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DP83848H 数据表(PDF) 42 Page - Texas Instruments

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部件名 DP83848H
功能描述  MII Serial Management Interface
Download  84 Pages
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制造商  TI1 [Texas Instruments]
网页  http://www.ti.com
标志 TI1 - Texas Instruments

DP83848H 数据表(HTML) 42 Page - Texas Instruments

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DP83848H, DP83848J, DP83848K, DP83848M, DP83848T
SNLS250E – MAY 2008 – REVISED APRIL 2015
www.ti.com
6.5.1.2.3 Digital Adaptive Equalization and Gain Control
When transmitting data at high speeds over copper twisted pair cable, frequency dependent attenuation
becomes a concern. In high-speed twisted pair signaling, the frequency content of the transmitted signal
can vary greatly during normal operation based primarily on the randomness of the scrambled data
stream. This variation in signal attenuation caused by frequency variations must be compensated to
ensure the integrity of the transmission.
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 depending on the installed environment. The selection of
long cable lengths for a given implementation, requires significant compensation which will over-
compensate for shorter, less attenuating lengths. Conversely, the selection of short or intermediate cable
lengths requiring less compensation will cause serious under-compensation for longer length cables. The
compensation or equalization must be adaptive to ensure proper conditioning of the received signal
independent of the cable length.
The DP83848x uses an extremely robust equalization scheme referred as ‘Digital Adaptive Equalization.’
The Digital Equalizer removes ISI (inter-symbol interference) from the receive data stream by continuously
adapting to provide a filter with the inverse frequency response of the channel. Equalization is combined
with an adaptive gain control stage. This enables the receive 'eye pattern' to be opened sufficiently to
allow very reliable data recovery.
The curves given in Figure 6-7 illustrate attenuation at certain frequencies for given cable lengths. This is
derived from the worst case frequency vs attenuation figures as specified in the EIA/TIA Bulletin TSB-36.
These curves indicate the significant variations in signal attenuation that must be compensated for by the
receive adaptive equalization circuit.
Figure 6-7. EIA/TIA Attenuation vs Frequency for 0, 50, 100, 130 and 150 Meters of CAT 5 Cable
6.5.1.2.4 Base Line Wander Compensation
The DP83848x is completely ANSI TP-PMD compliant and includes Base Line Wander (BLW)
compensation. The BLW compensation block can successfully recover the TP-PMD defined “killer”
pattern.
BLW can generally be defined as the change in the average DC content, relatively short period over time,
of an AC coupled digital transmission over a given transmission medium (that is, copper wire).
42
Detailed Description
Copyright © 2008–2015, Texas Instruments Incorporated
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Product Folder Links: DP83848H DP83848J DP83848K DP83848M DP83848T


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