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Exar Corporation

XRS10L140 Datasheet Preview

XRS10L140 Datasheet

SERIAL ATA II: 1:4 PORT MULTIPLIER

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PRELIMINARY
XRS10L140
SERIAL ATA II: 1:4 PORT MULTIPLIER
JUNE 2006
REV. P1.0.2
1.0 INTRODUCTION
The EXAR XRS10L140 is a Serial ATA port multiplier
designed for next generation enterprise class disk
array systems that use SATA mid-planes. The device
is targeted at low cost storage applications.
This function is used when one active host has to
communicate with multiple SATA drives. The
XRS10L140 supports up to 4 SATA drives and utilizes
the full bandwidth of the host connection.
The upstream ports of XRS10L140 can also be
attached to a port selector (XRS10L20) or a Serial
ATA Switch to provide redundancy in a more complex
topology.
The XRS10L140 includes enhanced features such as
staggered HDD spin-up, power management control,
hot plug capability and support for legacy software.
The XRS10L140 acts as a retimer, maintaining
independent signaling domains between the drives
themselves and the external interconnect.
The high-speed serial input features selectable
equalization adjustment and the high-speed serial
output features selectable pre-emphasis to
compensate for ISI (Inter-Symbol Interference) and
increase maximum cable distances.
XRS10L140 meets tight jitter budgets in SATA
applications. Exar's serial I/O technology enables
reliable data transmission over 1 meter or more of
FR-4 and 15 meters or more of unequalized copper
cable.
Host and drive port speeds can be mixed and
matched, based upon inherent data rate negotiation
present in the SATA II specifications.
The MDIO bus allows simple configuration of the
device.
To summarize, the XRT10L24 port multiplier device
allows the system designer to increase the number of
serial ATA connections in an enclosure that does not
have a sufficient number of serial ATA connections for
all of the drives in the enclosure.
OVERVIEW OF PORT MULTIPLIER LOGIC
XRS10L140 port multiplier is a multiplexer where one
active host connection is multiplexed to multiple
device connections. The XRS10L140 is an extensible
design that can support up to 4 device connections
and utilizes the full bandwidth of the host connection.
XRS10L140 uses four bits, known as the PM Port
field in all Serial ATA frame types, to route frames
between the selected host and the appropriate
device. PM ports 0 through 3 are valid device ports
within the 4-output XRS10L140, while PM port 15 is
designated for communication between the host and
the XRS10L140 itself. For host-to-device
transactions, the PM Port field is designated by the
host in order to specify which device the frame is
intended for. For device-to-host transactions, the
XRS10L140 fills in the PM Port field with the port
address of the device that is transmitting the frame.
STANDARDS COMPLIANCE
The XRS10L140 is compliant with the following
industry specifications:
Serial ATA, Revision 1.0a
Serial ATA II: Extensions to Serial ATA 1.0a,
Revision 1.2
Serial ATA II PHY Electrical Specifications,
Revision 1.0
Serial ATA II: Port Multiplier, Revision 1.2
APPLICATIONS
Serial ATA Enclosures
Other Serial ATA link replicator applications
Buffers for externally connected links
High density storage boxes
RAID Subsystems
FEATURES
GENERAL FEATURES
Five independent 3/1.5G SATA ports.
Supports 3/1.5G rate detection/speed negotiation.
Supports power down modes - Active, partial,
slumber and power down.
PORT MULTIPLIER LOGIC FEATURES
Low latency architecture.
Supports OOB signaling for SATA applications.
Internal OOB detectors for COMSAS, COMRESET/
COMINIT and COMWAKE.
TEST AND CONTROL FEATURES
Supports MDIO Bus.
Outputs for various failure modes.
Built-In self test mode through the MDIO bus.
Supports various loopback modes.
Exar Corporation 48720 Kato Road, Fremont CA, 94538 (510) 668-7000 FAX (510) 668-7017 www.exar.com




Exar Corporation

XRS10L140 Datasheet Preview

XRS10L140 Datasheet

SERIAL ATA II: 1:4 PORT MULTIPLIER

No Preview Available !

XRS10L140
PRELIMINARY
SERIAL ATA II: 1:4 PORT MULTIPLIER
REV. P1.0.2
HIGH SPEED I/O FEATURES
High speed outputs with selectable pre-emphasis to extend the link budgets.
High speed input equalization for improved signal integrity.
Compliant with SATA Gen2i & Gen2 specification.
Enables reliable data transmission over 1 meter or more of FR-4 and 15 meters or more of unequalized
copper cable.
Supports spread spectrum clocking to reduce EMI.
PHYSICAL FEATURES
CMOS 0.13 Micron Technology
Single 1.2 V Power Supply
-40°C to 85°C Industrial Temperature Range
2000 V ESD Rating on All Pins
No heatsink or airflow required
100-Pin QFP Package
APPLICATION EXAMPLE
The XRS10L140 is ideally suited for use within an external drive enclosure as a means of providing access to
up to four target devices per XRS10L140. This application is shown in Figure 1. Other applications for the
XRS10L140 include use in fixed-content or network attached storage systems, storage arrays, desktop
applications or entry-level servers, RAID storage or disk-to-disk backup.
FIGURE 1. SYSTEM BLOCK DIAGRAM FOR XRS10L140 IN A DRIVE ENCLOSURE APPLICATION
D R IV E EN C LO S U R E
X R T 10L140
PO R T M ULTIPLIER
X R T 10L140
PO R T M ULTIPLIER
SATA
SATA
SATA
SATA
SATA
SATA
SATA
SATA
2


Part Number XRS10L140
Description SERIAL ATA II: 1:4 PORT MULTIPLIER
Maker Exar Corporation
Total Page 30 Pages
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