参数资料
型号: KSZ8051MLL TR
厂商: Micrel Inc
文件页数: 14/48页
文件大小: 0K
描述: TXRX PHY 10/T100 3.3V MII 48LQFP
标准包装: 1,000
类型: PHY 收发器
驱动器/接收器数: 1/1
规程: MII
电源电压: 1.8V,2.5V,3.3V
安装类型: 表面贴装
封装/外壳: 48-LQFP
供应商设备封装: 48-LQFP(7x7)
包装: 带卷 (TR)
配用: 576-3864-ND - BOARD EVALUATION FOR KSZ8051MLL
Micrel, Inc.
KSZ8051MLL
July 2010
21
M9999-071210-1.0
HP Auto MDI/MDI-X
HP Auto MDI/MDI-X configuration eliminates the confusion of whether to use a straight cable or a crossover cable
between the KSZ8051MLL and its link partner. This feature allows the KSZ8051MLL to use either type of cable to connect
with a link partner that is in either MDI or MDI-X mode. The auto-sense function detects transmit and receive pairs from
the link partner, and then assigns transmit and receive pairs of the KSZ8051MLL accordingly.
HP Auto MDI/MDI-X is enabled by default. It is disabled by writing a one to register 1Fh, bit 13. MDI and MDI-X mode is
selected by register 1Fh, bit 14 if HP Auto MDI/MDI-X is disabled.
An isolation transformer with symmetrical transmit and receive data paths is recommended to support auto MDI/MDI-X.
Table 4 illustrates how the IEEE 802.3 Standard defines MDI and MDI-X.
MDI
MDI-X
RJ-45 Pin
Signal
RJ-45 Pin
Signal
1
TX+
1
RX+
2
TX-
2
RX-
3
RX+
3
TX+
6
RX-
6
TX-
Table 4. MDI/MDI-X Pin Definition
Straight Cable
A straight cable connects a MDI device to a MDI-X device, or a MDI-X device to a MDI device. Figure 4 depicts a typical
straight cable connection between a NIC card (MDI) and a switch, or hub (MDI-X).
Figure 4. Typical Straight Cable Connection
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