DM8603EP DAVICOM [Davicom Semiconductor, Inc.], DM8603EP Datasheet - Page 92

• Manufacturer Part Number: DM8603EP
• Description: 10/100 Mbps 3-port Ethernet Switch Controller with MII / RMII Interface
• Manufacturer: DAVICOM [Davicom Semiconductor, Inc.]

9.4.2.5
100Base-TX transmission over Category-5 unshielded twisted pair cable. This conversion process must be
reversed on the receive end. The NRZI to NRZ decoder receives the NRZI data stream from the Clock
Recovery Module and converts it to a NRZ data stream to be presented to the Serial to Parallel conversion
block.
9.4.2.6
converts the data stream to parallel data to be presented to the descrambler.
9.4.2.7
the receiver must descramble the receive data streams. The descrambler receives scrambled parallel data
streams from the Serial to Parallel converter, and it descrambles the data streams, and presents the data
streams to the Code Group alignment block.
9.4.2.8
5B code group data. Code Group Alignment occurs after the J/K is detected and subsequent data is aligned
on a fixed boundary.
9.4.2.9
data. When receiving a frame, the first 2 5-bit code groups receive the start-of-frame delimiter (J/K symbols).
The J/K symbol pair is stripped and two nibbles of preamble pattern are substituted. The last two code
groups are the end-of-frame delimiter (T/R Symbols).
Preliminary datasheet
DM8603-12-DS-P01
November 8, 2010
The transmit data stream is required to be NRZI encoded for compatibility with the TP-PMD standard for
The Serial to Parallel Converter receives a serial data stream from the NRZI to NRZ converter. It
Because of the scrambling process requires to control the radiated emissions of transmit data streams,
The Code Group Alignment block receives un-aligned 5B data from the descrambler and converts it into
The 4B5B Decoder functions as a look-up table that translates incoming 5B code groups into 4B (Nibble)
The T/R symbol pair is also stripped from the nibble, presented to the Reconciliation layer.
NRZI to NRZ
Serial to Parallel
Descrambler
Code Group Alignment
4B5B Decoder
10/100 Mbps 3-port Ethernet Switch Controller with MII / RMII Interface
DM8603
92