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PDF XRS10L120 Data sheet ( Hoja de datos )
| Número de pieza | XRS10L120 | |
| Descripción | SERIAL ATA II: 1:2 PORT MULTIPLIER | |
| Fabricantes | Exar Corporation | |
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PRELIMINARY
XRS10L120
SERIAL ATA II: 1:2 PORT MULTIPLIER
DECEMBER 2006
REV. P1.0.1
GENERAL DESCRIPTION
The EXAR XRS10L120 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
XRS10L120 supports up to 2 SATA drives and utilizes
the full bandwidth of the host connection.
The upstream ports of XRS10L120 can also be
attached to a port selector (XRS10L210) or a Serial
ATA Switch to provide redundancy in a more complex
topology.
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
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.
XRS10L120 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 XRT10L120 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
XRS10L120 port multiplier is a multiplexer where one
active host connection is multiplexed to multiple
device connections. The XRS10L120 is an extensible
design that can support up to 2 device connections
and utilizes the full bandwidth of the host connection.
XRS10L120 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 and 1 are valid device ports within
the 2-output XRS10L120, while PM port 15 is
designated for communication between the host and
the XRS10L120 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
XRS10L120 fills in the PM Port field with the port
address of the device that is transmitting the frame.
STANDARDS COMPLIANCE
The XRS10L120 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
• Three 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
1 page  
REV. P1.0.1
1.0 PIN DESCRIPTIONS
FIGURE 2. PINOUT OF THE XRS10L120
PRELIMINARY
XRS10L120
SERIAL ATA II: 1:2 PORT MULTIPLIER
HBACT
NC
VSS
VDD
VSS
NC
NC
VDD
NC
NC
VSS
VDDA
VSSA
VSS
SiRP
SiRN
VDD
SiTP
SiTN
VSS
TCK
TMS
VDD
TDO
TDI
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
XRS10L120
50 VDDA
49 RBias
48 VSSA
47 CMU_REFN
46 CMU_REFP
45 VDDA
44 XOG
43 XOD
42 VSSA
41 VSS
40 NC
39 NC
38 VDD
37 PRN1
36 PRP1
35 VSS
34 VDDA
33 VSSA
32 VSS
31 PRP0
30 PRN0
29 VDD
28 NC
27 NC
26 VSS
3
5 Page 
PRELIMINARY
XRS10L120
REV. P1.0.1
SERIAL ATA II: 1:2 PORT MULTIPLIER
For speed negotiation with an upstream host, after the COMRESET/COMINIT and COMWAKE handshake is
complete, the XRS10L120 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 XRS10L120 will then step down and
attempt negotiation at the lower 1.5 Gbps data rate.
2.4 Port Multiplier Implementation
The XRS10L120 provides full support for the functionality outlined in the Serial ATA II Port Multiplier
specification.
A Serial ATA II Port Multiplier is a mechanism for a host connection to communicate with multiple devices. A
Port Multiplier is conceptually a simple multiplexer in which a host connection is multiplexed to multiple device
connections.
The XRS10L120 uses four bits, known as the PM Port field in all Serial ATA frame types, to route frames
between the host and the appropriate device. PM ports 0 and 1 are valid device ports within the 2-output
XRS10L120, while PM port 15 is designated for communication between the host and the XRS10L120 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 XRS10L120 fills in the PM Port field with the port
address of the device that is transmitting the frame.
The PM Port field is defined in the Serial ATA port multiplier specification to be the first 32-bit Dword in the
Frame Information Structure (FIS) for all FIS types, as shown in Figure 8.
FIGURE 8. PORT SELECTION SIGNAL - TRANSMITTED COMRESET SIGNALS
As defined in Serial ATA1.0
PM Port
FIS Type
2.5 Transmission from a Host to a Device
A host indicates the target device for receipt of a transmitted frame by setting the PM Port field in the frame to
the device's port address. When an XRS10L120 receives a frame as selected from the host, it checks the PM
Port field in the frame to determine which port address should be used. If the frame is set for transmission to
the control port (15), the XRS10L120 receives the frame and performs the command or operation requested. If
the frame is designated for a device port, the XRS10L120 obeys the following procedure:
1. The XRS10L120 first determines if the device port is valid. If the device port is not valid, the XRS10L120
will issue a SYNC primitive to the host and terminate reception of the frame.
2. The XRS10L120 determines if the X bit is set in the device port's PSCR[1] (SError) register. If the X bit is
set, the XRS10L120 issues a SYNC primitive to the host and terminates reception of the frame.
3. The XRS10L120 determines if a collision has occurred. A collision occurs when a reception is already in
progress from the device that the host wants to transmit to. If a collision has occurred, the XRS10L120 will
finish receiving the frame from the host and will then issue an R_ERR primitive to the host as the ending
status. The XRS10L120 will then discard the frame, but will not return an R_RDY primitive to the host until
the frame from the affected device port has been transmitted to the host, thus indicating to the host when it
can retry to send the frame. The transmission from the device will proceed as requested, as the device will
always take collision precedence over the host.
4. The XRS10L120 initiates a transfer with the device by issuing an X_RDY primitive to the device. A collision
may occur as the XRS10L120 is issuing the X_RDY to the device if the device has started transmitting an
X_RDY primitive to the XRS10L120, indicating a decision to start a transmission to the host. In this case,
the XRS10L120 will finish receiving the frame from the host and then issue an R_ERR primitive to the host
to indicate an unsuccessful transmission. The transmission from the device will proceed as requested, as
the device will always take collision precedence over the host.
5. After the device issues an R_RDY primitive to the XRS10L120, the XRS10L120 will transmit the frame
from the host to the device. The XRS10L120 will not send an R_OK status primitive to the host until the
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| PDF Descargar | [ Datasheet XRS10L120.PDF ] | |
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