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Intel SR6850HW4 7.2Functional Architecture, 7.2.1 SCSI Buses, 7.2.2 SCSI Drive Power Control, Note:, 7.2.2.2Initial Power-onCharge Pumping

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Intel® Server Platform SR6850HW4 TPS

SCSI Backplane Board

7.2Functional Architecture

This section provides an architectural description of the Server Platform SR6850HW4 SCSI Backplane Board functional blocks.

7.2.1 SCSI Buses

The SCSI Backplane Board passes the SCSI bus from the Server Board Set SE8500HW4 Mainboard to the internal hot-swap SCSI hard disk drives. Each bus is Ultra320 SCSI low- voltage differential (LVD) capable. Single-ended (SE) drives are not supported in the hot-swap disk drive bay. Do not install an internal SE drive because the behavior of the drives is unpredictable and data corruption could result. This bus is comprised of 68 signals, operating at an 80MHz clock rate. The SCSI bus is capable of a 320MB data rate, from double transition (DT) data transfers on a two-byte wide bus. The bus attaches to the Server Board Set SE8500HW4 Mainboard with a standard 68-pin SCSI connector.

320 MB/s = 2 byte bus * 80 MHz clock * double transitions.

Note: Drives and the SCSI controller on the Server Board Set SE8500HW4 Mainboard negotiate the actual SCSI bus data rate.

7.2.2 SCSI Drive Power Control

SCSI power control is provided under control of the Programmable Logic Device (PLD). SCSI power control includes drive power switching, initial power-on charge pumping, over-current protection, system status notification, and drive status LEDs.

The system is notified when a hot-swap SCSI hard disk drive is detected. The SCSI Backplane Board applies power to the designated hot-swap SCSI hard disk drive and illuminates the status LED to provide visual indication of the event.

7.2.2.1Internal SCSI Drive Power Switching

Each SCSI drive is supplied with +12V and +5V. Separate MOSFET switches are used to apply and remove +12V and +5V to each hot-swap SCSI hard disk drive.

7.2.2.2Initial Power-on Charge Pumping

An initial current surge (up to 20A) is applied when power is first applied to a hot-swap SCSI hard disk drive. To reduce this initial current surge the SCSI Backplane Board charge pumps the drives for ~700µs. Charge pumping the hard disk drives keeps the average power-on current to approximately 3A.

