CPU
MODULE~
This chapter describes the CPU
Module
and
its components. The CPU
Module
contains the single
board
computer, internal
modem,
and
I/0
distribution
board.
There is only
one
CPU
Module
in
a
stack
Up
to three expansion
modules
may
be
stacked
under
the CPU Module. The CPU Module
has
three VME
board
positions.
CPU
Configuration
The CPU
Module
contains the single
board
computer, the
I/0
distribution
board,
and
the internal
modem.
There are four positions
in
this module. The
top
slot is designated as the first slot because the VME
bus
expands
from the
top
down.
Due
to special
routing
of signals
in
the backplane
and
VME
terminator
board
the first slot is the last logical slot.
The first slot
in
the
CPU
Module
has
a partial
Pl
only VME bus. The
Pl
only
interface to the VME
bus
is
used
by
the
I/0
distribution
board
for
communication to the system.
1/0
Distribution
Board
The
I/
0 distribution
board
contains all the
input
and
output
connections from
the single
board
computer.
It
is a single
wide
VME form factor
board.
The
I/0
distribution
board
has
four
primary
functions:
0 System
power
control
These circuits,
powered
by
the base system
power
supply,
turn
the
modules'
power
supplies
on
and
off. The circuits are connected to the
key lock switch located
on
the front of the CPU Module.
0
Power
monitor
This circuit detects
when
any
module
power
supply
is
out
of regulation.
0
Modem
and
cooling reset
S900RF/D4
When
the keylock switch is
turned
to the reset position,
the
internal
modem
and
the cooling failure
power
shutdown
circuitry is reset.
2-1
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