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XRS10L220 PDF Datasheet - SERIAL ATA II: PORT MULTIPLIER / PORT SELECTOR - Exar Corporation

Part Number XRS10L220
Description SERIAL ATA II: PORT MULTIPLIER / PORT SELECTOR
Manufacturers Exar Corporation 
Logo Exar Corporation Logo 
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XRS10L220 datasheet, circuit
EXSTOR - 1 XRS10L220
SERIAL ATA II: PORT MULTIPLIER / PORT SELECTOR
AUGUST 2008
REV. 1.02
FEATURES
GENERAL FEATURES
Four independent 3/1.5Gbps SATA ports.
Connects 2 host ports to 2 device ports.
Supports 3/1.5Gbps rate detection/speed
negotiation.
Supports power down modes - Active, partial,
slumber and power down.
Advanced features configurable through MDIO
bus.
PORT MULTIPLIER/SELECTOR LOGIC FEATURES
Low latency architecture.
Supports OOB signaling for SATA applications.
Internal OOB detectors for COMRESET/
COMINIT and COMWAKE.
HIGH SPEED I/O FEATURES
High speed outputs with programmable pre-
emphasis to drive long interconnects.
Selectable high speed input equalization for
optimum reception.
Compliant with SATA Gen-2i & Gen-2m
specification.
Enables reliable data transmission over 1 meter
of FR-4 and 4 meters or more of unequalized
copper cable.
Supports spread spectrum clocking (SSC) to
reduce EMI.
PHYSICAL FEATURES
CMOS 0.13 Micron Technology
Single 1.2 V Power Supply
-40°C to 85°C Industrial Temperature Range
No heatsink or airflow required
100-Pin LQFP Package
1.0 INTRODUCTION
The XRS10L220 provides the combined advantages
of the Serial ATA II Port Selector and Port Multiplier
implementations for Serial ATA II systems at 3.0
Gbps and 1.5 Gbps. Combining the capability to
address two Serial ATA devices from one external link
with support for a failover path from two independent
hosts, the XRS10L220 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, test and loopback features is achieved in a
low cost and lower power implementation.
The port selector function is used when dual hosts,
such as I/O controllers, must access single-port disk
drives in high availability storage subsystems where
redundancy and load sharing are important. The
outputs from the I/O controllers are multiplexed to a
Serial ATA drive through the port selector block of the
XRS10L220. Active/passive port selector in
XRS10L220 allows two different host ports to connect
to the same target in order to create a redundant path
to that target. In combination with RAID, the
XRS10L220 allows system providers to build fully
redundant solutions. This avoids the presence of a
single point of failure, and enables a fail-over path in
the case of host failure.
This port multiplier function is used when one active
host has to communicate with multiple SATA drives.
The XRS10L220 supports up to 2 SATA drives and
utilizes the full bandwidth of the host connection.
The XRS10L220 includes enhanced features such as
staggered HDD spin-up, power management control,
hot plug capability and support for legacy software.
The XRS10L220 acts as a retimer, maintaining
independent signaling domains between the drives,
hosts and the external interconnect.
The high-speed serial input feature: selectable
equalization adjustment 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.
XRS10L220 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.
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
XRS10L220 when needed. Receive equalization,
transmit amplitude and pre-emphasis and SSC
control are all configurable via the 2-wire MDIO
interface.
To summarize, the port multiplier functionality in the
XRS10L220 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
Exar Corporation 48720 Kato Road, Fremont CA, 94538 (510) 668-7000 FAX (510) 668-7017 www.exar.com

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XRS10L220 pdf, schematic
EXSTOR - 1 XRS10L220
SERIAL ATA II: PORT MULTIPLIER / PORT SELECTOR
REV. 1.02
connections for all of the drives in the enclosure. The port selector functionality in the XRS10L220 allows
replacement for expensive Fibre Channel drives with cost effective and high capacity SATA drives in enterprise
class applications without compromising on redundancy or performance.
STANDARDS COMPLIANCE
The XRS10L220 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 Selector, Revision 1.0
Serial ATA II: Port Multiplier, Revision 1.2
Serial ATA II: Revision 2.6
APPLICATIONS
Serial ATA Enclosures
Other Serial ATA link replicator applications
Buffers for externally connected links
High density storage boxes
RAID Subsystems
APPLICATION EXAMPLE
The XRS10L220 is ideally suited for use within an external drive enclosure as a means of providing redundant
host access to ensure system availability and reliability, while enabling access to up to two target devices per
XRS10L220. This application is shown in Figure 1. Other applications for the XRS10L220 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 XRS10L220 IN A DRIVE ENCLOSURE APPLICATION
DRIVEENCLOSURE
XRS10L220
SATA
Port Port
Selector Multiplier
SATA
2

