參數(shù)資料
型號(hào): KSZ8851SNLI TR
廠商: Micrel Inc
文件頁數(shù): 9/80頁
文件大小: 0K
描述: IC ETHERNET CTLR 1PORT PCI 32MLF
標(biāo)準(zhǔn)包裝: 1
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: 32-VFQFN 裸露焊盤,32-MLF?
供應(yīng)商設(shè)備封裝: 32-MLF?(5x5)
包裝: 標(biāo)準(zhǔn)包裝
產(chǎn)品目錄頁面: 1081 (CN2011-ZH PDF)
其它名稱: 576-3506-6
Micrel, Inc.
KSZ8851SNL/SNLI
August 2009
17
M9999-083109-2.0
MDI/MDI-X Auto Crossover
To eliminate the need for crossover cables between similar devices, the KSZ8851SNL 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 KSZ8851SNL 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
Crossover Cable
A crossover cable connects an MDI device to another MDI device, or an MDI-X device to another MDI-X device. The
following diagram shows a typical crossover cable connection between two chips or hubs (two MDI-X devices).
Receive Pair
Transmit Pair
Receive Pair
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
Transmit Pair
Modular Connector
(RJ-45)
NIC
Straight
Cable
10/100 Ethernet
Media Dependent Interface
10/100 Ethernet
Media Dependent Interface
Modular Connector
(RJ-45)
HUB
(Repeater or Switch)
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