adm6999ux Infineon Technologies Corporation, adm6999ux Datasheet - Page 18

• Manufacturer Part Number: adm6999ux
• Description: Adm6999u 9 Port 10/100 Mb/s Single Chip Ethernet Switch Controller
• Manufacturer: Infineon Technologies Corporation

•
Figure 3
3.2.2.1
High performance A/D converter with 125 MHz sampling rate converts signals received on RXP/RXN pins to 6 bits
data streams; besides it possess auto-gain-control capability that will further improve receiving performance
especially under long cable or harsh detrimental signal integrity. Due to high pass characteristic on transformer,
built in base-line-wander correcting circuit will cancel it out and restore its DC level.
3.2.2.2
All digital design is especial immune from noise environments and achieves better correlation between production
and system testing. Baud rate Adaptive Equalizer/Timing Recovery compensates line loss induced from twisted
pair and tracks far end clock at 125M samples per second. Adaptive Equalizer implemented with Feed forward
and Decision Feedback techniques meet the requirement of BER less than 10-12 for transmission on CAT5
twisted pair cable ranging from 0 to 120 meters.
3.2.2.3
The recovered data is converted from NRZI to NRZ. The data is not necessarily aligned to 4B/5B code group’s
boundary.
Data Sheet
Stream decoder block
RXD[1:0]
TXD[1:0]
CRSDV
TXEN
100Base-X Module
A/D Converter
Adaptive Equalizer and Timing Recovery Module
NRZI/NRZ and Serial/Parallel Decoder
RXD[3:0]
BP_ALIGN
BP_4B5B
TXCLK
RXDV
RXER
TXEN
TXER
CRS
COL
TXD[3:0]
BP_4B5B
DECODER
RX STATE
MACHINE
TX STATE
MACHINE
BP_SCR
4B/5B
18
BP_ALIGN
BP_DSCR
100BASE-X RECEIVER
MACHINE
100BASE-X TRANSMITTER
MLT-3
STATE
Rev. 1.42, 2005-11-25
ADM6999U/UX
DRIVER
DRIVER
10/100
FIBER
OPTIC
TX
Data Sheet
Descriptions
SDP
FOTX+
FOTX-
RXN
RXP
TXN
TXP