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參數(shù)資料
| 型號(hào)： | 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)： | 10/24頁 |
| 文件大?。?/td> | 253K |
| 代理商： | VSC7177 |
10 of 24
Revision 4.2
July 29, 2005
Confidential
VSC7177
Data Sheet
Status Signals—Serial ATA II Protocol-based Port Selection
The P0SLTD output indicates the active host port. P0SLTD is LOW when port 1 is active and HIGH when port 0 is
active. P0SLTD is a logic HIGH when neither host port is active.
OOBPORT0 reports the state of the inactive host port’s OOB detector. OOBPORT0 reports the state of the OOB
detector from port 0’s input receiver when there is no active host.
There is no active host following a reset of the VSC7177.
Table 5
contains a summary of the protocol-based port selection operating mode.
1.
OFF indicates the output driver is transmitting a common-mode state.
High-Speed Outputs
Each port has a high-speed output buffer that transmits the differential serial ATA data at rates up to 3.0 Gbps. The
output pins for the ports are P0OUTP/N, P1OUTP/N, and P2OUTP/N. Each output buffer has an input to indicate
when OOB signals are being transmitted and a single input to control the output voltage amplitude and to enable pre-
emphasis.
Transmitting OOB Signals
Both differential output signals are at the DC-bias voltage when the output buffer is disabled. The output buffer is
disabled when OOB signals are transmitted and when an output port is turned “off” as described in
“Modes of
Operation,”
page 5.
Table 5. Operating Modes for Serial ATA II Protocol-based Port Selection
Active Host Port
Output Pins
P0OUT
P1OUT
P2OUT
P0SLTD
OOBPORT0
Port 0
P2IN
OFF
(1)
P0IN
1
OOBPORT1
Port 1
OFF
(1)
P2IN
P1IN
0
OOBPORT0
No active host
P2IN
P2IN
OFF
(1)
1
OOBPORT0
Figure 4. High-Speed Output Buffer
Output
OutputN
Data
TX Common Mode
HIV
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