LSISS9252 UG

LSISS9252SAS-to-SATA Bridge Interposer

User Guide

Preliminary, Version 1.1October 2009

LSI and the LSI logo are trademarks or registered trademarks of LSI Corporation or its subsidiaries. All other brand and product names may be trademarks of their respective companies.

This preliminary document describes a preproduction product and contains information that may change substantially for any final commercial release of the product. LSI Corporation makes no expressor implied representation or warranty as to the accuracy, quality, or completeness of information contained in this document, and neither the release of this document nor any information included in itobligates LSI Corporation to make a commercial release of the product. LSI Corporation reserves the right to make changes to the product(s) or information disclosed herein at any time without notice.LSI Corporation does not assume any responsibility or liability arising out of the application or use of any product or service described herein, except as expressly agreed to in writing by LSI Corporation;nor does the purchase, lease, or use of a product or service from LSI Corporation convey a license under any patent rights, copyrights, trademark rights, or any other of the intellectual property rightsof LSI Corporation or of third parties.

This document contains proprietary information of LSI Corporation. The information contained herein is not to be used by or disclosed to third parties without the express written permission of LSICorporation.

Corporate Headquarters Email WebsiteMilpitas, CA [email protected] www.lsi.com800-372-2447

Document Number: DB15-000481-03Copyright © 2009 LSI CorporationAll Rights Reserved

Revision History

Version and Date Description of Changes

Version 1.1, October 2009 Updated the photos of the interposer board.Updated several other graphics.Updated the documentation of the feature set.Updated the PCB Mechanical Dimensions figure.

Version 1.0, January 2009 Replaced previous placeholder photos of the interposer with actual photos.Updated references to SAS specification, SATA specification, and other specifications.Updated power specifications.Updated SAS and SATA connector pinout information.Updated UART information.Added Section 2.9, World Wide Name.Replaced the mechanical drawing with an updated one.Added Appendix A: Board Customization Options.Updated about half of the figures.Completed general editing and cleanup of the entire document.Changed default status of fuses on the 5-V and 12-V power rails from not implemented to implemented.

Version 0.6, June 2008 Updated Section 2.6, Functional Description.

Version 0.5, May 2008 Initial release of this advance document.

LSI Corporation Confidential | September 2009

Table of Contents

LSISS9252 SAS-to-SATA Bridge Interposer User Guide Table of Contents

Chapter 1: Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5

1.1 Purpose . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5

1.2 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6

Chapter 2: Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9

2.1 Functional Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9

2.2 Physical Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10

2.3 Electrical Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10

2.4 Thermal and Atmospheric Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10

2.5 SAS and SATA Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .102.5.1 SAS Port Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .112.5.2 SATA Port Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12

2.6 Functional Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .122.6.1 SAS and SATA Functionality . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .122.6.2 Flash Memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .132.6.3 Reference Clock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .132.6.4 HDD Power Control Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .132.6.5 HDD Presence Detect . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .132.6.6 HDD Spin-Up Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .142.6.7 Midplane Activity LED Control Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .142.6.8 SAS and SATA Precharge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .152.6.9 Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .162.6.10 LED Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .162.6.11 Power Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16

2.7 Compatibility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17

2.8 Constraints . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17

2.9 World Wide Name . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17

Chapter 3: Mechanical and Placement Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19

3.1 Physical Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19

Appendix A: Interposer Board Customization Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21

A.1 Customization Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21


LSISS9252 SAS-to-SATA Bridge Interposer User GuideTable of Contents


LSISS9252 SAS-to-SATA Bridge Interposer User Guide Chapter 1: Overview | Purpose

Chapter 1

1.1 Purpose This document provides preliminary information about the LSISS9252 bridge interposer. The LSISS9252 interposer board features the LSISS2520 device, which provides SAS-to-SATA bridging functionality. The LSISS9252 interposer supports communications between two SAS ports operating at up to 6Gb/s with one SATA port operating at up to 6Gb/s. For maximum performance, each port independently sends and receives data at the highest link rate achievable. For example, a 3Gb/s SATA drive connected to the LSISS9252 interposer board appears to a SAS2 host as a 6Gb/s SAS drive.

