參數(shù)資料
型號(hào): L80600
英文描述: L80600 10/100/1000 Mbits/s Ethernet PHY technical manual 3/01
中文描述: L80600 10/100/1000 Mbits /秒以太網(wǎng)PHY技術(shù)手冊(cè)3月1日
文件頁(yè)數(shù): 34/192頁(yè)
文件大?。?/td> 1344K
代理商: L80600
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2-20
Functional Description
result is a scrambled data stream with sufficient randomization to
decrease radiated emissions at certain frequencies by as much as
20 dB. The L80600 uses the PHY_ID (pins PHYAD [4:0]) to set a unique
seed value for the scramblers. The resulting energy generated by each
channel is out of phase with respect to each channel, thus reducing the
overall electromagnetic radiation.
2.5.4 NRZ to NRZI Encoder
After the transmit data stream has been serialized and scrambled, the
data is NRZI encoded to comply with the TP-PMD standard for
100BASE-TX transmission over Category-5 unshielded twisted-pair
cable. There is no ability to bypass this block within the L80600.
2.5.5 MLT-3 Converter/DAC/Line Driver
Binary to MLT-3 conversion is accomplished by converting the serial
NRZI data stream output from the NRZI encoder into two binary data
streams with alternately phased logic one events. These two binary
streams are then passed to a 100/1000 DAC and line driver that converts
the pulses to suitable analog line voltages. Refer to
Figure 2.7
.
Figure 2.7
NRZI to MLT-3 Conversion
The 100BASE-TX MLT-3 signal sourced by the TXDA
+/
line driver
output pins is slew rate controlled. This should be considered when
selecting AC coupling magnetics to ensure TP-PMD Standard compliant
transition times (3 ns < t
r
< 5 ns).
NRZI_in
MLT-3_plus
NRZI_in
MLT-3_plus
MLT-3_minus
Line
Driver
MLT-3/PAM-17
differential MLT-3
MLT-3
Converter
PAM-17_in
100/1000
DAC
20
MLT-3_minus
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