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參數(shù)資料
| 型號： | 84220 |
| 廠商： | LSI Corporation |
| 英文描述： | Quad 100BaseTX/100BaseFX/10BaseT Physical Layer Device （Highly Integrated Ethernet Transceiver For Twisted Pair And Fiber Ethernet Applications）(四通道100BaseTX/100BaseFX/10BaseT 物理層處理器（高度集成的以太網(wǎng)雙絞線和光纖數(shù)據(jù)收發(fā)器）) |
| 中文描述： | 四100BaseTX/100BaseFX/10BaseT物理層裝置（高度集成的以太網(wǎng)收發(fā)器，雙絞線和光纖以太網(wǎng)的應用）（四通道100BaseTX/100BaseFX/10BaseT物理層處理器（高度集成的以太網(wǎng)雙絞線和光纖數(shù)據(jù)收發(fā)器） ） |
| 文件頁數(shù)： | 52/92頁 |
| 文件大?。?/td> | 1401K |
| 代理商： | 84220 |
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52
MD400177/B
84220
described in Table 2. For example, if the output loading is
30 pF the value of the output level needs to be adjusted
by approximately +10% to meet the IEEE levels.
4.4 CABLE SELECTION
The 84220 can drive two different TP cable types:
100 ohm unshielded twisted pair, Category 5
150 ohm shielded twisted pair.
The 84220 must be properly configured for the type of
cable in order to meet the return loss specifications in
IEEE 802.3. This configuration requires setting a bit in
the serial port and selecting the value of some external
resistors, as described inTable 25. The cable type select
bit in Table 25, is a bit in the MI serial port Channel
configuration register and sets the output current level for
the cable type. R
TERM
in Table 25 is the sum of the two
external termination resistors connected between VDD to
TPOP/N and VDD to TPIP/N, as shown in Figure 12.
These resistors should be 1% tolerance. Also note that
some output level adjustment may be necssary due
to parasitics as described in the TP TRANSMIT OUTPUT
CURRENT SET Section.
Table 25. Cable Configuration
4.5 TRANSMITTER DROOP
The IEEE 802.3 specification has a transmitter output
droop requirement for 100BaseTX. Since the 84220 TP
output is a current source, it has no perceptible droop by
itself. However, the open circuit inductance of the
transformer added to the device transmitter output as
shown in Figure 12 will cause droop to appear at the
transmit interface to the TP wire. If the transformer
connected to the 84220 outputs meets the requirements
in Table 27, the transmit interface to the TP cable will meet
the IEEE 802.3 droop requirements.
4.6 FIBER INTERFACE
4.6.1 General
The 84220 uses a PECL-type driver/receiver to achieve a
thoughput of 100 Mbps across a differential fiber
interface. The interface comprises four signals: FXOP/
FXON (output) and FXIP/FXIN (input).
Some Fiber transceivers modules that will work with the
84220 are shown in Table 26. The Siemens Fiber
Transceiver V23809-C8-C10 operates at 3.3V for use with
the SEEQ 84220. 5V Fiber modules such as the HP
HFBR-5103 will also operate with the proper termination
network described later.
Table 26. Fiber Transceiver Modules
Vendor
3.3V
5V
Siemens
[1]
V23809-C8-C10
V23809-C8-C10
HP
Available
Soon
HFBR-5103
Amp
Contact Supplier
269040-1
Note 1. Siemen’s part operates at both 3.3V and 5V
supply values.
The 84220 fiber interface is enabled for each channel
independently if a valid PECL Fiber signal is tied to the
SD_[3:0]/FXEN_[3:0] pins; the fiber interface is disabled
(and the TP interface enabled) by connecting the
SD_[3:0]/FXEN_[3:0] pins to GND for that channel.
AutoNegotiation and the scrambler/descrambler are
disabled when the fiber interface is enabled.
The voltage applied to the SD_THR pin sets the input
reference level of the fiber interface for the single ended
Signal Detect inputs only. If a 3.3 V fiber transceiver is
used with the 84220, this pin should be tied to GND. If a
5 V fiber transceiver is used, this pin needs to be tied to
VCC(3.3V)-1.3 V (about 2V), but referenced to the 5V
supply of the fiber transceiver. An easy way to do this is
with a 15K:10K voltage divider from the 5 V supply to
ground, with the center point of the divider connected to
SD_THR, as shown in Figure 15.
Cable Type
Cable Type
Select Bit
(17.11)
R
TERM
(ohms)
TPOP/N TPIP/N
50
100 Ohm UTP, Cat. 5
UTP
100
150 Ohm STP
STP
75
150
相關PDF資料 |
PDF描述 |
|---|---|
| 84221 | 84221 Quad 10/100 Mbps TX/FX/10BT (PHY) manual 1/99 |
| 84221 | Quad 100BaseTX/100BaseFX/10BaseT Physical Layer Device （Highly Integrated Ethernet Transceiver For Twisted Pair And Fiber Ethernet Applications）(四通道100BaseTX/100BaseFX/10BaseT 物理層處理器（高度集成的以太網(wǎng)雙絞線和光纖數(shù)據(jù)收發(fā)器）) |
| 84301 | 84301 4-Port Fast Ethernet Controller manual 3/98 |
| 84301 | 4-Port Fast Ethernet Controller( 4端口快速以太網(wǎng)控制器) |
| 84717000 | MINIATURNAEHERUNGSSCHALTER 4MM GLATT PNP |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| 8422002AGI | 制造商:Integrated Device Technology Inc 功能描述:8422002AGI - Rail/Tube |
| 8422002AGI-01 | 制造商:Integrated Device Technology Inc 功能描述:8422002AGI-01 - Rail/Tube |
| 8422002AGI-01LF | 制造商:IDT 制造商全稱:Integrated Device Technology 功能描述:FEMTOCLOCKS⑩ CRYSTAL-TOLVHSTL FREQUENCY SYNTHESIZER |
| 8422002AGI-01LFT | 制造商:IDT 制造商全稱:Integrated Device Technology 功能描述:FEMTOCLOCKS⑩ CRYSTAL-TOLVHSTL FREQUENCY SYNTHESIZER |
| 8422002AGI-01T | 制造商:Integrated Device Technology Inc 功能描述:8422002AGI-01T - Tape and Reel |
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