American Megatrends 918 Manuale utente

www.ami.com

918 Backplane

Serial Attached SCSI / Serial ATA II

HIGHLIGHTS

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

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

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