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Board Level Hardware Description
1
Software Initialization
Multi-MPU Programming Considerations
Local Reset Operation
1-50
Most functions that have been done with switches or jumpers on other
modules are done by setting control registers on the MVME162LX
Embedded Controller. At power-up or reset, the PROMs that contain the
162Bug debugging package set up the default values of many of these
registers.
Specific programming details may be determined by study of the M68040
Microprocessor User's Manual. Then check the details of all the
controller's onboard registers as given in the MVME162LX Embedded
Controller Programmer's Reference Guide.
Good programming practice dictates that only one MPU at a time have
control of the MVME162LX control registers. Of particular note are:
Registers that modify the address map
Registers that require two cycles to access
VMEbus interrupt request registers
Local reset (LRST) is a subset of system reset (SRST). Local reset can be
generated five ways:
Expiration of the watchdog timer
Pressing the front panel
function is disabled)
By asserting a bit in the board control register in the GCSR
By SYSRESET*
By powerup reset.
switch (if the system controller
RESET
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