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2
Hardware Description
30
Serial ATA (SATA)
The
PCH
includes
two
SATA
host
controllers
that
provide
six
SATA
3.0
ports.
These
ports
support
data
transfer
rates
of
3.0
Gb/s.
The
CPM
connects
two
SATA
ports
(0
and
1)
for
use
with
the
optional
1.8
inch
micro
SATA
SSD
drives
that
can
be
installed
in
an
optional
Radisys
DSSD
MXM
module.
Low Pin Count (LPC) Bridge
The
Low
Pin
Count
(LPC)
bridge
of
the
PCH
provides
read/write
cycles
for
memory,
I/O,
DMA,
and
Buss
Master
devices.
The
PCH
implements
the
LPC
Interface
Specification,
revision
1.1.
The
devices
contacted
over
this
LPC
bridge
include
the
IPMI
controller,
the
port
80
debug
header,
the
CPU
complex
FPGA,
and
the
TPM.
Serial Peripheral Interface (SPI)
The
PCH
provides
a
4
‐
pin
SPI
interface
for
connecting
to
and
controlling
the
BIOS
and
ME
Flash
devices
on
the
CPM.
There
are
two
64MB
Flash
devices
connected
to
the
SPI
bus
that
store
BIOS
boot
and
redundant
BIOS
boot
code.
Another
64MB
Flash
device
contains
redundant
ME
firmware
images.
On
CPM
power
‐
up,
the
primary
BIOS
Flash
device
is
selected
and
used.
If
a
corrupt
BIOS
is
detected
during
operation,
the
IPMC
forces
a
reboot
and
loads
the
redundant
BIOS
Flash
image.
The
SPI
bus
allows
the
PCH
to
read
and
also
program
the
primary
and
redundant
BIOS
boot
Flash
devices
as
well
as
the
ME
firmware
Flash
device.
Controlling
software
as
well
as
on
‐
board
jumpers
provide
Flash
device
write
protection.
Real-Time Clock (RTC)
The
PCH
implements
the
CPM
real
‐
time
clock
(RTC).
Rather
than
a
battery
backup,
the
CPM
uses
a
1F
“SuperCapacitor”
to
store
and
supply
the
minimum
2V
backup
RTC
power.
As
a
consequence,
RTC
power
is
available
for
at
least
two
hours
after
a
system
power
loss.
The
RTC
is
derived
from
a
32.768KHz
crystal
with
the
following
specifications:
•
Frequency
tolerance
@
25
°
C:
±
20
ppm
•
Frequency
stability:
maximum
of
‐
0.04
ppm/(
°
C)
2
•
Aging
F/f
(first
year
@
25
°
C):
±
3
ppm
•
±
20
ppm
from
0
‐
55
°
C
and
aging
1
ppm/year
The
RTC’s
capacitor
‐
backed
RAM
supports
two
8
‐
byte
ranges
that
can
be
locked
during
power
loss
(i.e.,
no
read/write)
when
the
locking
bits
are
set.
Once
a
range
is
locked,
the
range
can
be
unlocked
only
a
by
a
powergood
reset.