Motorola MVME2600 用户手册
3-6
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Functional Description
3
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.
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
through the P2 connector to the transition module (as illustrated in
). The MVME712M front
panel has an industry-standard DB-15 connector for an AUI connection.
The MVME761 supports 10BaseT/100BaseTX connections.
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).
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.
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.
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.
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
10BaseT/100BaseTX connector, refer to the user’s manual for the
MVME712M or MVME761 (listed in
) respectively. Refer to the BBRAM/TOD Clock memory