Motorola MVME166IG/D2 - Manual (Page 51)

Installation and Startup
MVME166IG/D2 3-5
3
Note that when the MVME166 comes up in a cold reset, 166Bug runs in
System Mode. Using the Environment (ENV) or MENU commands can
make 166Bug run in Board mode. Refer to Appendix A.
2. Configure header J6 by installing/removing a jumper between pins 1 and
2. A jumper installed/removed enables/disables the system controller
function of the MVME166.
Bit J3 Pins Description
Bit #0 (GPI0) 1-2 When this bit is a one (high), it instructs the debugger
to use local Static RAM for its work page (i.e.,
variables, stack, vector tables, etc.).
Bit #1 (GPI1) 3-4 When this bit is a one (high), it instructs the debugger
to use the default setup/operation parameters in ROM
versus the user setup/operation parameters in
NVRAM. This is the same as depressing the RESET
and ABORT switches at the same time. This feature
can be used in the event the user setup is corrupted or
does not meet a sanity check. Refer to the
ENV
command (Appendix A) for the ROM defaults.
Bit #2 (GPI2) 5-6 Reserved for future use.
Bit #3 (GPI3) 7-8 When this bit is a one (jumper out) the BootBug will
continue execution after reset or power up. Normal
operation (jumper in) results in the BootBug executing
the
166Bug debugger in Flash memory.
Bit #4 (GPI4) 9-10 Open to your application.
Bit #5 (GPI5) 11-12 Open to your application.
Bit #6 (GPI6) 13-14 Open to your application.
Bit #7 (GPI7) 15-16 Open to your application.