Ethernet Interface - Motorola MVME1603 Installation And Use Manual

Functional Description
The MVME1600-011 base board uses the sockets provided for SCSI bus
terminators on the P2 adapter board. If the SCSI bus ends at the adapter
board, then termination resistors must be installed on the adapter board.
+5Vdc power to the SCSI bus signal and termination resistors
TERMPWR
3
is supplied through a fuse located on the adapter board.

Ethernet Interface

The MVME1603/MVME1604 uses Digital Equipment's DECchip 21040
LAN controller to implement an Ethernet interface that supports both AUI
and 10BaseT connections. The balanced differential transceiver lines for
AUI and 10BaseT are coupled via on-board transformers.
The MVME1600-001 base board routes its AUI and 10BaseT lines
through the P2 connector to the MVME760 transition module (as
illustrated in Figure 1-12 on page 1-41). The MVME760 front panel has an
industry-standard DB15 connector and 8-pin RJ45 connector for the AUI
and 10BaseT connections respectively (see Figure 1-4 on page 1-17).
The MVME1600-011 base board uses an 8-pin RJ45 on its front panel for
10BaseT lines (see Figure 1-5 on page 1-19) and routes its AUI lines
through the P2 connector to the MVME712M transition module (as
illustrated in Figure 1-13 on page 1-44). The MVME712M front panel has
an industry-standard DB15 connector for the AUI connections (see Figure
1-6 on page 1-28).
Every MVME1603/MVME1604 is assigned an Ethernet station address.
The address is $08003E2xxxxx, where xxxxx is the unique 5-nibble number
assigned to the board (i.e., every board has a different value for xxxxx).
Each MVME1603/MVME1604 displays its Ethernet station address on a
label attached to backplane connector P2. In addition, the six bytes
including the Ethernet station address are stored in the NVRAM
(BBRAM) configuration area specified by boot ROM. That is,
08003E2xxxxx is stored in NVRAM. At an address of $FFFC1F2C, the
upper four bytes (08003E2x) can be read. At an address of $FFFC1F30,
the lower two bytes (xxxx) can be read. The MVME1603/MVME1604
debugger, PPCBug, has the capability to retrieve or set the Ethernet station
address.
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