The LSISS9252 interposer provides a board-level product solution for customers who want to offer low-cost SATA drives in a SAS system.

The LSISS9252 interposer board uses a 2.5-inch form factor and supports full-speed SAS 2.0 and SATA 2.5 bridging functionality. The LSISS9252 interposer is currently available as a standard product.

The following figure shows front and back views of the LSISS9252 interposer board. The pen gives a general idea of the size of the board.

Figure 1: LSISS9252 Interposer Board

Overview


LSISS9252 SAS-to-SATA Bridge Interposer User GuideChapter 1: Overview | Features

The following figure shows how the LSISS9252 interposer board attaches to a 2.5-inch SATA disk drive.

Figure 2: LSISS9252 Interposer Board Attached to a 2.5-Inch SATA Drive

1.2 Features The LSISS9252 interposer board has the following features:

Supports the LSISS2520 device

Supports a SAS interface with these characteristics:

— Two 1.5Gbs, 3Gb/s, or 6Gb/s SAS ports— Compliant with the SAS 2.0 specification— Access through a standard vertical 29-pin SAS surface-mounted device (SMD)

connector with rivet mounting— Communicates with SAS host at highest supported link rate, independent of

SATA interface link rate

Supports a SATA interface with these characteristics:

— One 1.5Gb/s, 3Gb/s, or 6Gb/s SATA port— Compliant with the SATA 2.6 specification— Access through a standard vertical 22-pin SATA SMD connector with rivet

mounting

Uses a 12 V-only input supply

Has a clock reference, 25-MHz crystal

Uses HDD power control field-effect transistor (FET) circuitry

Supports 2-MB flash memory

Includes reset circuitry that supports power-on reset

Has a midplane LED buffer/driver circuit that includes source selection (HDD or LSISS2520 activity)


LSISS9252 SAS-to-SATA Bridge Interposer User Guide Chapter 1: Overview | Features

Includes an optional HDD presence detect on the SAS/SATA P4 pin

The following figure shows a high-level block diagram of the LSISS9252 interposer board.

Figure 3: LSISS9252 Interposer Board Block Diagram

HDD Power Control Circuit

LSISS2520

SA

S C

onne

ctor

Host0

SATA C

onnector

2-MB Flash Memory

25MHz XTAL

Onboard Power

Supplies

Reset Circuit

Filter

5 V, 12 V

12 V

Host1Device

3_00103-00


LSISS9252 SAS-to-SATA Bridge Interposer User GuideChapter 1: Overview | Features


LSISS9252 SAS-to-SATA Bridge Interposer User Guide Chapter 2: Functional Description | Functional Overview

Chapter 2

2.1 Functional Overview The LSISS9252 interposer board is a complete, functional board-level solution for SAS-SATA bridge applications, allowing you to use inexpensive SATA disk drives in a SAS storage environment. The LSISS2520 device on the interposer board supports communications between two SAS ports operating at up to 6Gb/s and one SATA port operating at up to 6Gb/s. This chapter explains SAS and SATA connector pinouts, HDD power control, HDD presence detect, HDD spin-up control, environmental specifications, and other physical aspects of the LSISS9252 interposer.

The following figure shows a detailed block diagram of the LSISS9252 interposer.

Figure 4: LSISS9252 Interposer Detailed Block Diagram

Functional Description

LSISS2520

2-MB Flash

31

SAT

A (2

2-pi

n)

XTAL CLK 25 MHz

PF XTAL

2

GPIO[1]

TXOP_H0

TXON_H0

RXIP_H0

RXIN_H0

TXOP_H1

TXON_H1

RXIP_H1

RXIN_H1

RESET

POR_N

SA

S (2

9-pi

n)

PWR

12 V5 V

12 V5 V

Onboard Supplies

TXOP_D

TXON_D

RXIP_D

RXIN_D

HDD PWR Control

3_00104-00


LSISS9252 SAS-to-SATA Bridge Interposer User GuideChapter 2: Functional Description | Physical Characteristics

2.2 Physical Characteristics The SAS and SATA connections on the LSISS9252 interposer board use surface-mounted vertical connectors. The SAS signals are accessible through a standard 29-pin connector. The SATA signals are accessible through a 22-pin standard connector.

