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參數資料
| 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（高度集成的以太網雙絞線和光纖數據收發(fā)器）) |
| 中文描述： | 四100BaseTX/100BaseFX/10BaseT物理層裝置（高度集成的以太網收發(fā)器，雙絞線和光纖以太網的應用）（四通道100BaseTX/100BaseFX/10BaseT物理層處理器（高度集成的以太網雙絞線和光纖數據收發(fā)器） ） |
| 文件頁數： | 53/92頁 |
| 文件大小： | 1401K |
| 代理商： | 84220 |
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MD400177/B
84220
53
4.6.2 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 84220 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 84220 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
4.6.3 Operation with 5V Fiber Transceivers
It is also possible to use the 84220 with 5V fiber modules
by changing the resistive termination network slightly.
Since the 84220 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.
The termination network on the FXIP/FXIN inputs of the
84220 must be modified for operation with 5V modules by
adding a third resistor as a “tap” on the pulldown leg, as
shown in Figure 15. This divides down the voltage seen at
the input of the 84220 so that it does not exceed the
range of the input buffer. The pullup resistor
recommended by the 5V module supplier will generally
remain the same - usually about 82.5 Ohms to the 5V
supply. The normally recommended 125 Ohm pulldown
resistor must be split into two. The values of this new pair
should be 52.3 Ohms connected to the pullup resistor and
73.2 Ohms connected from the 52.3 Ohm resistor to
ground, providing a voltage divider function at the junction
of the pair. The junction of these two resistors should be
connected to the FXIP/FXIN and SD_[3:0]/FXEN_[3:0]
inputs of the 84220. This will provide a High PECL logic
level of 2.36V and a low of 1.92V which is sufficient for
operation of the 84220. An interface suitable for
operation wit 5V fiber transceiver modues is shown below
in Figure 15.
The fiber interface transmit (output) level can also be
adjusted with the two output level bits in the MI serial port
Channel Configuration register as shown in Table 4. The
adjustment range is -15% to +30% in 15% steps.
Table 15. FX Interface to 5V Fiber Modules
4.7 MII CONTROLLER INTERFACE
4.7.1 General
The MII controller interface allows the 84220 to connect to
any external Ethernet controller without any glue logic,
provided that the external Ethernet controller has an MII
interface that complies with IEEE 802.3 as shown in
Figure 12 and Figure 13.
The 84220 also offers RMII (Reduced MII) interface as a
selectable option for use with controllers (MACs)
supporting RMII operation. By holding the RMII_EN pin
high, the RMII interface is enabled, cutting the required
interface signals from 16 to 6. This is a significant savings
in board interconnect for high port count systems.
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
3.3V
Transceiver
VDD = 3.3V
FXOP
FXON
FXIP
FXIN
SD/FXEN
SD_THR
T5V Fiber
RD
RD-
VDD = 5V
TD
TD-
SD
82.5
15K
10K
73.2
61.9
261
VDD = 5V
52.3
82.5
52.3
73.2
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