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XRS10L220 Datasheet PDF


XRS10L220 - 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
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XRS10L220 pdf, equivalent, 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
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XRS10L220 transistor, diode fet, igbt, 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.
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XRS10L220The function of this parts is a SERIAL ATA II: PORT MULTIPLIER / PORT SELECTOR.Exar Corporation
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