GD82541PI datasheet(16/46 Pages) INTEL

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82541(PI/GI/EI) — Networking Silicon

3.4.2

Other Signals (4)

3.5

PHY Signals

3.5.1

Crystal Signals (2)

Note:

The 82541 clock input circuit is optimized for use with an external crystal. However, an oscillator

may also be used in place of the crystal with the proper design considerations. The 82540EP/

82541(PI/GI/EI) & 825462EZ(EX) Dual Footprint Design Guide (AP-444) should be consulted for

further details.

3.5.2

Analog Signals (10)

Symbol

Type

Name and Function

SDP[3:0]

Software Defined Pin. The Software Defined Pins are reserved and programmable

with respect to input and output capability. These default to input signals upon power-

up but may be configured differently by the EEPROM. The upper two bits may be

mapped to the General Purpose Interrupt bits if they are configured as input signals.

Symbol

Type

Name and Function

XTAL1

Crystal One. The Crystal One pin is a 25 MHz +/- 30 ppm input signal. It should be

connected to a crystal, and the other end of the crystal should be connected to XTAL2.

XTAL2

Crystal Two. Crystal Two is the output of an internal oscillator circuit used to drive a

crystal into oscillation.

Symbol

Type

Name and Function

MDI[0]+/-

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+/-.

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.

MDI[1]+/-

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+/-.

100BASE_TX: 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.

MDI[2]+/-

Media Dependent Interface [2].

1000BASE-T: In MDI configuration, MDI[2]+/- corresponds to BI_DC+/-, and in MDI-X

configuration, MDI[2]+/- corresponds to BI_DD+/-.

100BASE_TX: Unused.

10BASE-T: Unused.

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