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參數(shù)資料
| 型號： | VSC7177 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | Enhanced 2:1 Port Selector for Serial ATA and Serial Attached SCSI |
| 中文描述： | 增強(qiáng)型2:1端口選擇器，用于串行ATA和串行連接SCSI |
| 文件頁數(shù)： | 8/24頁 |
| 文件大小： | 253K |
| 代理商： | VSC7177 |
8 of 24
Revision 4.2
July 29, 2005
Confidential
VSC7177
Data Sheet
Serial ATA II Protocol-Based Port Selection
Protocol-based port selection allows two hosts to negotiate for connection to a single device using OOB signaling.
The active host port in the VSC7177 may be selected using the protocol-based method defined in the Serial ATA II:
Port Selector 1.0 specification. Protocol-based port selection determines whether port 0 or port 1 is the active host
port connected to port 2 in this operating mode.
The Serial ATA II protocol-based port selection mode is enabled when MODE1 is LOW, MODE0 is HIGH,
PORTSEL1 is HIGH, and PORTSEL0 is LOW. Sideband-based port selection is disabled when Serial ATA II
protocol-based port selection mode is enabled.
Table 1,
page 5 shows all modes of operation. This section describes how the Serial ATA II: Port Selector standard
was implemented in the VSC7177.
Neither host port (port 0 or port 1) is active following power up and reset of the VSC7177. The output buffer in the
device port (port 2) is disabled (output is at DC-bias point) when there is no active host port. Data received by the
device port is transmitted to both host ports.
The VSC7177 supports presence detection per Serial ATA II: Port Selector 1.0 specification. A six-burst COMWAKE
signal is transmitted from each host port immediately after power up. A six-burst COMWAKE signal is transmitted
from a host port each time a valid COMRESET signal is received by that host port. The VSC7177 starts transmitting
the COMWAKE signal after it has detected the COMRESET signal is no longer being received from the host. The
COMWAKE signal is transmitted in response to receiving a COMRESET signal, regardless of that port’s being active
or inactive.
When there is no active host port, the first COMWAKE or COMRESET signal received by a host port selects that port
as the active host port. A COMRESET signal is transmitted out of the device port to the device, and the now active
host port is connected to the device port. If a COMWAKE or COMRESET signal is received by both host ports
simultaneously, port 0 is given priority and is selected as the active host port.
The VSC7177 detects a port selection signal received by an inactive host port. The port selection signal is a series of
five, valid COMRESET signals. The duration between the first and second COMRESET series and the third and
fourth COMRESET series is nominally 2.0 ms. The duration between the second and third COMRESET series and
the fourth and fifth COMRESET series is nominally 8.0 ms. After the entire fifth COMRESET series has been
deasserted, the inactive port that received the port selection signal is immediately switched to be the active host port.
Figure 3
shows the port selection signal. Maintaining primitive alignment is not guaranteed. Reception of
Figure 2. Reset State Machine (Edge-Sensitive Sideband Mode)
Reset State
Port 0 Selected
Port 1 Selected
PORTSEL0=0, PORTSEL1=1
and Reset=0
(PORTSEL0=1, PORTSEL1=1
or PORTSEL1=0)
and Reset=0
PORTSEL0
PORTSEL1
Reset=1
Reset=1
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