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Functional Description
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
The MVME2603/2604 routes its AUI and 10BaseT/100BaseTX lines through the P2 connector to the transition module (as illustrated in Figure
Every MVME2603/2604 is assigned an Ethernet station address. The address is $08003E2xxxxx, where xxxxx is the unique
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
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