Environmental Monitoring
control signal is
driven
back from the
I/
0 distribution
board
to the failed VME
Expansion
Module
to
turn
on
the over-temp LED. A VME Expansion Module
over-temp
bit
is set
in
the
status
register of the
I/0
distribution
board,
and
an
over-temp
interrupt
request
"IRQ" is
generated
to the CPU board.
Housekeeping Power Supply
There is a
+5
volt
housekeeping
voltage
supplied
from the base of the system
to the
CPU Module. This voltage is
required
to control the DC
power
control
circuitry
in
case
the
main
power
supply
is
turned
off
by
different sources. This
housekeeping
voltage is there
whenever
the AC
power
is available
in
the
system.
vee
+5
Volt Power Monitor
The VCC ( +5V)
power
from
all the SCSI Device Expansion
Modules
is
monitored
by
the
I/0
distribution board.
If
any
VCC voltage
drops
to 4.0 volts
or
lower, a system reset is
generated
from the
I/0
distribution
board
to the
VME
bus
and
a "SCSI VCC failed"
bit
is latched
in
the status C register.
The
VCC ( +5V)
power
from all
the
VME Expansion
Modules
is also
monitored
by
the
I/0
distribution board.
If
any
VCC voltage
drop
to 4.0 volts
or
lower, a
system
reset is asserted from the
l/0
distribution
board
to
the
VME bus. A
"VME Chassis VCC failed"
bit
is latched
in
the status C register.
S900RF/D4
2-11
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