Motorola MVME162P-242, Installation And Use Manual

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2-6 Computer Group Literature Center Web Site
Startup and Operation
2
4. Header J12 enables/disables the SCSI terminators provided on the
MVME162P2. If the board is to be located at either end of an SCSI
bus, the SCSI bus terminators must be enabled. The factory
configuration has a jumper installed on J12, enabling SCSI
termination. Verify that this setting is appropriate for your
application.
5. Header J13 configures the IP bus clock for either 8MHz or the
processor bus clock speed (25MHz for the MC68040 and
MC68LC040). The factory configuration has a jumper installed on
J13 pins 1-2, denoting an 8MHz clock. Verify that this setting is
appropriate for your application.
6. The jumpers on header J14 establish the SRAM backup power
source on the MVME162P2. The factory configuration uses
5V standby voltage as the primary and secondary power
Table 2-2. Software-Readable Switches
Bit No. S4 Segment Function
GPI0 8 When set to 1 (high), instructs the debugger to use local static RAM for
its work page (variables, stack, vector tables, etc.).
GPI1 7 When set to 1 (high), instructs the debugger to use the default
setup/operation parameters in ROM instead of the user setup/operation
parameters in NVRAM. The effect is the same as pressing the
RESET
and
ABORT
switches simultaneously.
This feature can be helpful in the event the user setup is corrupted or
does not meet a sanity check. Refer to the ENV command description
for the Flash/ROM defaults.
GPI2 6 Reserved for future use.
GPI3 5 When set to 0 (low), informs the debugger that it is executing out of
Flash memory. When set to 1 (high), it informs the debugger that it is
executing out of the PROM.
GPI4 4 Open to your application.
GPI5 3 Open to your application.
GPI6 2 Open to your application.
GPI7 1 Open to your application.