PIC18F452-I/ML【PDF 34/134 页】IC MCU FLASH 16KX16 A/D 44QFN

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Micrel, Inc.

KSZ8864RMN

April 2012

M9999-043012-1.5

10BASE-T Transmit

The output 10BASE-T driver is incorporated into the 100BASE-T driver to allow transmission with the same magnetics.

They are internally wave-shaped and pre-emphasized into outputs with a typical 2.3V amplitude. The harmonic contents

are at least 27dB below the fundamental when driven by an all-ones Manchester-encoded signal.

10BASE-T Receive

On the receive side, input buffer and level detecting squelch circuits are employed. A differential input receiver circuit and

a PLL perform the decoding function. The Manchester-encoded data stream is separated into clock signal and NRZ data.

A squelch circuit rejects signals with levels less than 400mV or with short pulse widths in order to prevent noises at the

RXP or RXM input from falsely triggering the decoder. When the input exceeds the squelch limit, the PLL locks onto the

incoming signal and the KSZ8864RMN 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 KSZ8864RMN 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

KSZ8898MQ/TMQ device. This feature is extremely useful when end users are unaware of cable types, and also, saves

on an additional uplink configuration connection. The auto-crossover feature can be disabled through the port control

registers, or MIIM PHY registers. The IEEE 802.3u standard MDI and MDI-X definitions are:

MDI

MDI-X

RJ-45 Pins

Signals

RJ-45 Pins

Signals

TD+

RD+

TD-

RD-

RD+

TD+

RD-

TD-

Table 1. MDI/MDI-X Pin Definitions

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