© 2008 American Megatrends Inc. - Specifications subject to change without notice
Data sheet
AMI’s MG9072 Enclosure Management controller provides exceptional flexibil-
ity: it can be utilized with both SATA or SAS backplanes for applications from entry-
level to mission-critical, while providing a cost effective solution that does not require
an extender. The chip implements the most widely used management protocols in
the field: SES-2 protocol over I2C and Serial GPIO for SAS and SATA HBAs, sup-
porting LED for up to eight drives, temperature sensor and fan management.
AMI works with a broad variety of HBA vendors to ensure compatibility.
Business-critical and telecom applica-
tions demand high-availability, which means
systems must be operational 99.999% of the
time. This implies that the system must be
monitored to identify potential failures be-
fore they happen and actively prevent them.
Proper environmental management is
needed in order to identify potential prob-
lems before they cause failures and help pin-
point their locations. Enclosure management
requires continuous monitoring of various
sensors that detect variations in voltages,
temperatures, humidity, fans and the like.
When enclosure monitoring tasks are
off-loaded to a lower-cost chip on the back-
plane, the server main processor is free of
ancillary tasks and its usage is focused on
mission-critical operations. In other words,
efficient enclosure management is key to op-
timum system performance.
The MG9072 chip manages hot-swap
SAS/SATA-II backplanes with enclosure
management, ideal for cost-sensitive and
performance-oriented system designs. The
device is designed to work with any SAS/
SATA HBA that supports SES-2 protocol
over I2C. Alternatively, each MG 9072 has
one SGPIO port that can communicate en-
closure management information to the SAS
host bus adapter, support LED management
and detect drive presence for up to 8 drives.
Serial Attached SCSI (SAS) and Se-
rial ATA are the latest storage interconnect
HigHligHts
Provides drive Activity, Fail, Hot-
spare and locate indication for
each drive slot
sgPiO or i2C interface to communi-
cate to sAs/sAtA HBA
support for sgPiO (sFF8485) or
sEs-2 protocol over i2C
support for two sFF-8448 Rev0.5
interface
supports up to 8 sAs/sAtA drives
supports one 2 wire temperature
sensor
Provides Buzzer Control output
supports Fan Fail & Fan Presence
input for up to 3 Fans
tested with numerous platforms
sgPiO Platforms:
- Adaptec
- lsi
- intel EsB2
- NViDiA
sEs Platforms:
- Adaptec
- AMCC
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04 30 2008
MegaRAC
®
MG9072
sAs/sAtA Enclosure Management Controller
standards, introducing higher speeds, more
robust data integrity, smaller designs and
wider standardization. The SAS interface
is compatible with lower-cost-per-gigabyte
SATA drives, giving system builders the
flexibility to integrate either SAS or SATA
devices while slashing the costs associated
with supporting two separate interfaces. As
the next generation of SCSI, SAS bridges
the parallel technology gap in performance,
scalability and affordability.
The physical layer of the SAS interface
is designed to be compatible with the physi-
cal layer of Serial ATA (SATA) interface.
This facilitates the SAS and SATA drives
to be plugged into a SAS backplane, which
reduces design and inventory costs for back-
plane manufacturers.
MG9072 can sync with the backplane to
support either SES-2 interface or SGPIO ac-
cording to SFF8485 rev. 0.6.
The sideband signals defined in SAS/
SATA standard can be used to carry SGPIO
or 2wire signals depending on Backplane ID
and Controller ID. The Controller ID is
used by the Backplane to select the interface.
The Backplane ID is used by the controller
to select the interface.
A ba+ckplane required to support only
8 drives can have just one MG7072. By add-
ing more devices, the backplane can manage
16, 32 drives or more.
