|
|
PDF XRS10L220 Data sheet ( Hoja de datos )
| Número de pieza | XRS10L220 | |
| Descripción | SERIAL ATA II: PORT MULTIPLIER / PORT SELECTOR | |
| Fabricantes | Exar Corporation | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de XRS10L220 (archivo pdf) en la parte inferior de esta página. Total 30 Páginas | ||
|
No Preview Available !
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
1 page  
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
5 Page 
EXSTOR - 1 XRS10L220
REV. 1.02
SERIAL ATA II: PORT MULTIPLIER / PORT SELECTOR
output XRS10L220, while PM port 15 is designated for communication between the host and the XRS10L220
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 XRS10L220 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 9.
FIGURE 9. PORT SELECTION SIGNAL - TRANSMITTED COMRESET SIGNALS
As defined in Serial ATA1.0
PM Port
FIS Type
3.5.1 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 XRS10L220 receives a frame as selected from one of the two available
hosts by the port selector, 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 XRS10L220 receives the frame and
performs the command or operation requested. If the frame is designated for a device port, the XRS10L220
obeys the following procedure:
1. The XRS10L220 first determines if the device port is valid. If the device port is not valid, the XRS10L220
will issue a SYNC primitive to the host and terminate reception of the frame.
2. The XRS10L220 determines if the X bit is set in the device port's PSCR[1] (SError) register. If the X bit is
set, the XRS10L220 issues a SYNC primitive to the host and terminates reception of the frame.
3. The XRS10L220 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 XRS10L220 will
finish receiving the frame from the host and will then issue an R_ERR primitive to the host as the ending
status. The XRS10L220 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 XRS10L220 initiates a transfer with the device by issuing an X_RDY primitive to the device. A collision
may occur as the XRS10L220 is issuing the X_RDY to the device if the device has started transmitting an
X_RDY primitive to the XRS10L220, indicating a decision to start a transmission to the host. In this case,
the XRS10L220 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 XRS10L220, the XRS10L220 will transmit the frame
from the host to the device. The XRS10L220 will not send an R_OK status primitive to the host until the
device has issued an R_OK primitive to indicate successful frame reception. In this way, the R_OK status
handshake is interlocked from the device to the host.
If an error is detected during any part of the frame transfer, the XRS10L220 will ensure that the error condition
is propagated to the host and the device. If no error occurs during frame transfer, the XRS10L220 will not alter
the contents of the frame, or modify the CRC in any way.
3.5.2 Transmission from a device to a host
A device indicates a transmit to a host in the same way as would be done if the host and device were attached
directly. This transaction obeys the following procedure:
1. After receiving an X_RDY primitive from the device, the XRS10L220 will determine if the X bit is set in the
device port's PSCR[1] (SError) register. The XRS10L220 will not issue an R_RDY primitive to the device
until this bit is cleared to zero.
11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet XRS10L220.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| XRS10L220 | SERIAL ATA II: PORT MULTIPLIER / PORT SELECTOR | Exar Corporation |
| Número de pieza | Descripción | Fabricantes |
| SLA6805M | High Voltage 3 phase Motor Driver IC. |
 Sanken |
| SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
 Analog Devices |
|
DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares, |
| DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |