American Megatrends MegaRAC MG9077 User manual

© 2007-2008 American Megatrends Inc. - Specications subject to change
Data Sheet
AMI’s MG9077 backplane controller for SATA or SAS backplanes provides
a cost eective solution for applications from entry-level to mission-critical.
Exceptionally exible, the chip can be utilized in a variety of congurations.
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 conguration 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-congurable for 16 congurations
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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 Specication 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
congurations 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

2/2
Features
American Megatrends Inc.
5555 Oakbrook Parkway - Suite 200
Norcross, GA 30093 | t: 770.246.8600
Sales & Product Information
[email protected] | t: 800.828.9264
Technical Support
[email protected] | t: 770.246.8645
www.ami.com
© 2008 American Megatrends Inc. - Product Specications Subject to Change Without Notice - All Rights Reserved
All Trademarks are property of their respective owners
MegaRAC® MG9077
Space-Saving SAS/SATA Enclosure Management Controller
Key Features
SAS/SATA Drive Support
One dedicated SMBus (I2C) connection
Small TQFP-48 Package (9mm X 9mm)
Internal Temperature Sensor
Congurable from 1 to 8 drives - 4 chips can
be cascaded on same SGPIO to support 32
drives, for a total of 64 managed LEDs
Can drive 18 LEDs directly in 6 drive designs
Supports SGPIO Specication SFF-8485
Wide Voltage Supply Input range (2.5V
-5.25V)
Internal Oscillator (no external crystal
needed)
Internal RTC
Drive Activity, Locate and Fail LED for each
drive
Ready LED Support
PIN congurable for 16 LED congurations
Supported Enclosure Management Proto-
cols
SFF-8485 Specication for Serial GPIO (SGPIO)
Bus Revision 0.7
SGPIO
Two SGPIO ports communicate enclosure
management information, LED management
and drive presence
SMBus
Read-only slave device
Can be read/written as typical sensor device
Sensor data access through registers
SMBus Bitmask registers
SMBus alerts
SMBus alert event log
SMBus Data Line
SMBus Clock Line
Programmable SMBUS Timeout
2 MG9077 can be supported on the same
SMBus distinguished by their address
LED Latch Enables
Latch enable for Activity LED
Lach enable for Fail LED
Latch enable for Locate LED
Reference Designs
Contact AMI to receive a reference design in
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Adobe Acrobat or OrCad schematic format.
Please provide your schematic for verication
before nalizing your layout.
Development Tools
Hardware Tools
Series 950 USB upgrade tool with 4-pin head-
er to upgrade any part in-circuit
Comes with Windows based upgrade
Software Tools
DOS-based upgrade application (FlashMG)
that boots from a ash drive and upgrades
rmware through the system BMC
Windows-based upgrade application (Win-
FlashMG) that upgrades rmware through
the BMC
Linux source with binary to upgrade the rm-
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SMall footprint for exceptional ScalaBility
The diagram above shows sets of congurations with multiple backplanes cascaded on
the same SGPIO-bus. These congurations also support multi-initiator congurations,
which allow two initiators to access the same set of drives through both SAS-ports.
With MeGarac MG9077 there’Snoneed on the Backplane for....
cryStal flaSh teMp SenSor eeproM
AMI
MG9077
Activity LEDs
Status LEDs
Mated
Adr: 0xc 0
Conf:0x00
AMI
MG9077
Ac ti vity LED s
Status LEDs
Mated
Adr: 0xc0
Conf:0x01
AMI
MG9077
Ac tivity LEDs
Status LEDs
M ated
Adr: 0xc0
Conf:0x02
8 88
SGPIO BUS-0
0 1
SGPIO
-1
0 1
SGPIO
0 1
SGPIO
Port 0
Port 1
8 88
Por t 0
Por t 1 Por t 0
Por t 1
SAS
Expander
DOWN-STREAM
SAS/SATA
SGPIO
SAS
Expander
DOWN-STREAM
SAS/SATA
SGPIO
SGPIO BUS
TO HBA
TO HBA