82545GM Просмотр технического описания (PDF) - Intel
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82545GM Datasheet PDF : 55 Pages
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Networking Silicon — 82545GM
3.6
3.6.1
3.6.2
PHY Signals
Crystal Signals
Symbol
XTAL1
XTAL2
Type
Name and Function
I
Crystal One. The Crystal One pin is a 25 MHz +/- 30 ppm input signal. It can be
connected to a 25 MHz crystal. Crystal Two (XTAL2) must also be connected.
Crystal Two. Crystal Two is the output of an internal oscillator circuit used to drive a
O
crystal into oscillation. If an external oscillator is used in the design, XTAL2 must be
disconnected.
Analog Signals
Symbol
REF
MDI[0]+/-
MDI[1]+/-
MDI[2]+/-
MDI[3]+/-
Type
Name and Function
P
Reference. This Reference signal should be connected to VSS through an external
2.49 K resistor.
Media Dependent Interface [0].
1000BASE-T: In MDI configuration, MDI[0]+/- corresponds to BI_DA+/-, and in MDI-X
configuration, MDI[0]+/- corresponds to BI_DB+/-.
A
100BASE-TX: In MDI configuration, MDI[0]+/- is used for the transmit pair, and in MDI-X
configuration, MDI[0]+/- is used for the receive pair.
10BASE-T: In MDI configuration, MDI[0]+/- is used for the transmit pair, and in MDI-X
configuration, MDI[0]+/- is used for the receive pair.
Media Dependent Interface [1].
1000BASE-T: In MDI configuration, MDI[1]+/- corresponds to BI_DB+/-, and in MDI-X
configuration, MDI[1]+/- corresponds to BI_DA+/-.
A
100BASE-T: In MDI configuration, MDI[1]+/- is used for the receive pair, and in MDI-X
configuration, MDI[1]+/- is used for the transit pair.
10BASE-T: In MDI configuration, MDI[1]+/- is used for the receive pair, and in MDI-X
configuration, MDI[1]+/- is used for the transit pair.
Media Dependent Interface [2].
1000BASE-T: In MDI configuration, MDI[2]+/- corresponds to BI_DC+/-, and in MDI-X
A
configuration, MDI[2]+/- corresponds to BI_DD+/-.
100BASE-TX: Unused.
10BASE-T: Unused.
Media Dependent Interface [3].
1000BASE-T: In MDI configuration, MDI[3]+/- corresponds to BI_DD+/-, and in MDI-X
A
configuration, MDI[3]+/- corresponds to BI_DC+/-.
100BASE-TX: Unused.
10BASE-T: Unused.
Datasheet
15
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