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參數(shù)資料
| 型號： | 84C24 |
| 英文描述： | 84C24 Quad 10BASE-T Ethernet Media Interface Adapter manual 6/96 |
| 中文描述： | 84C24四10BASE - T以太網(wǎng)媒體接口適配器手冊6 / 96 |
| 文件頁數(shù)： | 8/51頁 |
| 文件大?。?/td> | 435K |
| 代理商： | 84C24 |
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84C24
4-8
MD400147/A
0
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–1.0
–0.8
–0.6
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TIME (ns)
V
Figure 2. TP Differential Output Voltage Template
3.6.4 STP (150 Ohm) Cable Mode
The transmitter can be configured to drive 150 ohm
shielded twisted pair (STP) cable. When STP mode is
enabled, the output current s reduced by the ratio of 100/
150 in order to keep the amplitude of the transmit signal
unchanged from the specified transmit levels and tem-
plate. The STP mode can be selected through the cable
type select bit in the serial port Global Configuration
register.
3.7 TWISTED PAIR RECEIVER
3.7.1 Receiver
The TP receiver is able to detect input signals from the
twisted pair cable that are within the template shown in
Figure 3.
The TPI
±
inputs are internally biased to V
/3 by internal
bias resistors. The TPI
±
inputs pass through a low pass
filter designed to eliminate high frequency noise on the
input.
The receive filter output then goes to two different types of
receive comparators, threshold and zero crossing. The
threshold comparator determines whether the signal is
valid, and the zero crossing comparator is used to sense
the actual data transitions once the signal s determined to
be valid data. The output of the threshold comparator is
used for squelch, link pulse detect, SOI detect, reverse
polarity detect, and Full Duplex detect. The output of the
zero crossing comparator is used for data recovery.
3.7.2 Squelch
The threshold comparator compares the TPI
±
inputs
against fixed positive and negative thresholds, called
squelch levels. If the input voltage to the threshold
comparator exceeds the squelch levels for three bit times
with alternating polarity within a 100-250 ns interval, the
data is considered to be valid and the receiver now enters
into the unsquelch state. In the unsquelch state, the
receive threshold level is reduced by approximately 30%
for noise immunity reasons and is called the unsquelch
level. While in the unsquelch state, the receive squelch
circuit looks for SOI (Start Of Idle) pulse at the end of a
packet. When the SOI signal is detected, the receive
squelch is turned on again. The receiver meets the
squelch requirements defined in IEEE 802.3 Section 14.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| 84C24 | Quad 10Base-T Ethernet Media Interface Adapter(四通道10Base-T以太網(wǎng)媒體接口適配器) |
| 84C300A | 84C300A 4-Port Fast Ethernet Controller manual 3/98 |
| 84C30A | 84C30A 10 Mbps Controller (MAC) manual 12/96 |
| 84C300A | 4-Port Fast Ethernet Controller(四端口快速以太網(wǎng)控制器) |
| 84CNQ035 | Schottky Rectifier |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 84C2A-A12-J06 | 制造商:BOURNS 制造商全稱:Bourns Electronic Solutions 功能描述:83/84 - 5/8 Square 10-Turn |
| 84C2A-A12-J06L | 制造商:BOURNS 制造商全稱:Bourns Electronic Solutions 功能描述:83/84 - 5/8 Square 10-Turn |
| 84C2A-A12-J08L | 制造商:BOURNS 制造商全稱:Bourns Electronic Solutions 功能描述:83/84 - 5/8 Square 10-Turn |
| 84C2A-A12-J10L | 制造商:BOURNS 制造商全稱:Bourns Electronic Solutions 功能描述:83/84 - 5/8 Square 10-Turn |
| 84C2A-A12-K06 | 制造商:BOURNS 制造商全稱:Bourns Electronic Solutions 功能描述:83/84 - 5/8 Square 10-Turn |
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