KSZ8841-PMQL(2006) Просмотр технического описания (PDF) - Micrel

Номер в каталоге

Компоненты Описание

производитель

KSZ8841-PMQL
(Rev.:2006)

Single-Port Ethernet MAC Controller with PCI Interface

Micrel 

Micrel, Inc.

KSZ8841-PMQL

the decoder. When the input exceeds the squelch limit, the PLL locks onto the incoming signal and the KSZ8841-PMQL

decodes a data frame.

The receiver clock is maintained active during idle periods in between data reception.

MDI/MDI-X Auto Crossover

To eliminate the need for crossover cables between similar devices, the KSZ8841-PMQL 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 transmit and receive pairs for

the KSZ8841-PMQL 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:

RJ45

Pins

1

2

3

6

MDI

Signals

TD+

TD-

RD+

RD-

MDI-X

RJ45

Pins

Signals

1

RD+

2

RD-

3

TD+

6

TD-

Table 1. 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) (MDI) and a switch (MDIX) or

a hub (MDI-X).

June 2006

Figure 1. Typical Straight Cable Connection

17

M9999-061206-1.2

Share Link: