88SM4140 データシートの表示（PDF） - Unspecified

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88SM4140

Serial ATA II 1:4 Port Multiplier Solution

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Serial ATA II

1:4 Port Multiplier Solution

88SM4140

PRODUCT OVERVIEW

The Marvell¨ 88SM4140 port multiplier device offers the industryÕs 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 MarvellÕs

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

Control

UART/SEMB

Port Arbiter

PM_CTRL

FIFO

SEMB

Control

REFCLK

PLL

Port 0 PHY Port 1 PHY Port 2 PHY Port 3 PHY

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

¥ 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

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

¥ 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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