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參數(shù)資料
| 型號： | 84225 |
| 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(yīng)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)： | 52/86頁 |
| 文件大?。?/td> | 1297K |
| 代理商： | 84225 |
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52
MD400183/A
84225
4.4 TRANSMITTER DROOP
The IEEE 802.3 specification has a transmitter output
droop requirement for 100BaseTX. Since the 84225 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 84225 outputs meets the requirements
in Table 20, the transmit interface to the TP cable will meet
the IEEE 802.3 droop requirements.
4.5 FIBER INTERFACE
4.5.1 General
The 84225 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
84225 are shown in Table 22. The Siemens Fiber
Transceiver V23809-C8-C10 operates at 3.3V for use with
the SEEQ 84225. 5V Fiber modules such as the HP
HFBR-5103 will also operate with the proper termination
network described later.
Table 22. 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 84225 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 84225, 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.
4.5.2 Operation with 3.3V Fiber Transceivers
Termination on the differential outputs of the fiber
transceiver module must be observed for proper
impedance matching, which is normally the equivalent of
50 Ohms single ended. The terminating resistor values
are shown in Figure 14 for FXOP/FXON (outputs), FXIP/
FXIN (inputs) and SD_[3:0]/FXEN_[3:0] (inputs) for use
with 3.3V fiber modules. The calculated termination
resistors on FXOP/FXON are a pullup of 69.8 Ohms to
3.3V and a pulldown of 174 Ohms to ground.
The termination network at the fiber inputs (FXIP/FXIN
and SD_[3:0]/FXEN_[3:0]) of the 84225 is specified by
the fiber module manufacturer and will normally be a
pullup of 127 Ohms to 3.3V and a pulldown of 82.5 Ohms
to GND, as shown in Figure 14. Note that the Input and
Output termination resistor values are different since the
output driver of the Fiber module and the 84225 have a
different structure. The interface network for 3.3V fiber
transceiver modules is shown in Figure 14.
Figure 14. FX Interface to 3.3V Fiber Modules
4.5.3 Operation with 5V Fiber Transceivers
It is also possible to use the 84225 with 5V fiber modules
by changing the resistive termination network slightly.
Since the 84225 FXOP/FXON Outputs are 5V tolerant,
the output termination resistors should be a pullup of 61.9
Ohms to the 5V supply, and a pulldown of 261 Ohms to
GND, as shown in Figure 15. This provides an Ouput High
Voltage of 4.05V and a low of about 3.3V to the fiber
module.
3.3V
SEEQ 84220
10/100 TX/FX
Transceiver
VDD = 3.3V
FXOP
FXON
FXIP
FXIN
SD/FXEN
SD_THR
3.3V Fiber
Transceiver
RD
RD-
VDD = 3.3V
TD
TD-
SD
127
69.8
127
82.5
82.5
174
3.3V
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