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13. At the
14. Use the 177BugÕs ENV command to verify the NVRAM
System Considerations
The MVME177 draws power from both P1 and P2 of the VMEbus
backplane. P2 is also used for the upper 16 bits of data for 32-bit
transfers, and for the upper 8 address lines for extended addressing
mode. The MVME177 will not operate properly unless its main
board is connected to P1 and P2 of the VMEbus backplane.
Whether the MVME177 operates as a VMEbus master or as a
VMEbus slave, it is configured for 32 bits of address and for 32 bits
of data (A32/D32). However, it handles A16 or A24 devices in the
address ranges indicated in Chapter 3. D8 and/or D16 devices in the
system must be handled by the MC68060 software. Refer to the
memory maps in Chapter 3.
The MVME177 contains shared onboard DRAM whose base
address is software-selectable. Both the onboard processor and
offboard VMEbus devices see this local DRAM at base physical
address $00000000, as programmed by the MVME177Bug
Note that when the MVME177 comes up in a cold reset,
177Bug runs in System Mode. Using the Environment (ENV)
or MENU commands can make 177Bug run in Board Mode.
Refer to the Debugger Commands Table in Appendix B.
If the confidence test fails, the test aborts when the first fault
is encountered. If possible, an appropriate message displays,
and control then returns to the menu.
Refer to Appendix B for general information and operation of
the Debugger.
prompt, use the SET command to initialize
177-Bug>
the onboard Real-Time Clock (RTC) and to set the time and
date.
(BBRAM) parameters, and optionally use ENV to make
changes to the environmental parameters. Refer to Appendix
D for the environment parameters.
MVME177 Module Installation Instructions
2
2-15
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