88SM4140 データシートの表示（PDF） - Marvell Semiconductor
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88SM4140 Datasheet PDF : 112 Pages
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88SM4140 Preliminary Specifications
Serial ATA 3.0 Gbps: 1-to-4 Port Multiplier
1 OVERVIEW
The 88SM4140 is a Serial ATA (SATA) Port Multiplier (PM) that allows an active host
connection to communicate with up to four device ports and one SEMB port. The 88SM4140
is used to consolidate the capacity of storage devices by allowing a single host SATA port to
be connected to more than one SATA device. This port multiplier employs Marvell’s SATA 3.0
Gbps Physical Layer (Phy) technology.
The 88SM4140 recognizes the SATA-defined OOB sequence and speed negotiation
sequence on all five of its SATA ports, and has programmable amplitude and pre-emphasis
settings for a range of drive capabilities to support various backplane and cabling
environments. The arbiter receives all the requests from the host port, the device ports, and
the control port if these ports can transmit a FIS to the host port. The control port has the
highest arbitration priority. The priority of the other ports is determined by a fair priority
algorithm.
All device ports and the host port can be set up via the host port or UART interface to perform
Serial ATA self-tests at the same time.
The PHYTEST module is specifically used to test the Serial ATA Phy. All the test patterns are
referenced from SATA Test Patterns and the High Speed Serialized Attachment specification.
Figure 1-1 88SM4140 Overview
HDD
Host Bus Adapter
HDD
HDD
HDD
Copyright © 2007 Marvell Technology Group, Ltd.
Do not duplicate without permission. Document Classification: Proprietary
1-1
February 1, 2007
Doc No. MV-S101553-00 Rev. G
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