KSZ8051MLL 查看數據表（PDF） - Micrel

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KSZ8051MLL

10Base-T/100Base-TX Physical Layer Transceiver

Micrel 

Micrel, Inc.

KSZ8051MLL

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

RJ-45 Pin

1

2

3

6

Signal

TX+

TX-

RX+

RX-

MDI-X

RJ-45 Pin

Signal

1

RX+

2

RX-

3

TX+

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).

July 2010

Figure 4. Typical Straight Cable Connection

21

M9999-071210-1.0

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