EXSTOR XRS10L120
SERIAL ATA II: PORT MULTIPLIER
REV. 1.06
JUNE 2009
FEATURES
test and loopback features is achieved in a low cost
and lower power implementation.
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ENERAL FEATURES
The port multiplier function is used when one active
host has to communicate with multiple SATA drives.
The XRS10L120 supports up to 2 SATA drives and
utilizes the full bandwidth of the host connection.
Three independent 3/1.5Gbps SATA ports.
Connects 1 host port to 2 device ports.
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Supports 3/1.5Gbps rate detection/speed
negotiation.
The XRS10L120 includes enhanced features such as
staggered HDD spin-up, power management control,
hot plug capability and support for legacy software.
The XRS10L120 acts as a retimer, maintaining
independent signaling domains between the drives,
hosts and the external interconnect.
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Supports power down modes - Active, partial,
slumber and power down.
Advanced features configurable through MDIO
bus.
The high-speed serial input feature: selectable
equalization and the high-speed serial output feature:
programmable pre-emphasis can be used to
compensate for ISI (Inter-Symbol Interference) and
increase maximum cable distances.
P
ORT MULTIPLIER LOGIC FEATURES
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Low latency architecture.
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Supports OOB signaling for SATA applications.
Internal OOB detectors for COMRESET/
COMINIT and COMWAKE.
XRS10L120 meets tight jitter budgets in SATA
applications. Exar's serial I/O technology enables
reliable data transmission over 1 meter of FR-4 and 4
meters of unequalized copper cable.
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IGH SPEED I/O FEATURES
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High speed outputs with programmable pre-
emphasis to drive long interconnects.
Host and drive port speeds can be mixed and
matched, based upon inherent data rate negotiation
present in the SATA II specifications.
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Selectable high speed input equalization for
optimum reception.
Compliant with SATA Gen-2i
specification.
&
Gen-2m
The MDIO bus allows simple configuration of the
XRS10L120 when needed. Receive equalization,
transmit amplitude and pre-emphasis and SSC
control are all configurable via the 2-wire MDIO
interface
Enables reliable data transmission over 1 meter
of FR-4 and 4 meters or more of unequalized
copper cable.
To summarize, the port multiplier functionality in the
XRS10L120 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.
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Supports spread spectrum clocking (SSC) to
reduce EMI.
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HYSICAL FEATURES
CMOS 0.13 Micron Technology
Single 1.2 V Power Supply
STANDARDS COMPLIANCE
-40°C to 85°C Industrial Temperature Range
No heatsink or airflow required
64-Pin QFN Package
The XRS10L120 is compliant with the following
industry specifications:
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Serial ATA, Revision 1.0a
1.0 INTRODUCTION
Serial ATA II: Extensions to Serial ATA 1.0a,
Revision 1.2
The XRS10L120 provides the advantages of the
Serial ATA II Port Multiplier implementations for Serial
ATA II systems at 3.0 Gbps and 1.5 Gbps. The
XRS10L120 offers a leading solution for propagation
of high data rate Serial ATA products in a wide variety
of applications. The integration of Serial ATA PHY
links, a variety of digital logic capabilities, rate adjust
FIFOs, integrated low-cost clock oscillator support,
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Serial ATA II PHY Electrical Specifications,
Revision 1.0
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Serial ATA II: Port Multiplier, Revision 1.2
Serial ATA II: Revision 2.6
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • (510) 668-7000 • FAX (510) 668-7017 • www.exar.com
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