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2.6.2 B o a r d ID Check
Each breadboard may have one or more board
ID
bytes selected by the user. The user selects
a port, a value and a mask if necessary. This information is stored into non-vol by the user
and verified during the power-up sequence. This check is bypassed if not specified by the
user.
2.6.3 P o r t Initialization
A111/0 ports configured as outputs are initialized to either all 0's or all l's during system reset
(jumper selectable on each breadboard). The user can also specify initial values for ports and
have them stored in Non-vol. I f any of these values have been specified, they are set at this
point in the power-up sequence. The operation of the board ID is described in more detail in
Section 3.2.1
2.6.4 V X l b u s Interface Initialization
At times, it may be desirable for the user to specify an initial value for one or more of the
VXlbus registers. For example, the user specifies a model code. This requires the new model
code to be placed in the "device-type" VXlbus register. The user can
specify
these values and
have them stored in Non-Vol. I f any of these values have been specified, they are set up at
this point in the power-up sequence.
2.6.5 Debugger Initialization
If the debugger
ROM
is present, it requires initialization to be performed at this point.
2.6.6 I n v o k e User Routine
The
user may want to gain control after the 7064 has been initialized, but before
the main
loop
starts running. The user can specify a vector for this power-up routine. This vector is
stored in non-vol. I f the vector has been specified, the user's initialization routine is called at
this point.
NOTE
At this point, invoke the main routine if the main processing loop is not
desired.
2-5
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