American Megatrends 918 User manual

www.ami.com
© 2005 American Megatrends Inc. - Specifications subject to change without notice
918 Backplane
Serial Attached SCSI / Serial ATA II
HIGHLIGHTS
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Four drive SAS/SATA-II backplane
Works with both SAS, Promise SATA host bus
adapters
Enclosure management protocol over I2C for
promise SATA HBA
SGPIO enclosure management for SAS
LEDs for activity, fail and rebuild for each
drive
Direct interface for system LEDs for global
activity and fail
Multiple backplanes can be cascaded
Support for "Locate" drive
Support for global activity, global fail and
global rebuild
Hot-swap drive support with individual power
control to each slot
JTAG and ICSP interface for development
Serial Attached SCSI (SAS) is the evolutionary replacement for parallel SCSI.
The physical layer of the SAS interface is designed to be compatible with the
physical layer of Serial ATA (SATA) interface. This facilitates the SAS & SATA
drives to be plugged into the SAS BackPlane provided the controller has support for
SATA. The SAS controller communicates with SATA devices using SATA Tunneled
Protocol (STP). AMI's 918 is a custom four drive SAS/SATA-II backplane with
support for SGPIO for SAS and enclosure management protocol for Promise SATA
host bus adapters.
The 918 Backplane is a hot-swap
SAS/SATA-II backplane with enclosure
management, ideal for cost-sensitive and
performance-oriented system designs. The
918 Backplane supports four drives and
supports LEDs for Activity, Fail and
Rebuild for each drive.
The 918 Backplane is designed to work
with both SAS host controller and Promise
SATA host controller supporting both
SGPIO and Vendor specific protocol for
Promise SATA HBA.
When the Backplane is connected to
SAS Host Bus Adapter (HBA), the
enclosure management is supported using
SGPIO interface. The Backplane supports
SGPIO as per SFF-8485 specification for
Serial GPIO (SGPIO) Bus Rev0.4. The
backplane has 4 slots and can connect up
to four SAS or SATA devices.
When the Backplane is connected to a
Promise SATA host bus adapter, the
protocol is supported through I2C. The
backplane can be connected to maximum
of four SATA devices in this configuration.
AMI designs custom backplanes for
major OEMs and chassis/case
manufacturers. When customer's integrate
AMI's backplanes into their case design,
they receive a quality product at a cost
effective price.
AMI designs custom SAS, SATA, SCSI
and IDE backplanes in a variety of
configurations, with key high-speed
system components. AMI's experienced
staff understands the latest industry
innovations and uses the latest tools and
techniques needed to design highly reliable
systems.
Data Sheet
02 04 2005

American Megatrends Inc. |w
ww.ami.com
6145-F Northbelt Parkway
Norcross GA 30071 | t: 770.246.8600
Sales & Product Information
[email protected] | t: 800.828.9264
Technical Support
suppo[email protected] | t: 770.246.8645
© 2005 American Megatrends Inc. - Specifications subject to change without notice
918 Backplane
Serial Attached SCSI / Serial ATA II
2/2
Features
Hardware Features
Works with both SAS and Promise SATA
controller.
4 drive SAS / SATAII Backplane
LEDs for Activity, Fail & Rebuild for each drive
Support for Global Activity, Global Fail &
Global Rebuild
Support for SGPIO and Enclosure
Management protocol for Promise SATA HBA
Hot swap drive support with individual power
control to each slot
I2C bus interface
JTAG and ISP interface for development
Host Interface
The backplane is connected to the host using
a single Serial internal Right Angle Multi
lane connector. The part used is Molex
87861-0010
The multilane connector carries up to four
high-speed serial channels and six sideband
signals (in the middle). The sideband signals
carry the SGPIO interface signals.
Drive Interface
Each backplane can support up to four SAS or
SATA II drives. The drive interface is SAS
Host Receptacle connector from Honda,
Part number HSAS-SP29SFPHG+. Each
backplane has four of these connectors. The
SAS drives are dual ported. Only one port is
used in each of the drive. The other port is
left unconnected.
Enclosure Management
SGPIO (when using SAS controller)
Promise protocol (when using Promise SATA
controller)
AMI Processor MG9070 is used to realize the
SGPIO and Promise protocol functions in
the Backplane.
Activity LED
Fail and Rebuild LED
Global Activity
Global Fail
Motherboard Activity
Drive Presence
Drive Power Logic
JTAG and ICSP