IP1000ALF-DS-R01 データシートの表示（PDF） - Unspecified

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IP1000ALF-DS-R01

Gigabit Ethernet NIC Single Chip

Unspecified 

IP1000A LF

Preliminary Data Sheet

2.1.2.3 Echo Canceller

With the proprietary architecture, the adaptive digital echo canceller further reduces the residual echo not

removed by the hybrid, the reflection due to patch cord impedance mismatch and non-ideal cable

characteristics.

2.1.2.4 NEXT Canceller

When IP1000A LF is operated in 1000BASE-T mode, it uses 4 pairs of wires to transmit and receive data

at the same time. This results in a detrimental near-end crosstalk between adjacent pairs and

significantly impairs the receiver performance. An adaptive digital NEXT canceller is implemented in

IP1000A LF to mitigate this effect.

2.1.2.5 Baseline Wander Canceller

IP1000A LF implements a digital adaptive baseline wander cancellation circuit to compensate DC shifts,

which are result of the DC loss from the transformer.

2.1.2.6 Feed-Forward Equalizer (FFE) and Decision-Feedback Equalizer (DFE)

The FFE and DFE of IP1000A LF are designed to remove inter-symbol interference. These fully adaptive

filters can track the inherently time-variant channel environment.

2.1.2.7 Digital Timing Recovery

IP1000A LF adopts a digital timing recovery scheme to accurately acquire the timing information at the

receiver side. This advanced digital timing recovery block reduces both long-term and short-term

frequency jitter to achieve as low bit error rate as possible. The maximum frequency offset it can track far

exceeds the requirement of the IEEE standard.

2.1.2.8 Decoder

The IP1000A LF implements different decoders for 1000BASE-T, 100BASE-TX, and 10BASE-T

respectively.

2.1.3 Transmit Function

2.1.3.1 Digital to Analog Converter (DAC)

The IP1000A LF incorporates a hightly integrated DAC to transmit Normal Link Pulse (NLP), Fast Link

Pulse (FLP), Manchester coded symbols, MLT3 waveform, or partial response PAM5 signals.

2.1.3.2 Encoder

The IP1000A LF implements different encoders for 1000BASE-T, 100BASE-TX, and 10BASE-T

respectively.

2.1.4 Link Function

2.1.4.1 Medium Dependent Interface (MDI)

The IP1000A LF transmits and receives data with all four pairs of wires in 1000BASE-T mode. If the

IP1000A LF is operated in 100BASE-TX or 10BASE-T mode, only one pair is responsible for transmitting

and the other for receiving data.

2.1.4.2 Automatic MDI/MDI-X Crossover and Pair Polarity Correction

The IP1000A LF is able to correct pair polarity errors in all modes. The automatic crossover function will

adjust MDI/MDI-X crossover condition for proper operation. In addition, the IP1000A LF can also correct

two types of abnormal cable configuration not compliant with the IEEE 802.3ab standard. This function

can be turned off by setting PHY register 20.2 to “0”.

Copyright © 2005, IC Plus Corp.

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July 5, 2005

IP1000A LF-DS-R08

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