See Chapter 3, Mechanical and Placement Considerations, for details of the board dimensions, the board outline, and the connector placements.

2.3 Electrical Characteristics The 12-V rail supplies all onboard power requirements of the LSISS9252 interposer board. The +12-V and +5-V supply inputs from the SAS connector are also routed to the HDD FET power control circuit. The switched power connects ultimately to the hard disk drive through the SATA connector power pins.

The total estimated power consumption for the LSISS9252 interposer on the 12-V supply is as follows:

Typical = 1.6 W. Typical power reflects typical voltage and power supply efficiency and typical current.

Maximum = 2.67 W. Maximum power reflects maximum voltage, current, and power supply inefficiency.

2.4 Thermal and Atmospheric Specifications

The LSISS9252 interposer board is designed to operate under the following thermal and atmospheric conditions:

2.5 SAS and SATA Specifications

The LSISS9252 interposer board supports the ANSI Serial Attached SCSI standard, version 2.0, and the Serial ATA (SATA) standard, version 2.6.

Operating Conditions

TemperatureHumidity Maximum Temperature Gradient

0 °C to 55 °C (32 °F to 131 °F)8% to 90% noncondensing20 °C/hour (36 °F/hour)

Shipping Conditions

Temperature Humidity

–40 °C to 85 °C (–40 °F to 185 °F)5% to 95% noncondensing

Storage Conditions

Temperature Humidity Storage Time Duration

–40 °C to 85 °C (–40 °F to 185 °F)5% to 95% noncondensing1 Year


LSISS9252 SAS-to-SATA Bridge Interposer User Guide Chapter 2: Functional Description | SAS and SATA Specifications

2.5.1 SAS Port Connection The native SAS port connection of the LSISS9252 interposer board uses a 29-pin standard vertical SMD connector. The following table lists the SAS connector pinout.

Table 1: SAS Connector Pinout

Pin No. Description Notes

S1 SGND_1 —

S2 A_RX+ Host Port 0 in production version

S3 A_RX- Host Port 0 in production version

S4 SGND_2 —

S5 A_TX- Host Port 0 in production version

S6 A_TX+ Host Port 0 in production version

S7 SGND_3 —

S8 SGND_4 —

S9 B_RX+ Host Port 1 in production version

S10 B_RX- Host Port 1 in production version

S11 SGND_5 —

S12 B_TX- Host Port 1 in production version

S13 B_TX+ Host Port 1 in production version

S14 SGND_6 —

P1 3.3V_1 NC

P2 3.3V_2 NC

P3 3.3V_3 NC

P4 GND_1 Optional HDD_PRESENCE_DETECT signal

P5 GND_2 —

P6 GND_3 —

P7 5V_1 To HDD switched power



P10 GND_4 —

P11 RSV Optional MP_ACTIVE_N signal

P12 GND_5 —

P13 12V_1 Input voltage and to HDD switched power




LSISS9252 SAS-to-SATA Bridge Interposer User GuideChapter 2: Functional Description | Functional Descriptions

2.5.2 SATA Port Connection The native SATA port connection of the LSISS9252 interposer uses a 22-pin standard vertical SMD connector. The following table lists the SATA connector pinout.

2.6 Functional Descriptions This section has detailed information about the various circuit blocks, configurations, and operational scenarios for the LSISS9252 interposer board. Refer to Appendix A for the LSISS9252 interposer default settings. Appendix A also lists alternative customization options.

2.6.1 SAS and SATA Functionality The LSISS2520 device provides the SAS and SATA functionality for the LSISS9252 interposer board. The high-speed SAS and SATA serial differential pairs are the most critical nets on the LSISS9252 interposer. The LSISS2520 device supports serial data rates of 1.5Gb/s to 6Gb/s, with fundamental frequency components up to 3.0 GHz. The relevant SAS and SATA industry standards recommend 0.01-μF DC blocking capacitors for the data transmission lines.