Revision 1.0	73
	Intel order number D23151-001

Contents

Revision May Enterprise Platforms and Services Division – Marketing Revision History Disclaimers Table of Contents Table of Contents Intel® Server Platform SR6850HW4 TPS Page Page Glossary List of Figures Page List of Tables List of Tables Page < This page intentionally left blank 1.Product Overview Page 2.System Overview 2.1System Feature Overview 2.2Introduction Page Page Figure 4. Server Platform SR6850HW4 Chassis Block Diagram 2.3External Chassis Features - Front 2.3.1Front Control Panel 2.3.2Hot-swapHard Disk Drive and Peripheral Device Bays 2.4External Chassis Features - Rear 2.5Internal Chassis Features 2.5.1Server Board Set SE8500HW4 Mainboard 2.5.2Server Board Set SE8500HW4 Memory Board 2.5.3Power Distribution Board 2.5.4SCSI Backplane Board Board 2.5.5Front Panel I/O Board 2.5.6Front Panel Control Board 2.5.7SATA-to-IDEConverter Board 2.5.8Intel® Management Module 2.5.9Fibre Channel Module 2.5.10RAID On Motherboard (ROMB) 2.5.11Power Supply Module 2.5.11.1System Power Budget Notes: 2.5.12Cooling Subsystem 2.6New Platform Features 2.6.1Advanced Memory Performance and Protection 2.6.2Rolling BIOS 2.7Server Management 2.7.1Intel Management Module (IMM) Page 2.7.2Hot Swap Controller 2.8Reliability, Availability, Serviceability, Usability, Manageability (RASUM) 2.9Expansion Support 2.10 Specifications 2.10.1Environmental Specifications Summary 2.10.2Physical Specifications 3.Server System Chassis and Assemblies 3.1Chassis, Rails and Top Cover 3.1.1 Chassis Page 3.1.2 Slide Rails 3.1.3 Top Cover 3.2Power and Fans 3.3Fan Subsystem 3.4Mainboard Assembly 3.5Peripheral Bay and Front Panel 3.5.1 Hot-SwapHard Disk Drive Carrier 3.5.2Optical Drive Carrier 3.5.3Front Panel 3.6Front Bezel 4.Cables and Connectors Figure 16. Server Platform SR6850HW4 Interconnect Diagram 4.1Cable and System Interconnect Descriptions Page 4.2User-accessibleI/O Connectors 4.2.1Video Connectors 4.2.2USB 2.0 Connectors 4.2.3Etherent Connectors Page 4.2.4External 68-pinUltra320 SCSI VHDCI Connector 4.2.5 Internal 68-pinSCSI Connectors 4.2.6 80-pinSCA2 Hard Disk Drive Connectors 4.2.7AC Power Input Connectors 4.2.83-pinChassis Intrusion Connector 4.2.912-pinPower Distribution Board Power Connector 4.2.1030-pinPower Distribution Board to Mainboard Connector 4.2.1130-pinSCSI Backplane Board Board to Front Panel I/O Board Connector 4.2.12100-pinMainboard to SCSI Backplane Board Board Connector 4.2.13Peripheral Power Connector 4.2.14Fan Connectors 4.2.1550-pinFront Panel Control Module Connector 4.2.16SATA-to-IDEConverter Board Connector 4.2.17SATA-to-IDEConverter Board Power Connector 4.2.18 SATA Connector Page 5.Power Supply 5.1Mechanical Outline Page 5.2Power Supply Output Interface 5.2.1Blade Connector 5.3AC Input Requirement 5.3.1AC Input Voltage Specification 5.3.2Efficiency 5.3.3Input Over-CurrentProtection 5.3.4Inrush Current 5.4DC Output Requirements 5.4.1Hot Swap Functionality 5.4.2Output Current Rating 5.4.3Over- and Under-VoltageProtection 5.4.4Over-currentProtection 5.4.5Short Circuit Protection 5.4.6Reset After Shutdown 5.4.7Current Sharing 5.4.8I2C Devices 5.4.8.2I/O Port Expander Table 36. I/O Port Expander Signals Table 37. I/O Port Expander Codes 5.4.8.3Temperature Sensors 5.4.9 Fan Speed Control 5.4.10Power Supply Module LED indicators Page 6.Power Distribution Board 6.1Introduction Page 6.2Signal Descriptions and Pinouts 6.2.1Remote On/Off (-PS_ON) 6.2.2Power Good Signal (POK or P_GOOD) 6.2.3VIN_GOOD 7.SCSI Backplane Board 7.1Introduction 7.1.1Block Diagram 7.1.2 Architectural Overview Page 7.1.3Mechanical Specifcations 7.1.4 Component Location Figure 30. SCSI Backplane Board Board Component Placement (Secondary Side) 7.2Functional Architecture 7.2.1 SCSI Buses 7.2.2 SCSI Drive Power Control 7.2.2.3Over-currentProtection (OCP) 7.2.2.4Power Control Interlock 7.2.2.5System Status Notification 7.2.2.6SCSI Status LEDs 7.2.3SCSI Enclosure Management 7.2.4 Server Management Interface 7.2.5Resets 7.2.6 Connector Interlocks 7.2.7 Clock Generation 7.2.8Programmed Devices 7.3Signal Descriptions 7.3.1Power from the Power Distribution Board 7.3.2 Front Panel Power Connector 7.3.3 Front Panel I/O Board Ribbon Cable Connector 7.3.4 LVD SCSI 68-pinConnector 7.3.5 SCA2 80-pinDrive Connectors 7.3.6Fans 7.3.7 Internal Logic Signals 7.4Electrical, Environmental, and Mechanical Specifications 7.4.1Electrical Specifications 7.4.1.2Hot-SwapSCSI Hard Disk Drive Supplied Power 7.4.1.3Power Supply Requirements 8.Front Panel I/O and Control Boards 8.1Introduction 8.1.1Block Diagram 8.1.2Architectural Overview 8.1.3Component Location 8.2Functional Architecture 8.2.1VGA 8.2.2USB 8.2.3NMI Button 8.3Signal Descriptions 8.3.1USB Connector 8.3.2Front Panel VGA Connector 8.4Electrical, Environmental, and Mechanical Specifications 8.4.1Electrical Specifications 8.4.2Connector Specifications 8.4.3Cooling Requirements 8.5Front Panel Control Module 8.5.1 Button Control Panel Page 8.5.2Intel® Local Control Panel 8.5.3 System ID Buttons and LEDs Page 9.SATA-to-IDEConverter Board 9.1Mechanical Outline Page 10. Regulatory Specifications 10.1 Important Safety Information 10.2 Intended Application Uses 10.3 Product Safety 10.4 Electromagnetic Compatibility (EMC) – Emissions and Immunity 10.5 Certifications / Registrations / Declarations 10.6 Regulatory Compliance Markings 10.7 Regional EMC Compliance Notices/Information Page Page Glossary Glossary Page Reference Documents