參數(shù)資料
型號: KSZ8851-16MLLI
廠商: Micrel Inc
文件頁數(shù): 10/84頁
文件大?。?/td> 0K
描述: IC MAC CTLR 1PORT W/BUS 48-TQFP
標準包裝: 250
控制器類型: 以太網(wǎng)控制器,MAC/PHY
接口: 總線
電源電壓: 1.8V,2.5V,3.3V
工作溫度: -40°C ~ 85°C
安裝類型: 表面貼裝
封裝/外殼: 48-LQFP
供應商設備封裝: 48-LQFP(7x7)
包裝: 托盤
產品目錄頁面: 1081 (CN2011-ZH PDF)
其它名稱: 576-3505
Micrel, Inc.
KSZ8851-16MLL/MLLI
March 11, 2014
18
Revision 2.2
MDI/MDI-X Auto Crossover
To eliminate the need for crossover cables between similar devices, the KSZ8851-16MLL supports HP-Auto MDI/MDI-X
and IEEE 802.3u standard MDI/MDI-X auto crossover. HP-Auto MDI/MDI-X is the default.
The auto-sense function detects remote transmit and receive pairs and correctly assigns the transmit and receive pairs for
the KSZ8851-16MLL device. This feature is extremely useful when end users are unaware of cable types in addition to
saving on an additional uplink configuration connection. The auto-crossover feature can be disabled through the port
control registers. The IEEE 802.3u standard MDI and MDI-X definitions are as below:
MDI
MDI-X
RJ45 Pins
Signals
RJ45 Pins
Signals
1
TD+
1
RD+
2
TD-
2
RD-
3
RD+
3
TD+
6
RD-
6
TD-
Table 2. MDI/MDI-X Pin Definitions
Straight Cable
A straight cable connects an MDI device to an MDI-X device or an MDI-X device to an MDI device. The following diagram
shows a typical straight cable connection between a network interface card (NIC) and a switch, or hub (MDI-X).
Figure 3. Typical Straight Cable Connection
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