Table 2: SATA Connector Pinout

Pin No. Description Notes

S1 SGND_1 —

S2 TX+ Device Port

S3 TX- Device Port

S4 SGND_2 —

S5 RX- Device Port

S6 RX+ Device Port

S7 SGND_3 —

P1 3.3V_1 Optional UART connections



P4 GND_1 Optional HDD_PRESENCE_DETECT signal

P5 GND_2 —

P6 GND_3 —

P7 5V_1 Switched power to HDD



P10 GND_4 —

P11 RSV Optional HDD_ACTIVE_N signal and staggered spin-up select

P12 GND_5 —





LSISS9252 SAS-to-SATA Bridge Interposer User Guide Chapter 2: Functional Description | Functional Descriptions

The following figure shows the SAS and SATA circuit.

Figure 5: SAS and SATA Connections

2.6.2 Flash Memory The LSISS9252 interposer board supports a 2-MB flash device.

2.6.3 Reference Clock The LSISS2520 device uses a 25-MHz reference clock, which is provided by a 25-MHz fundamental mode crystal.

2.6.4 HDD Power Control Circuit The LSISS2520 device provides a GPIO pin that controls the +5-V and +12-V power to the HDD. This pin drives a FET control circuit that switches the power to the HDD. On the LSISS9252 interposer board, GPIO0 is dedicated for the FET control circuit.

The embedded firmware controls the toggling of the FET_CTL signal. One or more attached initiators can direct the firmware to toggle the FET_CTL signal by issuing the appropriate Mode Page command (see the LSISS2520 SAS-SATA Bridge System Application Reference Manual for details).

2.6.5 HDD Presence Detect Some applications require an HDD presence detection signal, routed to the midplane, that indicates whether a HDD is installed in the corresponding slot. The LSISS9252 interposer board allows you to optionally connect the SATA connector P4 to the SAS connector P4, as shown in the following figure.

Figure 6: HDD Presence Detect

LSISS2520

TXOP_H A

0.01

0.01

0.01

0.01TXON_H A

RXIN_H A

RXIP_H A

TXOP_H B

0.01

0.01

0.01

0.01TXON_H B

RXIN_H B

RXIP_H B

TXOP_D

TXON_D

RXIN_D

RXIP_D

0.01

0.01

0.01

0.01

SAS0 Port

SAS1 Port

Note:A See Table 1 (S2-S6)B See Table 1 (S9-S13)

S2

S3

S5

S6

S9

S10

S12

S13

SATA Port

S2

S3

S5

S6

3_00105-00

SAS Connector

P4

SATA Connector

P4

DNM

0HDD_PRESENCE_DETECT

3_00107-00



If you select this option, the HDD pulls the HDD_PRESENCE_DETECT signal to ground when it is installed, and it is open when no drive is installed. The midplane includes the appropriate sensing circuitry to use this signaling method.

2.6.6 HDD Spin-Up Options One or more attached initiators can direct the firmware to initiate the HDD spinup by sending a NOTIFY(ENABLE SPIN-UP) primitive or by issuing a START STOP UNIT command (see the LSISS2520 SAS-SATA Bridge System Application Reference Manual for details).

You can use an assembly option to configure the SATA HDD for either staggered spinup or immediate spinup when the power to the HDD is turned on. Use pin P11 on the SATA connector to set the spin-up method. Leave P11 unconnected (floating) to set the HDD for staggered spinup. Connect P11 to ground to set the HDD to spin-up immediately. Staggered spinup is the default configuration. The following figure shows the spin-up control options for HDD P11.

Figure 7: HDD Spin-Up Control Options

NOTE: P11 is a bidirectional signal that can also provide a HDD Activity output signal.

2.6.7 Midplane Activity LED Control Options

Although the LSISS9252 interposer board does not have any built-in LEDs, it provides several methods to control a midplane activity LED. The following table lists the control options.

SATA Connector

P11HDD_ACTIVITY_N

Install 0 ohm resistor for immediate spin-up. DNM

for staggered spin-up.

