參數(shù)資料
型號: LXT970A
廠商: Intel Corp.
英文描述: Dual-Speed Fast Ethernet Transceiver
中文描述: 雙速度快速以太網(wǎng)收發(fā)器
文件頁數(shù): 45/74頁
文件大?。?/td> 1061K
代理商: LXT970A
Dual-Speed Fast Ethernet Transceiver
LXT970A
Datasheet
45
3.3.7
Typical Application
Figure 21 on page 46
is typical interface circuitry of the LXT970A. The diagram groups similar
pins; it does not portray the actual chip pinout. The Media Independent Interface (MII) pins are at
the upper left. Hardware Control Interface pins are center left. The line interface pins for twisted-
pair and fiber are shown on the top and bottom right respectively.
The VCCD and VCCIO pins are at the bottom of the diagram. VCCT, VCCR, and VCCA are at the
center right. All VCC pins (except VCCIO) use a single power supply. VCCIO may be powered by
a 3.3V supply, and may be separately connected.
3.3.7.1
Voltage Divider For MF Inputs
The LXT970A requires an external voltage divider to provide optional (V
MF
2 and V
MF
3) multi-
level inputs to the Multi-Function (MF) pins. These voltage levels are designated as V
MF
1 - V
MF
4.
A single voltage divider may be used to drive the MF pins in designs using multiple PHYs.
Figure
20
shows a voltage divider with three 1 k
resistors configured in series between VCC and
Ground.
Figure 20. Voltage Divider
V
MF
4
V
MF
3
V
MF
2
+5V
V
MF
1
1k
W
1k
W
1k
W
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