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Functional Description
3
Ethernet Interface
3-8
In the high availability systems, a Hot Swap Controller device is present
on the local PCI bus. This device can be used by the software to gain or
relinquish control of the Domains (CPCI buses). The HSC is also used to
oversee the HA functionality of the other I/O boards inserted into the non-
host system slots. At the debugger diagnostic level, the PPCBug
commands that can be used to control the HA features are described in
Chapter 5,
PPCBug. Refer to the Hot Swap Controller Driver
documentation of the specific operating system used for further
information about HSC functions and system calls invoked by the
operating system.
The MCP750HA module uses Digital Equipment's DECchip 21140 PCI
Fast Ethernet LAN controller to implement an Ethernet interface that
supports 10BaseT/100BaseTX connections. The balanced differential
transceiver lines are coupled via on-board transformers.
The MCP750HA routes its 10BaseT/100BaseTX lines to an RJ45
connector on the front panel.
Every MCP750HA 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 MCP750HA 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. Where xxxxx is a unique 5-nibble
number for the board.
Note
The Ethernet station address of boards manufactured after March
2000 is $0001AFxxxxxx
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