LAN8740AI-EN datasheet(71/136 Pages) MICROCHIP

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DS00001987A-page 71

LAN8740A/LAN8740Ai

4.2.12

EDPD NLP/CROSSOVER TIME/EEE CONFIGURATION REGISTER

Index (In Decimal):

Size:

16 bits

Bits

Description

Type

Default

EDPD TX NLP Enable

When in Energy Detect Power-Down (EDPD) mode (EDPWRDOWN =1), this

bit enables the transmission of single TX NLPs at the interval defined by the

EDPD TX NLP Interval Timer Select field.

0 = TX NLP disabled

1 = TX NLP enabled when in EDPD mode

R/W

NASR

14:13

EDPD TX NLP Interval Timer Select

When in Energy Detect Power-Down (EDPD) mode (EDPWRDOWN = 1) and

EDPD TX NLP Enable is 1, this field defines the interval used to send single

TX NLPs.

00 = 1 second (default)

01 = 768 ms

10 = 512 ms

11 = 256 ms

R/W

NASR

00b

EDPD RX Single NLP Wake Enable

When in Energy Detect Power-Down (EDPD) mode (EDPWRDOWN =1), this

bit enables waking the PHY on reception of a single RX NLP.

0 = RX NLP wake disabled

1 = TX NLP wake enabled when in EDPD mode

R/W

NASR

11:10

EDPD RX NLP Max Interval Detect Select

When in Energy Detect Power-Down (EDPD) mode (EDPWRDOWN = 1) and

EDPD RX Single NLP Wake Enable is 0, this field defines the maximum inter-

val for detecting two RX NLPs to wake from EDPD mode

00 = 64 ms (default)

01 = 256 ms

10 = 512 ms

11 = 1 second

R/W

NASR

00b

9:3

RESERVED

PHY Energy Efficient Ethernet Enable (PHYEEEEN)

When set, enables Energy Efficient Ethernet (EEE) operation in the PHY.

When cleared, EEE operation is disabled.

Refer to Section 3.8.5, "Energy Efficient Ethernet" for additional information.

R/W

NASR

EDPD Extend Crossover

When in Energy Detect Power-Down (EDPD) mode (EDPWRDOWN =1),

setting this bit to 1 extends the crossover time by 2976 ms.

0 = Crossover time extension disabled

1 = Crossover time extension enabled (2976 ms)

R/W

NASR

Extend Manual 10/100 Auto-MDIX Crossover Time

When Auto-MIDX is enabled and the PHY is in manual 10BASE-T or

100BASE-TX mode, setting this bit to 1 extends the crossover time by 1984

ms to allow linking to an auto-negotiation link partner PHY.

0 = Crossover time extension disabled

1 = Crossover time extension enabled (1984 ms)

R/W

NASR

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