參數(shù)資料
型號(hào)： AM79C873KCW
廠商： ADVANCED MICRO DEVICES INC
元件分類： 網(wǎng)絡(luò)接口
英文描述： NetPHY⑩ -1 10/100 Mbps Ethernet Physical Layer Single-Chip Transceiver with 100BASE-FX Support
中文描述： DATACOM, ETHERNET TRANSCEIVER, PQFP100
封裝： PLASTIC, QFP-100
文件頁(yè)數(shù)： 16/44頁(yè)
文件大?。?/td> 543K
代理商： AM79C873KCW
16
Am79C873
P R E L I M I N A R Y
MLT-3 Driver
The two binary data streams created at the MLT-3 con-
verter are fed to the twisted pair output driver which
converts these streams to current sources and alter-
nately drives either side of the transmit transformer pri-
mary winding resulting in a minimal current MLT-3
signal. Refer to Figure 4 for the block diagram of the
MLT-3 converter.
100BASE Receiver
The 100BASE receiver contains several function
blocks that convert the scrambled 125 Mbps serial data
to synchronous 4-bit nibble data that is then provided to
the MII.
The receive section contains the following functional
blocks:
I
Signal Detect
I
Adaptive Equalization
I
MLT-3-to-Binary Decoder
I
Clock Recovery Module
I
NRZI -o-NRZ Decoder
I
Serial-to-Parallel Converter
I
Descrambler
I
Code Group Alignment
I
4B5B Decoder
100BASE-TX Signal Detect
The signal detect function meets the specifications man-
dated by the ANSI XT12 TP-PMD 100BASE-TX stan-
dards for both voltage thresholds and timing parameters.
Figure 4.
MLT-3 Converter Block Diagram
100BASE-FX Signal Detect
The NetPHY-1 device accepts signal detect information
on the FXSD pin at PECL signal levels from the FX
Optical Module.
Adaptive Equalization
When transmitting data at high speeds over copper
twisted pair cable, attenuation based on frequency be-
comes a concern. In high speed twisted pair signaling,
the frequency content of the transmitted signal can
vary greatly during normal operation based on the ran-
domness of the scrambled data stream. This variation
in signal attenuation caused by frequency variations
must be compensated for to ensure the integrity of the
received data.
In order to ensure quality transmission when employing
MLT-3 encoding, the compensation must be able to
adapt to various cable lengths and cable types depend-
ing on the installed environment. The selection of long
cable lengths for a given implementation, requires sig-
nificant compensation which will be over-kill in a situa-
tion that includes shorter, less attenuating cable
lengths. Conversely, the selection of short or intermedi-
ate cable lengths requiring less compensation will
D
CKQ
Q
Binary In
Binary minus
Binary plus
MLT-3
MLT-3
Binary In
Common
Driver
22164A-6
相關(guān)PDF資料
PDF描述
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
AM79C874 制造商:AMD 制造商全稱:Advanced Micro Devices 功能描述:NetPHY-1LP Low Power 10/100-TX/FX Ethernet Transceiver
AM79C874KC/W 制造商:未知廠家 制造商全稱:未知廠家 功能描述:LAN Transceiver
AM79C874VC 制造商:Advanced Micro Devices 功能描述:PHY 1-CH 10Mbps/100Mbps 80-Pin TQFP 制造商:AMD (Advanced Micro Devices) 功能描述:PHY 1-CH 10Mbps/100Mbps 80-Pin TQFP
AM79C874VD 制造商:Advanced Micro Devices 功能描述:PHY 1-CH 10Mbps/100Mbps 80-Pin TQFP 制造商:AMD (Advanced Micro Devices) 功能描述:PHY 1-CH 10Mbps/100Mbps 80-Pin TQFP
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