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| 型號(hào)： | L84225 |
| 英文描述： | L84225 100BaseTX/FX/10BaseT Physical Layer Device technical manual 4/02 |
| 中文描述： | L84225 100BaseTX/FX/10BaseT物理層設(shè)備的技術(shù)手冊(cè)，4月2日 |
| 文件頁(yè)數(shù)： | 29/118頁(yè) |
| 文件大小： | 890K |
| 代理商： | L84225 |
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Functional Description
Copyright 1999-2002 by LSI Logic Corporation. All rights reserved.
29 of 118
April, 2002
The purpose of the waveform generator is to shape the output transmit
pulse. The waveform generator consists of a ROM, DAC, clock generator,
and filter. The DAC generates a stair-stepped representation of the
desired output waveform. The stairstepped DAC output then goes
through a low pass filter in order to "smooth" the DAC output and remove
any high frequency components. The DAC values are determined from
the ROM output; the ROM outputs are chosen to shape the pulse to the
desired template and are clocked into the DAC at high speed by the clock
generator. In this way, the waveform generator pre-shapes the output
waveform to be transmitted onto the twisted pair cable to meet the pulse
template requirements outlined in IEEE 802.3 Clause 14 and also shown
in
Figure 4
. The waveshaper replaces and eliminates external filters on
the TP transmit output.
The line driver converts the shaped and smoothed waveform to a current
output that can drive 100 meters of category 3/4/5 100 Ohm unshielded
twisted pair cable or 150 Ohm shielded twisted pair cable, without any
external filters. During the idle period, no output signal is transmitted on
the TP outputs (except link pulse).
2.9 Twisted Pair Receiver
2.9.1 Receiver - 100 Mbps
The TP receiver detects input signals from the twisted pair input and
converts it to a digital data bit stream ready for clock and data recovery.
The receiver can reliably detect data from a 100Base-TX compliant
transmitter that has been passed through 0-100 meters of 100-Ohm
category 5 UTP.
The 100 Mbps receiver consists of an adaptive equalizer, baseline
wander correction circuit, comparators, and MLT- 3 decoder. The TP
inputs first go to an adaptive equalizer. The adaptive equalizer
compensates for the low pass characteristic of the cable, and it has the
ability to adapt and compensate for 0-100 meters of category 5, 100
Ohm UTP. The baseline wander correction circuit restores the DC
component of the input waveform that was removed by external
transformers. The comparators convert the equalized signal back to
digital levels and are used to qualify the data with the squelch circuit. The
MLT-3 decoder takes the three level MLT-3 digital data from the
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