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參數(shù)資料
| 型號(hào)： | LXT974QC |
| 英文描述： | LAN Transceiver |
| 中文描述： | 網(wǎng)絡(luò)收發(fā)器 |
| 文件頁(yè)數(shù)： | 48/68頁(yè) |
| 文件大?。?/td> | 1177K |
| 代理商： | LXT974QC |
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LXT9784
—
Low-Power Octal PHY
48
Datasheet
3.0
Application Information
3.1
Magnetics
Table 23
lists of magnetics modules available from various vendors. All modules listed support
both 10M and 100M operation.
3.2
Analog References (RBIAS)
The four RBIAS inputs (RBIAS10_0, RBIAS10_1, and RBIAS100_0, RBIAS100_1) must have
external resistor connections. The inputs are sensitive to the resistor value and some
experimentation is required to select the correct values for any given layout. Resistors of 1%
tolerance are to be used. See
Figure 12
for a circuit example.
3.3
RMII Applications
The RMII ports provide eight low pin-count interfaces between the eight PHYs and an ASIC
switch, as an alternative to the SMII interface. The RMII interface is composed of seven signals per
port, and a global reference clock.
Table 23. Magnetics Module Vendor
Vendor
Model/Type
Bel Fuse
0558-5999-N7 (quad)
Pulse Engineering
H1141T (single)
H1140T (quad)
Figure 12. Typical RBIAS Circuit
464 1%
LXT9784
RBIAS100_1
RBIAS10_1
RBIAS100_0
RBIAS10_0
619 1%
464 1%
619 1%
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