MTD981AG 查看數據表（PDF） - Myson Century Inc

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MTD981AG

10/100 Ethernet Transceiver

Myson Century Inc 

MYSON

TECHNOLOGY

MTD981A

4.2 Receive Function

In 100BASE-TX mode, the receive function includes a receiver with adaptive equalization and baseline

wander compensation, data and clock recovery at 125MHz, descrambling, and 5B to 4B decoding. An

energy detect circuit is also added to determine whether there is any signal energy on the media.

4.3 Link Monitor

In 100BASE-TX mode, when no signal or invalid signal is detected on the receiver pair, the link monitor will

enter the “link fail” state where only the scrambled idle code will be transmitted. When a valid signal is

detected for a minimum period of time, the link monitor will then enter the “link pass” state when transmit and

receive functions are entered.

5. 100BASE-FX

When configured to run in 100BASE-FX mode, either through hardware configuration or software

configuration, the MTD981A will support all the features and parameters of the industry standards.

5.1 Transmit Function

In 100BASE-FX mode, the 4B/5B encoded data stream bypass the scrambler. The output is NRZI PECL

signals. The PECL level signals are used to drive the transmitter of the fiber module.

5.2 Receive Function

In 100BASE-FX mode, the signal is received through the PECL receiver, and directly passed to the clock

recovery circuit for clock/data extraction. The descrambler is bypassed. The data still need 5B/4B decoding.

5.3 Link Monitor

In 100BASE-FX mode, the external fiber module performs the signal energy detection and communicates this

information directly to the SDP pin of MTD981A.

6. Auto-Negotiation

MTD981A implements Auto-Negotiation logic conforming to the 802.3u specification. The basic operation is based on

using Fast Link Pulse (FLP) to communicate information between link partners. The Auto-Negotiation takes three

phases to complete: advertising, detection and selection. The Auto-Negotiation mode can be optionally selected using

external pin selection SEL[0:2]. MTD981A also implements parallel detect function to allow compatibility with legacy

network devices.

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MTD981A Revision 1.2 02/19/2001

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