Publication No. SBC330-0HH/3
Installation and Power-Up 17
The
SBC330RTM
has
two
options
for
serial
I/O:
a
single
mini
‐
DB9
connector
that
hosts
both
COM1
and
COM2
is
provided,
or
via
a
2x10
‐
way
header
suitable
for
use
with
GEIP’s
SIOX600
ribbon
to
DB9
serial
adapter.
COM1
is
configured
as
DTE
with
default
settings
of
9600
baud,
8
bits/character,
1
stop
bit,
parity
disabled
and
no
flow
control.
For
the
Ethernet
ports,
a
CAT5
(or
better)
straight
‐
through
patch
cable
for
10/100/
1000BaseTX.
TIP
The
VPX I/O Modules Manual, publication number VPXIOM-0HH
, contains more details on
fitting RTMs. Similar antistatic and safety precautions apply when handling and/or installing
I/O modules as for the SBC330.
3.5 Power Up Sequence
3.5.1 On-board sequencing
Several
components
on
the
SBC330
receive
multiple
power
supplies
and
require
PSU
power
‐
up
and
power
‐
down
sequencing.
The
actual
sequence
is
described
in
detail
in
later
sections
just
for
user
information
and
possible
debug
of
blue
power
LEDs.
The
SBC330
uses
a
Lattice
1014A
ispPAC
Power
Manager
device
to
sequence
the
on
‐
board
PSUs.
The
device
also
monitors
the
backplane
supply
voltages
and
only
turns
on
any
on
‐
board
supplies
once
the
backplane
voltage
on
VS3
is
above
4.49
Volts.
If
the
Board
Management
Microcontroller
(BMM)
asserts
the
BMM_OFF
signal,
the
power
manager
will
shut
down
all
on
‐
board
supplies
(except
VCC
and
P3V3_AUX).
The
power
manager
is
connected
to
the
on
‐
board
I
2
C
Bus
2,
allowing
software
read
‐
out
of
the
voltages
of
all
on
and
off
‐
board
supplies.
3.5.2 Inter-board sequencing
The
SBC330
supports
inter
‐
board
power
sequencing,
conforming
to
the
GEIP
internal
specification.
This
feature
allows
for
different
boards
in
a
system
to
see
the
power
‐
on
condition
at
delayed
times,
reducing
the
surge
loading/in
‐
rush
currents
on
the
system
backplane
PSU.
This
is
achieved
by
the
PSU_SEQ_OUT
and
PSU_SEQ_IN
signals,
which
can
be
daisy
‐
chained
between
boards.
The
SBC330
drives
the
PSU_SEQ_OUT
signal
low
(‘0’)
when
the
backplane
supplies
are
out
of
specification,
and
holds
it
low
until
all
of
the
on
‐
board
supplies
are
running
and
within
the
firmware
programmable
limits.
If
the
next
board
in
the
rack
does
not
power
until
it
sees
the
signal
go
high,
it
will
not
load
the
PSU
until
the
power
for
the
SBC330
has
stabilized.
The
SBC330
holds
off
all
on
‐
board
supplies
when
the
PSU_SEQ_IN
signal
is
held
low.
The
power
‐
on
sequence
is
initiated
if
the
PSU_SEQ_IN
signal
remains
low
500ms
after
the
off
‐
board
supplies
are
within
specification,
which
may
occur
if
the
previous
board
in
the
chain
fails.