3_00108-00

Table 3: Midplane Activity Indicator Control Options

Item Midplane Activity LED Control HDD Spin-up Mode Notes

1 LSISS2520 controls midplane activity LED Staggered spinup Default mode

2 LSISS2520 controls midplane activity LED Immediate spinup —

3 No midplane activity LED control Staggered spinup —

4 No midplane activity LED control Immediate spinup —


LSISS9252 SAS-to-SATA Bridge Interposer User Guide Chapter 2: Functional Description | Functional Descriptions

NOTE: Because SATA P11 is a bidirectional pin that acts as both Activity and Spin-up control, the Activity and Spin-up functions are coupled. The embedded firmware controls the Activity LED. You can use the LED in different modes, such as static or different flash rates, based on different sources and events: for example, drive state, drive activity, or error conditions. One or more initiators can configure the LED characteristics by means of the appropriate Mode Page (refer to the LSISS2520 SAS-SATA Bridge System Application Reference Manual for details).

The following figure shows the configuration for midplane activity LED control.

Figure 8: Midplane Activity LED Control

The Activity signal is buffered from the LSISS2520 device to the midplane. The buffer ensures that SATA pin P11 does not go above 2.1 V, and it protects the LSISS2520 Activity pin from potentially higher voltages that could result if the midplane LED were connected to 5 VDC or higher.

By default, the ALTA_ACTIVITY_N signal is active low. When the SATA port is not ready, the LED is OFF (driven high). When the SATA port is ready and idle, the LED is ON (driven low). When the SATA port is transferring frames, the LED is blinking. You can specify an assembly option to configure the ALTA_ACTIVITY_N to be active high.

2.6.8 SAS and SATA Precharge The SAS and SATA connectors on the LSISS9252 interposer contain the following precharge pins for the power supplies:

P3: 3.3-V precharge pin

P7: 5-V precharge pin

P13: 12-V precharge pin

The interposer does not include any series resistors for precharging.

The SAS and SATA connector precharge pins limit the inrush current that occurs during a hot-plug operation. The precharge pins are physically longer than the normal power pins, so they make contact first during a hot-plug. A small value resistor in series with the precharge pins allows onboard capacitors to be charged at an R-C rate before the remaining pins make contact.

Option: Activity pin P11 from SATA Connector

LSISS2520

GPIO[2]

P11

SAS Connector MP_ACTIVITY_N ALTA_ACTIVITY_N

3_00109-00



Because the LSISS9252 interposer board is mated to the HDD, the drive sled is the hot-pluggable assembly. The SATA connector does not need precharge resistors because the HDD is not hot-plugged into the LSISS9252 interposer. The LSISS9252 SAS connector interface does not include precharge resistors, since they are also not generally included on SAS HDDs.

2.6.9 Reset The LSISS9252 interposer includes a system supervisor circuit that monitors the 3.3-V supply and provides a reset signal to the LSISS2520 device when necessary. The device provides a minimum power-on reset pulse width of 140 ms. The following figure shows the LSISS9252 reset/POR circuit.

Figure 9: Reset/POR Circuit

2.6.10 LED Indicators Because of space limitations, the LSISS9252 interposer does not contain any onboard LED indicators. See Section 2.6.7, Midplane Activity LED Control Options for midplane indicator options.

2.6.11 Power Supply The LSISS9252 interposer board generates all required voltages from the +12 VDC provided by the SAS connector. Power supply sequencing is implemented onboard. For safety, each regulator provides short-circuit protection and thermal shutdown. There is a fuse on each +5-V and +12-V power rail input. The following table and figure show the voltage and current requirements and the power supplies. The consumption data is preliminary. The final detailed circuit design will include additional information from the respective vendors of the components for more accurate figures.

LSISS2520

POR_N

POR_NSENSE

RESET

Reset

100K

VCC3V3

Reset

3_00111-00

Table 4: Voltage and Current Requirements

Name Level Current Description Requirements

VDD12 12.0 V 0.224 A Input (does not include HDD) 12.0 V ±5%


LSISS9252 SAS-to-SATA Bridge Interposer User Guide Chapter 2: Functional Description | Compatibility

Figure 10: Power Supplies

The 12-V input supply powers the LSISS9252 interposer board. The interposer then regulates this voltage down to supply the LSISS2520 device.

2.7 Compatibility The SAS interface is compatible with the ANSI Serial Attached SCSI standard, version 2.0. The SATA interface is compatible with the SATA specification, version 2.6. The LSISS2520 device is also compliant with SCSI/ATA Translation (SAT) 2.0.

