟件選擇。車(chē)載處理器和非車(chē)載VMEbus設備在基本物理位置查看此本地DRAM地址$00000000，由MVME177BUG固件編程。這可以通過(guò)軟件更改為任何其他基礎住址參考單板機程序員參考詳細信息指南。MVME177嘗試在不存在位置，并且不是系統控制器，如果系統沒(méi)有全局總線(xiàn)超時(shí)，MVME177永遠等待VMEbus循環(huán)完成。這會(huì )導致系統掛起。只有一種情況下，系統可能缺少此功能全局總線(xiàn)超時(shí)：? MVME177不是系統控制器，并且? 系統中其他地方?jīng)]有全局總線(xiàn)超時(shí)多個(gè)MVME177模塊可配置為單個(gè)VME卡片固定框架。通常，硬件多處理器功能包括支持。VMEbus上的其他MPU可以：? 打斷? 使殘廢與溝通，以及? 確定的操作狀態(tài)處理器。GCSR集的一個(gè)寄存器包括四位作為位置監視器，允許一個(gè)MVME177處理器向其他MVME177處理器廣播信號，如果任何所有八個(gè)寄存器都可以從任何本地處理器訪(fǎng)問(wèn)以及從VMEbus。MVME177為以太網(wǎng)LAN提供+12 Vdc電源收發(fā)器接口，通過(guò)位于MVME177模塊。+12 Vdc時(shí)，+12 V LED亮起可獲得的多功能開(kāi)關(guān)位于二極管CR1附近。多路開(kāi)關(guān)就像斷路器一樣，當電流過(guò)大時(shí)，斷路器會(huì )自動(dòng)復位移除負載。如果以太網(wǎng)收發(fā)器無(wú)法工作，請檢查
System Considerations
The MVME177 draws power from both P1 and P2 of the VMEbus
backplane. P2 is also used for the upper 16 bits of data for 32-bit
transfers, and for the upper 8 address lines for extended addressing
mode. The MVME177 will not operate properly unless its main
board is connected to P1 and P2 of the VMEbus backplane.
Whether the MVME177 operates as a VMEbus master or as a
VMEbus slave, it is configured for 32 bits of address and for 32 bits
of data (A32/D32). However, it handles A16 or A24 devices in the
address ranges indicated in Chapter 3. D8 and/or D16 devices in the
system must be handled by the MC68060 software. Refer to the
memory maps in Chapter 3.
The MVME177 contains shared onboard DRAM whose base
address is software-selectable. Both the onboard processor and
offboard VMEbus devices see this local DRAM at base physical
address $00000000, as programmed by the MVME177Bugfirmware. This may be changed, by software, to any other base
address. Refer to the Single Board Computers Programmer's Reference
Guide for details.
If the MVME177 attempts to access offboard resources in a
nonexistent location, and is not system controller, and if the system
does not have a global bus time-out, the MVME177 waits forever for
the VMEbus cycle to complete. This causes the system to hang up.
There is only one situation in which the system might lack this
global bus time-out:
? The MVME177 is not the system controller, and
? There is no global bus time-out elsewhere in the system
Multiple MVME177 modules may be configured into a single VME
card cage. In general, hardware multiprocessor features are
supported.
Other MPUs on the VMEbus can:
? Interrupt
? Disable
? Communicate with, and
? Determine the operational status of
the processor(s). One register of the GCSR set includes four bits
which function as location monitors to allow one MVME177
processor to broadcast a signal to other MVME177 processors, if
any. All eight registers are accessible from any local processor as
well as from the VMEbus.
The MVME177 provides +12 Vdc power to the Ethernet LAN
transceiver interface through a 1 amp polyswitch F2 located on the
MVME177 module. The +12V LED lights when +12 Vdc is
available. The polyswitch is located near diode CR1. Polyswitches
act like circuit breakers that reset automatically when the excessive
load is removed. If the Ethernet transceiver fails to operate, check
