參數(shù)資料
型號： RTL8208
廠商： Electronic Theatre Controls, Inc.
英文描述： REALTEK SINGLE CHIP OCTAL 10/100 MBPS FAST ETHERNET TRANSCEIVER
中文描述： 瑞昱單芯片八路10/100 Mbps快速以太網(wǎng)收發(fā)器
文件頁數(shù)： 23/40頁
文件大?。?/td> 546K
代理商： RTL8208
RTL8208
2001/01/07
23
Rev.1.923
7.4.4 Baseline Wander Compensation
The RTL8208 is ANSI TP-PMD compliant and supports input and Base Line Wander (BLW) compensation in 100Base-TX
mode. The RTL8208 does not require external attenuation circuitry at its receive inputs, RXIP/RXIN. It accepts TP-PMD
compliant waveforms directly, requiring only a 100
termination and a 1:1 transformer.
BLW is the change in the average DC content, over time, of an AC coupled digital transmission over a given transmission
medium. BLW is a result from the interaction between the low frequency components of a transmitted bit stream and the
frequency response of the AC coupling component(s) within the transmission system. If the low frequency content of the digital
bit stream goes below the low frequency pole of the AC coupling transformers, then the droop characteristics of the transformers
will dominate resulting in potentially serious BLW. If BLW is not compensated for, packet loss will occur.
7.5 100Base-FX
The RTL8208 can be configured into 100Base-FX mode through SEL_TXFX[1:0] (RPT_MODE should be 0). According to the
setting of SEL_TXFX[1:0], port 7 or port 6/7 or all eight ports can be configured to 100Base-FX operation.
Medium type
RPT_MODE=0
SEL_TXFX[1:0] Port 0 Port 1 Port2 Port3 Port4 Port5 Port6 Port7
2’b00
UTP
UTP
UTP
2’b01
UTP
UTP
UTP
2’b10
UTP
UTP
UTP
2’b11
FX
FX
FX
UTP: 10Base-T/100Base-TX,
FX: 100Base-FX.
UTP
UTP
UTP
FX
UTP
UTP
UTP
FX
UTP
UTP
UTP
FX
UTP
UTP
FX
FX
UTP
FX
FX
FX
Compared to common 100Base-FX applications, the RTL8208 lacks a pair of differential SD (signal detect) signals to achieve
its link monitoring function (patent), which significantly reduces the pin count in this octal PHY.
Any of the RTL8208 transceivers may interface with an external 100Base-FX fiber optic device and receiver instead of the
magnetics module used with twisted pair cable. The differential transmit and receive data pairs will operate at PECL voltage
levels instead of those required for twisted-pair transmission. The data will be encoded using two-level NRZI instead of
three-level MLT3. The data stream is not scrambled for fiber-optic transmission.
7.5.1 Transmit Function
In 100Base-FX transmission, TXD is processed as 100Base-TX, except without scrambling, before the NRZI stage. Instead of
converting to MLT-3 signals, as in 100Base-TX, the serial data stream is driven out as NRZI PECL signals, which enter the fiber
transceiver in differential-pairs form. The fiber transceiver should be available working in a 3.3V environment. Refer to the fiber
application section for more information.
PECL DC characteristics
Parameter
PECL Input High Voltage
PECL Input Low Voltage
PECL Output High Voltage
PECL Output Low Voltage
7.5.2 Receive Function
Symbol
Vih
Vil
Voh
Vol
Min
Vdd-1.16
Vdd-1.81
Vdd-1.02
Max
Vdd-0.88
Vdd-1.47
Vdd-1.62
Unit
V
V
V
V
Signals are received through PECL receiver inputs from the fiber transceiver, and directly passed to the clock recovery circuit for
data/clock recovery. The scrambler/descrambler is bypassed in 100Base-FX mode.
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