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82540EP — Networking Silicon
3.5
P H Y S i g n a l s
3.5.1
Crystal Signals
Symbol
XTAL1
XTAL2
3.5.2
Analog Signals
Symbol
REF
MDI[0]+/-
MDI[1]+/-
MDI[2]+/-
MDI[3]+/-
14
Type
Crystal One. The Crystal One pin is a 25 MHz +/- 50 ppm input signal. It can be
I
connected to either an oscillator or crystal. If a crystal is used, 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.
Type
Reference. This Reference signal should be connected to VSS through an external
P
2.49 K resistor.
Media Dependent Interface [0].
: In MDI configuration, MDI[0]+/- corresponds to BI_DA+/-, and in MDI-X
1000BASE-T
configuration, MDI[0]+/- corresponds to BI_DB+/-.
A
: In MDI configuration, MDI[0]+/- is used for the transmit pair, and in MDI-X
100BASE-TX
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].
: In MDI configuration, MDI[1]+/- corresponds to BI_DB+/-, and in MDI-X
1000BASE-T
configuration, MDI[1]+/- corresponds to BI_DA+/-.
A
: In MDI configuration, MDI[1]+/- is used for the receive pair, and in MDI-X
100BASE-TX
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].
: In MDI configuration, MDI[2]+/- corresponds to BI_DC+/-, and in MDI-X
1000BASE-T
configuration, MDI[2]+/- corresponds to BI_DD+/-.
A
: Unused.
100BASE-TX
10BASE-T : Unused.
Media Dependent Interface [3].
: In MDI configuration, MDI[3]+/- corresponds to BI_DD+/-, and in MDI-X
1000BASE-T
configuration, MDI[3]+/- corresponds to BI_DC+/-.
A
: Unused.
100BASE-TX
10BASE-T : Unused.
Name and Function
Name and Function
Datasheet
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