DM8603EP DAVICOM [Davicom Semiconductor, Inc.], DM8603EP Datasheet - Page 91
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DM8603EP
Manufacturer Part Number
DM8603EP
Description
10/100 Mbps 3-port Ethernet Switch Controller with MII / RMII Interface
Manufacturer
DAVICOM [Davicom Semiconductor, Inc.]
Datasheet
1.DM8603EP.pdf
(107 pages)
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9.4.2
data to synchronous 4-bit nibble data.
9.4.2.1
standards for both voltage thresholds and timing parameters.
9.4.2.2
becomes a concern. In high speed twisted pair signaling, the frequency content of the transmitted signal can
vary greatly during normal operation based on the randomness of the scrambled data stream.
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 depending on the installed
environment. The selection of long cable lengths for a given implementation requires significant
compensation, which will be over-killed in a situation that includes shorter, less attenuating cable lengths.
Conversely, the selection of short or intermediate cable lengths requiring less compensation will cause
serious under-compensation for longer length cables. Therefore, the compensation or equalization must be
adaptive to ensure proper conditioning of the received signal independent of the cable length.
9.4.2.3
9.4.2.4
Module locks onto the data stream and extracts the 125 MHz reference clock. The extracted and
synchronized clock and data are presented to the NRZI to NRZ decoder.
Preliminary datasheet
DM8603-12-DS-P01
November 8, 2010
The 100Base-TX receiver contains several function blocks that convert the scrambled 125Mb/s serial
The receive section contains the following functional blocks:
The signal detects function meets the specifications mandated by the ANSI XT12 TP-PMD 100Base-TX
When transmitting data over copper twisted pair cable at high speed, attenuation based on frequency
The DM8603 decodes the MLT-3 information from the Digital Adaptive Equalizer into NRZI data.
The Clock Recovery Module accepts NRZI data from the MLT-3 to NRZI decoder. The Clock Recovery
100Base-TX Receiver
Signal Detect
Digital Adaptive Equalization
MLT-3 to Binary Decoder
Clock Recovery Module
NRZI to NRZ Decoder
Serial to Parallel
Descrambler
Code Group Alignment
4B5B Decoder
Signal Detect
Adaptive Equalization
MLT-3 to NRZI Decoder
Clock Recovery Module
10/100 Mbps 3-port Ethernet Switch Controller with MII / RMII Interface
DM8603
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