2 Page

XRS10L220 equivalent
REV. 1.02
EXSTOR - 1 XRS10L220
SERIAL ATA II: PORT MULTIPLIER / PORT SELECTOR
TABLE 1: XRS10L220 PIN DESCRIPTIONS
PIN NAME
PIN NUMBER
I/O
TYPE
DESCRIPTION
HBACT
76 O LVCMOS 0 = Host 0 selected (status)
1 = No host selected (status)
0-1-0-1 Toggle = Host 1 selected (1 sec stay at each
state)
3.3V LVCMOS
PS_SIDEBAND_
B
77
I LVCMOS +3.3V LVCMOS
Please refer to Table 2, “Host Port Selection,” on
page 6
PORTSEL 2 I LVCMOS Port selector external input pin when this mode is set in
the register. Low selects host port 0, otherwise port 1.
+3.3V LVCMOS
TEST PIN
ANTEST
51 O Analog Analog test pin
CLKSTN/
CLKSTP
24, 25
O CML Output clock test pin
AC
Coupled
RESERVED PINS
NC 7, 8, 10, 11, 16,
17, 19, 20, 27,
28, 30, 31, 36,
37, 39, 40, 71,
72
No Connect
SCANMODE
41
I LVCMOS For factory use only. connect to ground.
POWER AND GROUND SIGNALS
VDD
9, 18, 23, 29,
38, 54, 58, 67,
79, 83, 92, 98
I
1.2V supply.
VDDA
14, 34, 45, 50,
62, 87
I
1.2V Analog supply.
VSS
4, 6, 12, 15, 21,
22, 26, 32, 35,
53, 55, 61, 64,
70, 78, 80, 86,
89, 95
I
Ground.
VSSA
13, 33, 42, 48,
63, 88
I
Analog Ground.
5

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XRS10L220 diode, scr
EXSTOR - 1 XRS10L220
REV. 1.02
SERIAL ATA II: PORT MULTIPLIER / PORT SELECTOR
3.2 Power Down Modes
The XRS10L220 features independent support for the 3 power modes, as follows:
Active: All parts of the link are active. All power-down signals are de-asserted.
Partial: In partial mode, the input and output pipelines are shut down, but the PLL and the OOB generation
circuits are active.
Slumber: In slumber mode, the PLL is also shut down, saving additional power but adding latency on exit.
The XRS10L220 transceiver components (transmitter, receive CDR, PLL, etc.) can be powered down through
MDIO register settings. Please refer to Table 13, “Powerdown Registers (MDIO Devices 1, 2),” on page 27
Please refer to “XRS10L220/120 Errata Sheet” for details regarding Link Power Management.
3.3 Speed Negotiation
The XRS10L220 will automatically perform speed negotiation with the host and devices in order to verify
whether the second generation Serial ATA 3.0 Gbps data rate is available or whether the system will need to
fall back upon the first generation Serial ATA 1.5 Gbps data rate. Speed negotiation is performed on an
independent basis by each of the dual-channel macros. Speed negotiation is done independently on all host
and device ports by default. MDIO configuration can request a common negotiated speed on the host and
device ports if such a speed exists. To perform speed negotiation with a downstream device, the XRS10L220
will first perform a COMRESET/COMINIT handshake with the device and then performs a calibrate/
COMWAKE handshake. Following receipt of the device COMWAKE signal, the XRS10L220 will continually
send out a D10.2 signal while awaiting receipt of the device ALIGN primitive. Depending on the speed of the
ALIGN primitive, the XRS10L220 will be able to determine the PHY generation of the device, and provide the
appropriate 1.5 Gbps or 3.0 Gbps ALIGN primitive in return to the device, thus completing speed negotiation.
This process is outlined in Figure 7.
FIGURE 7. SERIAL ATA SPEED NEGOTIATION
For speed negotiation with an upstream host, after the COMRESET/COMINIT and COMWAKE handshake is
complete, the XRS10L220 will initially send out an ALIGN primitive at the 2nd generation 3.0 Gbps data rate. If
no confirming 3.0 Gbps ALIGN primitive is received from the host, the XRS10L220 will then step down and
attempt negotiation at the lower 1.5 Gbps data rate.
3.4 Port selector Implementation
The XRS10L220 provides full support for the Serial ATA II Port Selector specification. A Serial ATA Port
Selector is a mechanism that allows two different host ports to connect to the same device in order to create a
redundant path to that device. Only one host connection to the device is active at a time.
9

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XRS10L220 transistor, igbt
REV. 1.02
Name
VESD1
VESD2
θJA
EXSTOR - 1 XRS10L220
SERIAL ATA II: PORT MULTIPLIER / PORT SELECTOR
TABLE 8: OPERATING CONDITIONS
Description
Min Nom Max
Units
Electrostatic discharge tolerance, Human Body Model -
Any pin with respect to any other pin except VDDA pins
(pins 14, 34, 45, 50, 62, and 87)
-1400
1400
V
Electrostatic discharge tolerance, Human Body Model -
Any pin with respect to VDDA pins (pins 14, 34, 45, 50,
62, and 87)
-300
300 V
Junction-to-ambient thermal resistance
38.5
0C/W
21

21 Page





Information Total 30 Pages
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