GJR2911200R1轉(zhuǎn)速計卡件，ABB產(chǎn)品外觀
SCSI終止配置系統(tǒng)的個人必須確保SCSI總線兩端正確終止。
在MVME712M輸入/輸出模式下，MVME2603/2604基板使用為使用的P2適配器板上的SCSI總線終端提供的插座使用MVME712M。如果SCSI總線終止于適配器板，終端電阻器必須安裝在那里+SCSI的5V直流電源總線終端PWR信號和終端電阻器通過保險絲供電位于適配器板上。
GJR2911200R1轉(zhuǎn)速計卡件在MVME761輸入/輸出模式下，與MVME761一起使用的P2適配器板具有用于啟用/禁用SCSI總線終端的跳線+5V直流電源SCSI終端通過適配器上的多開關(guān)提供板以太網(wǎng)接口
MVME2603/2604 VME模塊使用數(shù)字設(shè)備的DEC芯片21140 PCI快速以太網(wǎng)LAN控制器，用于實現(xiàn)以太網(wǎng)支持AUI（通過MVME712M）和10BaseT/100BaseTX（通過MVME761）連接。平衡的差分收發(fā)器線路通過車載變壓器耦合。
MVME2603/2604路由其AUI和10BaseT/100BaseTX線路通過P2連接器連接到過渡模塊（如圖所示第1-47頁圖1-21和第1-49頁圖1-22）。MVME712M前部面板具有用于AUI連接的行業(yè)標(biāo)準(zhǔn)DB-15連接器。MVME761支持10BaseT/100BaseTX連接。每個MVME2603/2604分配一個以太網(wǎng)站地址。這個地址是$08003E2xxxxx，其中xxxxx是唯一的5位數(shù)字分配給電路板（即每個電路板的xxxxx值不同）。每個MVME2603/2604在標(biāo)簽上顯示其以太網(wǎng)站地址連接到PMC連接器禁止區(qū)域的基板上前面板。此外，包括以太網(wǎng)站的六個字節(jié)地址存儲在片外以太網(wǎng)控制器的SROM中即，值08003E2xxxxx存儲在SROM中。在1F2C美元的補(bǔ)償下可以讀取前四個字節(jié)（08003E2x）。在1F30美元的補(bǔ)償下，較低的可以讀取兩個字節(jié)（xxxx）。MVME2603/2604調(diào)試器，能夠通過CNFG命令。
注：唯一以太網(wǎng)地址在工廠設(shè)置，不應(yīng)被改變。任何更改此地址的嘗試都可能創(chuàng)建節(jié)點或總線爭用，從而使電路板無法運(yùn)行。如果SROM中的數(shù)據(jù)丟失，請使用PMC中標(biāo)簽上的數(shù)字連接器禁止區(qū)域恢復(fù)。對于過渡模塊AUI或10BaseT/100BaseTX連接器，有關(guān)詳細(xì)信息，請參閱用戶手冊MVME712M或MVME761（在附錄D中列出，相關(guān)文件）。參考BBRAM/TOD時鐘存儲器
SCSI Termination
The individual configuring the system must ensure that the SCSI bus is
properly terminated at both ends.
In MVME712M I/O mode, the MVME2603/2604 base board uses the
sockets provided for SCSI bus terminators on the P2 adapter board used
with the MVME712M. If the SCSI bus ends at the adapter board,
termination resistors must be installed there. +5V DC power to the SCSI
bus TERMPWR signal and termination resistors is supplied through a fuse
located on the adapter board.
In MVME761 I/O mode, the P2 adapter board used with the MVME761
has a jumper to enable/disable SCSI bus terminators. +5V DC power for
SCSI termination is supplied through a polyswitch located on the adapter
board.Ethernet Interface
The MVME2603/2604 VME module uses Digital Equipment’s DECchip
21140 PCI Fast Ethernet LAN controller to implement an Ethernet
interface that supports both AUI (via MVME712M) and
10BaseT/100BaseTX (via MVME761) connections. The balanced
differential transceiver lines are coupled via on-board transformers.
The MVME2603/2604 routes its AUI and 10BaseT/100BaseTX lines
through the P2 connector to the transition module (as illustrated in Figure
1-21 on page 1-47 and Figure 1-22 on page 1-49). The MVME712M front
panel has an industry-standard DB-15 connector for an AUI connection.
The MVME761 supports 10BaseT/100BaseTX connections.
Every MVME2603/2604 is assigned an Ethernet station address. The
address is $08003E2xxxxx, where xxxxx is the unique 5-nibble number
assigned to the board (that is, every board has a different value for xxxxx).
Each MVME2603/2604 displays its Ethernet station address on a label
attached to the base board in the PMC connector keepout area just behind
the front panel. In addition, the six bytes including the Ethernet station
address are stored in an SROM off the DECchip Ethernet controller, that
is, the value 08003E2xxxxx is stored in SROM. At an offset of $1F2C, the
upper four bytes (08003E2x) can be read. At an offset of $1F30, the lower
two bytes (xxxx) can be read. The MVME2603/2604 debugger, PPCBug,
has the capability to retrieve or set the Ethernet station address via the
CNFG command.
Note The unique Ethernet address is set at the factory and should not
be changed. Any attempt to change this address may create node
or bus contention and thereby render the board inoperable.
If the data in SROM is lost, use the number on the label in the PMC
connector keepout area to restore it.
For the pin assignments of the transition module AUI or
10BaseT/100BaseTX connector, refer to the user’s manual for the
MVME712M or MVME761 (listed in Appendix D, Related
Documentation) respectively. Refer to the BBRAM/TOD Clock memory
