Motorola MVME166IG/D2 - Manual (Page 30)

Board Level Hardware Description
1-16 MVME166 Single Board Computer Installation Guide
1
Every MVME166 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 MVME166 has a different value for XXXXX).
Each module has an Ethernet Station Address displayed on a label attached to
the VMEbus P2 connector. In addition, the six bytes including the Ethernet
address are stored in the configuration area of the BBRAM. That is,
08003E2XXXXX is stored in the BBRAM. 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 MVME166 debugger has the
capability to retrieve or set the Ethernet address. So does the MVME166
BootBug.
If the data in the BBRAM is lost, the user should use the number on the
VMEbus P2 connector label to restore it.
The Ethernet transceiver interface is located on the MVME166 main module,
and the industry standard connector is located on the MVME712X transition
module.
Support functions for the 82596CA are provided by the PCCchip2. Refer to the
82596CA user’s guide for detailed programming information.
SCSI Interface
The MVME166 provides for mass storage subsystems through the industry-
standard SCSI bus. These subsystems may include hard and floppy disk
drives, streaming tape drives, and other mass storage devices. The SCSI
interface is implemented using the NCR 53C710 SCSI I/O controller.
Support functions for the 53C710 are provided by the PCCchip2. Refer to the
53C710 user’s guide for detailed programming information.
SCSI Termination
The individual configuring the system must ensure that the SCSI bus is
properly terminated at both ends. On the MVME166, the SCSI bus termination
is provided on the main board. The terminators are enabled/disabled by a
jumper. If the SCSI bus ends at the MVME166, the SCSI terminators must be
enabled by installing the jumper. Refer to the jumper configuration tables in
Chapter 2.
Local Resources
The MVME166 includes many resources for the local processor. These include
tick timers, software programmable hardware interrupts, watchdog timer,
and local bus timeout.