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Storage Solutions
Serial ATA II
1:4 Port Multiplier Solution
88SM4140
PRODUCT OVERVIEW
The Marvell 88SM4140 port multiplier device offers the industryOs first solution for port expansion. The device enables one active host connection to communicate with up to 4 Serial ATA disk drives. The device uses MarvellOs production-proven Serial ATA PHY technology and supports both 1.5 Gbps and 3.0 Gbps speeds with adjustable pre-emphasis and amplitude settings on all 5 ports (1 host, 4 device) for tuning high-speed, long-trace backplane implementations. The device also provides one Storage Enclosure Management Bridge (SEMB) port for communication with a Storage Enclosure Processor (SEP). Per the Serial ATA II specification, the 88SM4140 device supports command-based and FIS-based switching supporting simultaneous queued operations to all attached devices. The 88SM4140 product also supports a Marvell-proprietary mode called queued command based switching which enables the performance advantages of FIS-based switching but with reduced complexity.
Host PHY
UART/SEMB
UART Control SEMB Control
Port Arbiter
Serial ATA Host MUX PLL
PM_CTRL
FIFO
REFCLK
Port 0 PHY Serial ATA Device 0
Port 1 PHY Serial ATA Device 1
Port 2 PHY Serial ATA Device 2
Port 3 PHY Serial ATA Device 3
Fig 1. Serial ATA II Port Multiplier (88SM4140) Block Diagram
FEATURES
1.5/3.0 Gbps PHY operation FIS-based switching Queued command-based switching (Marvell Proprietary) 1 SEMB port Staggered HDD spin-up
BENEFITS
Supports next-generation HDD designs Superior performance by allowing the host to have outstanding commands to multiple devices at any point in time Allows performance advantages of FIS-based switching but with reduced complexity Allows connection to off-chip SEP for enclosure
SATA BIST over host and device links
Programmable pre-emphasis and amplitude per port Spread Spectrum Clocking (SSC) 1.2V and 3.3V power
Compatible with Marvell 88SX60xx Serial ATA II host controllers and 88SA8040 Parallel ATA to Serial ATA bridges
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Allows host-side control of HDD spin-up to manage power budget during system power-up Enable optimal per-port PHY tuning for Serial ATA backplane designs Reduces EMI for enterprise storage and server applications Reduces EMI for enterprise storage and server applications Interface flexibility End-to-end system interoperability
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Serial ATA II 1:4 Port Multiplier Solution
APPLICATIONS
The 88SM4140 1:4 Serial ATA II port multiplier, when combined with the CompanyOs market-leading 88SX60xx Serial ATA II 4 or 8-port host controllers, will enable enterprise-class port expansion inside storage arrays, RAID subsystems and servers. Further, the port multiplier is also ideal for next-generation home storage applications, enabling up to 1 Terabyte (1,000 GB) of storage expansion for video, audio and high-resolution graphics or photos inside digital set top boxes, digital video recorders (DVRs), or PCs and laptops. For example, 1 Terabyte of expanded storage could hold over 250,000 songs or over 1,000 fulllength feature films.
Processor
North Bridge
Memory
Server
External Serial ATA JBOD
I/O Hub
64-Bit PCI-X
Serial ATA Host Controller (88SX6081) 2
Serial ATA II 1:4 Port Multiplier (88SM4140)
Fig 2. Serial ATA Port Multiplier (88SM4140) Applications Diagram
THE MARVELL ADVANTAGE:
The Marvell 88SM4140 Serial ATA II port multiplier comes with a complete set of hardware and software development tools to assist engineers developing next generation storage networking solutions. MarvellOs worldwide field applications engineers collaborate closely with storage networking equipment vendors to develop and deliver innovative products to market. Marvell utilizes recognized world-leading semiconductor foundry and packaging services to reliably deliver high-volume and low cost total solutions. For more information, visit our website at www.marvell.com.
Marvell Semiconductor, Inc.
700 First Avenue Sunnyvale, CA 94089 Phone 408.222.2500 www.marvell.com
Copyright (c) 2004. Marvell International Ltd. All rights reserved. Marvell, the Marvell logo, Moving Forward Faster, Alaska, Fastwriter, GalNet, PHYAdvantage, and Prestera are registered trademarks of Marvell. Discovery, DSP Switcher, GalTis, Horizon, Libertas, Link Street, NetGX, RADLAN, Raising The Technology Bar, The Technology Within, UniMAC, Virtual Cable Tester, and Yukon are trademarks of Marvell. All other trademarks are the property of their respective owners. 88SM4140-001 02/04

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