Motorola MBX Series, Installation And Use Manual

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Ethernet Interface
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5
2.88MB Floppy Disk Drive Controller
The I/O controller incorporates a PS/2-compatible low- and high-density
disk drive controller for use with an optional 2.88MB external disk drive.
The drive interfaces with the I/O controller via MBX board connector J17,
which relays control signals. Refer to
Floppy Disk Connector J17 on page
6-28 for pin assignments.
Note
Supplying power for the disk drive is up to the system integrator.
Hard disk drives are under the control of the EIDE interface incorporated
into the Winbond PCI/ISA bridge. For a description of the EIDE interface,
refer to
PCI/ISA Bridge Controller on page 5-19 .
Keyboard and Mouse Interface
The Standard Microsystems 37C672 I/O controller chip used to implement
the on-board peripheral functions in standard configurations provides
ROM-based keyboard and mouse interface control. The keyboard and
mouse interface signals are filtered en route to utility connector #2.
Ethernet Interface
The MPC8xx processor chip incorporates an Ethernet interface that
communicates with external devices by way of the SCC1 port. The SCC1
port is coupled to an Ethernet transceiver that supports both AUI (optional)
and 10BaseT connections to the MBX board. The transceiver autodetects
AUI and 10BaseT connections, but you can also select AUI or 10BaseT by
setting control bits in control register #1.
Every MBX series embedded controller is assigned an Ethernet station
address. The address is $08003Exxxxxx, where xxxxxx is the unique six-
nibble number assigned to the board (i.e., every board has a different value
for xxxxxx).
Each MBX series embedded controller displays its Ethernet station
address on a label attached to the base board. In addition, the six bytes
including the Ethernet station address are stored in a serial EEPROM
device separate from the Ethernet transceiver. That is, the value
08003Exxxxxx is stored in EEPROM. The EPPCBug firmware used on