2.8 Constraints The LSISS9252 interposer board is targeted to the 2.5-inch HDD form factor. The interposer attaches to the drive vertically (i.e., the interposer board plane height coincides with the thickness of the drive) in order to occupy as little space as possible in a drive tray. You can also use the interposer board in a 3.5-inch disk drive tray by using an appropriate bracket to securely hold the interposer board.

2.9 World Wide Name All LSI interposers are assigned a World Wide Name (WWN) at manufacturing time. The SAS addresses for the two SAS ports are derived from this WWN assignment. SAS addresses are derived such that WWN addresses need to be allocated in blocks of 4. For example, the following relationship must be satisfied:

(WWN & 0xfff…fffc) == WWN

The SAS address for Port 0 would then be WWN+1, and the SAS address for Port 1 would be WWN+2.

The WWN assignment resides in the nonvolatile configuration data for the interposer. Although it is possible to delete this assignment, LSI strongly advises against doing this. If you delete the assignment, it is possible that an embedded firmware algorithm could create duplicate WWN assignments.

GND

+5V

+12V

+3.3V

FET PWR Switch

SATA Connector

SAS Connector

GND

+5V

+12V

+3.3VNC NC

FET_CTL

Note: Fuses are implemented

Onboard Supplies

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LSISS9252 SAS-to-SATA Bridge Interposer User GuideChapter 2: Functional Description | World Wide Name


LSISS9252 SAS-to-SATA Bridge Interposer User Guide Chapter 3: Mechanical and Placement Considerations | Physical Dimensions

Chapter 3

3.1 Physical Dimensions The overall board size of the LSISS9252 interposer board is nominally 2.7 inches x 0.561 inches (68.63 mm x 14.25 mm). The LSISS9252 interposer board is mechanically backward-compatible with the previously released LSISS9135 (KT-22) interposer.

The following figure shows the physical characteristics of the LSISS9252 interposer board.

Figure 11: PCB Mechanical Dimensions

Mechanical and Placement Considerations


LSISS9252 SAS-to-SATA Bridge Interposer User GuideChapter 3: Mechanical and Placement Considerations | Physical Dimensions


LSISS9252 SAS-to-SATA Bridge Interposer User Guide Appendix A: Interposer Board Customization Guide | Customization Options

Appendix A

A.1 Customization Options The following table lists alternative customization options for the default LSISS9252 interposer board design settings. The middle column lists cross-references to descriptions of the settings elsewhere in this document

Contact the LSI Marketing group to request functions other than the specified defaults listed here. The board name is LSISS9252-01.

Interposer Board Customization Guide

Table 5: Customization Options for LSISS9252 Interposer Board

Default Board Design Settings See Section Customization Options

Enable Staggered Spin-Up on the SATA drive. Withhold the COMWAKE to the SATA drive at powerup. When either of the two SAS ports receives a NOTIFY(SPIN-UP), send the COMWAKE to the SATA drive to allow it to spin-up.

Section 2.6.6 Alternative Option: Staggered Spin-Up is disabled on the SATA drive. When the SATA drive is powered up, the out-of-band sequence (including COMWAKE) completes immediately.

The LSISS9252 interposer drives the midplane Activity-LED through the SAS connector pin P11 with buffered driver.

Section 2.6.7 Alternative Option #1: The SAS connector pin P11 is not driven at all (open).Alternative Option #2: The LSISS2520 device drives the SAS connector pin P11 directly, without buffer.

NOTE: The LSISS2520 device does not tolerate voltage levels higher than 3.3 V.

Alternative Option #3: The SAS connector pin P11 is driven from the SATA drive’s P11 with buffered driver.Alternative Option #4: The SAS connector pin P11 is directly driven from the SATA drive’s P11 without buffer.

Set Activity-LED Polarity as active low in order to work properly with the LSISS9252 LED buffer circuit.

Section 2.6.7 Alternative Option: The Activity-LED is active high.

Enable HDD Presence Detect. SAS connector pin P4 is tied directly to SATA connector pin P4.

Section 2.6.5 Alternative Option: Both the SAS and SATA connector pins P4 are tied to ground.

LSISS9252 UG

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