參數(shù)資料
型號(hào): KSZ8051MLL-EVAL
廠商: Micrel Inc
文件頁數(shù): 14/48頁
文件大小: 0K
描述: BOARD EVALUATION FOR KSZ8051MLL
標(biāo)準(zhǔn)包裝: 1
主要目的: 接口,以太網(wǎng) PHY
嵌入式:
已用 IC / 零件: KSZ8051MLL
已供物品:
相關(guān)產(chǎn)品: 576-3888-6-ND - TXRX PHY 10/T100 3.3V MII 48LQFP
576-3888-1-ND - TXRX PHY 10/T100 3.3V MII 48LQFP
576-3888-2-ND - TXRX PHY 10/T100 3.3V MII 48LQFP
KSZ8051MLL TR-ND - TXRX PHY 10/T100 3.3V MII 48LQFP
576-3731-ND - TXRX PHY 10/T100 3.3V MII 48LQFP
其它名稱: 576-3864
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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