EXSTOR - 1 XRS10L220
SERIAL ATA II: PORT MULTIPLIER / PORT SELECTOR
AUGUST 2008
REV. 1.02
FEATURES
G
ENERAL
F
EATURES
•
Four independent 3/1.5Gbps SATA ports.
•
Connects 2 host ports to 2 device ports.
•
Supports 3/1.5Gbps rate detection/speed
negotiation.
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
•
Supports power down modes - Active, partial,
slumber and power down.
•
Advanced features configurable through MDIO
bus.
P
ORT
M
ULTIPLIER
/S
ELECTOR
L
OGIC
F
EATURES
•
Low latency architecture.
•
Supports OOB signaling for SATA applications.
Internal OOB detectors
COMINIT and COMWAKE.
H
IGH
S
PEED
I/O F
EATURES
for
COMRESET/
•
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.
P
HYSICAL
F
EATURES
•
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
Exar
Corporation 48720 Kato Road, Fremont CA, 94538
•
(510) 668-7000
•
FAX (510) 668-7017
•
www.exar.com
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.
F
IGURE
1. S
YSTEM
B
LOCK
D
IAGRAM FOR
XRS10L220
IN A
D
RIVE
E
NCLOSURE
A
PPLICATION
DRIVE ENCLOSURE
XRS10L220
SATA
Port
Selector
Port
Multiplier
SATA
2
EXSTOR - 1 XRS10L220
SERIAL ATA II: PORT MULTIPLIER / PORT SELECTOR
2.0 PIN DESCRIPTIONS
T
ABLE
1: XRS10L220 P
IN
D
ESCRIPTIONS
P
IN
N
AME
P
IN
N
UMBER
I/O
T
YPE
D
ATA
I
NTERFACE
SOTP0/SOTN0
SOTP1/SOTN1
SORP0/SORN0
SORP1/SORN1
SITP0/SITN0
SITP1/SITN1
SIRP0/SIRN0
SIRP1/SIRN1
68, 69
57, 56
65, 66
60, 59
93, 94
82, 81
90, 91
85, 84
I
O
I
O
CML
AC
Coupled
Serial ATA Output Transmitters. These ports communicate
from the XRS10L220 to downstream devices
Serial ATA Input Receivers. These ports receive signals
from downstream devices
Serial ATA Output Transmitters. These ports communicate
from the XRS10L220 to upstream hosts.
Serial ATA Input Receivers. These ports receive signals
from upstream hosts.
C
LOCK
I
NTERFACE
CMU_REFP/
CMU_REFN
46,
47
I
CML
AC
Coupled
Analog
Analog
Reference clock input
D
ESCRIPTION
REV. 1.02
XOD
XOG
43
44
0
I
Crystal oscillator output
Crystal oscillator input, 1.26V max
MDIO I
NTERFACE
S
IGNALS
MDC
MDIO
3
5
I
I/O
LVCMOS
LVCMOS
MDIO clock input, +3.3V LVCMOS
MDIO data port, +3.3V LVCMOS. Open drain
JTAG I
NTERFACE
S
IGNALS
TCK
TDI
TDO
96
100
99
I
I
O
LVCMOS
JTAG test clock, +3.3V LVCMOS
JTAG test data in, +3.3V LVCMOS
JTAG test data out, +3.3V LVCMOS. Open drain If used to
daisy chain JTAG devices, pull up externally using
3.3KOhm resistor.
JTAG mode select, +3.3V LVCMOS
JTAG test reset, +3.3V LVCMOS. Pull low externally using
3.3KOhm resistor for normal operation of the device.
TMS
TRST
97
1
I
I
G
ENERAL
C
ONTROL AND
C
ONFIGURATION
S
IGNALS
(CMOS)
RBIAS
RESETB
PWRDNB
DRACT[1:0]
49
75
52
73, 74
I
I
I
O
Analog
LVCMOS
LVCMOS
LVCMOS
Connection point for calibration termination resistor.
Active low reset pin, +3.3V LVCMOS.
Active low power down signal for chip, +3.3V LVCMOS.
Drive activity port for external LED. Active Low, 3.3V LVC-
MOS, open drain
4
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