© 2007-2008 American Megatrends Inc. - Specications subject to change
Data Sheet
AMI’s MG9077 backplane controller for SATA or SAS backplanes provides
a cost eective solution for applications from entry-level to mission-critical.
Exceptionally exible, the chip can be utilized in a variety of congurations.
MG9077 implements the most advanced technologies in the eld: enclosure
management protocol SGPIO (Serial GPIO) for SAS and SATA HBAs and SMBus for
access to BMC or Service Processor. The chip supports LEDs (Activity, Fail/Rebuild
and Locate) for up to eight drives and is equipped with an internal temperature
sensor. Multiple chips can be cascaded to support up to 32 drives.
AMI’s experience in the storage and
server market converged in designing
an exceptionally exible controller for
enclosure management. MG9077 is
compatible with SAS/SATA Host Bus
Adapters from all major storage vendors
and supports two Serial GPIO ports for
connection to the HBA.
The MG9077 backplane controller
can directly drive two LEDs for up to 8
slots or three LEDs for up to 6 slots. The
chip determines the number of drives
either by conguration or by sensing
the connections on the Mx-bus.
Multiple chips can be cascaded
to manage a higher number of drives.
Typical designs will include two or three
chips for managing 16 or 24 drives; it
is possible to cascade 4 MG9077 to
manage 32 drives.
The Serial Attached SCSI (SAS)
protocolistheevolutionaryreplacement
for parallel SCSI, the ubiquitous I/O
HIGHLIGHTS
Manages Drive Activity, Fail/Rebuild and
Locate LEDs for SAS/SATA drives
Supply range (2.7V -3.6V).
Very small footprint: TQFP-48 package
(9mm x 9mm)
Supports 8 drives - Up to 4 chips can be
cascaded to support 32 drives
Drives up to 16 LEDs (2x8) or up to 24 LEDs
through latches
Drives up to 18 LEDs (3x6) directly for 6
drive servers
Drive Ready LED Support
Asynchronous handling of 2 SGPIO
SFF8485 interfaces
SMBus support for access to BMC or
service processor
Internal oscillator saves board space - No
clock or crystal needed
Compatible with any existing SGPIO-HBA
vendor.
One internal temperature sensor
No need to program CPLDs or develop
microcontroller solutions
Cost competitive - Easy implementation
with reference designs and development
tools
Lead free, RoHS compliant, Green
packaging
Supported initiators
- LSI HBA and LSI SAS-Expanders
- Intel ESB-2
- ICH9
- Adaptec (SGPIO only)
- AMCC (SGPIO only)
- Broadcom
- NVIDIA
- HighPoint
Pin-congurable for 16 congurations
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
09 17 2008
MG9077
communication protocol for servers and
workstations. The SAS interface physical
layer is designed to be compatible with
the physical layer of the Serial ATA (SATA)
interface. This facilitates either SAS or
SATA drives to be plugged into a SAS
backplane, provided the controller has
SATA support.
Thecontrollerincludesonetemperature
sensor. Each device has two SGPIO ports
that communicate enclosure management
information to the SAS host bus adapter
and can support LED management and
detect drive presence. MG9077 supports
the SFF 8485 Specication for Serial GPIO
Bus Rev. 0.7.
MegaRAC MG9077 supports Drive
Ready LED signals from the drive, a useful
feature to incorporate drive activity in
congurations without SGPIO.
MegaRAC MG9077 is designed to
save board space: comes in a small TQFP
package measuring just 9x9 mm, and
MG9077
9 mm
9 mm
SGPIO0
MG9077
Config
CPU
FLASH
SRAM
OSC
SGPIO1
16 or 18 LEDs
8 Mated/Ready LED
SMBus
MG9077 Block diaGraM
