88SM4140 Datasheet, PDF (1/2 Pages) List of Unclassifed Manufacturers – 1:4 Port Multiplier Solution

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
Â¥ 1.5/3.0 Gbps PHY operation
Â¥ FIS-based switching
Â¥ Queued command-based switching (Marvell Proprietary)
Â¥ 1 SEMB port
Â¥ Staggered HDD spin-up
Â¥ SATA BIST over host and device links
Â¥ Programmable pre-emphasis and amplitude per port
Â¥ Spread Spectrum Clocking (SSC)
Â¥ 1.2V and 3.3V power
Â¥ Compatible with Marvell 88SX60xx Serial ATA II host controllers
and 88SA8040 Parallel ATA to Serial ATA bridges
BENEFITS
Â¥ Supports next-generation HDD designs
Â¥ Superior performance by allowing the host to have outstanding
commands to multiple devices at any point in time
Â¥ Allows performance advantages of FIS-based switching but with
reduced complexity
Â¥ Allows connection to off-chip SEP for enclosure
Â¥ Allows host-side control of HDD spin-up to manage power budget
during system power-up
Â¥ Enable optimal per-port PHY tuning for Serial ATA backplane designs
Â¥ Reduces EMI for enterprise storage and server applications
Â¥ Reduces EMI for enterprise storage and server applications
Â¥ Interface flexibility
Â¥ End-to-end system interoperability