LAN9115 datasheet(32/114 Pages) MICROCHIP

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LAN9115

DS00002269A-page 32

 2005-2016 Microchip Technology Inc.

3.10.3

INTERNAL PHY POWER-DOWN MODES

There are 2 power-down modes for the internal Phy:

3.10.3.1

General Power-Down

This power-down is controlled by register 0, bit 11. In this mode the internal PHY, except the management interface, is

powered-down and stays in that condition as long as Phy register bit 0.11 is HIGH. When bit 0.11 is cleared, the PHY

powers up and is automatically reset. Please refer to Section 5.5.1, "Basic Control Register," on page 88 for additional

information on this register.

3.10.3.2

Energy Detect Power-Down

This power-down mode is activated by setting the Phy register bit 17.13 to 1. Please refer to Section 5.5.8, "Mode Con-

trol/Status," on page 92 for additional information on this register. In this mode when no energy is present on the line,

the PHY is powered down, with th exception of the management interface, the SQUELCH circuit and the ENERGYON

logic. The ENERGYON logic is used to detect the presence of valid energy from 100Base-TX, 10Base-T, or Auto-nego-

tiation signals

In this mode, when the ENERGYON signal is low, the PHY is powered-down, and nothing is transmitted. When energy

is received - link pulses or packets - the ENERGYON signal goes high, and the PHY powers-up. It automatically resets

itself into the state it had prior to power-down, and asserts the INT7.1 bit of the register defined in Section 5.5.11, "Inter-

rupt Source Flag," on page 93. If the ENERGYON interrupt is enabled, this event will cause an interrupt to the host. The

first and possibly the second packet to activate ENERGYON may be lost.

When 17.13 is low, energy detect power-down is disabled.

3.11

Detailed Reset Description

The LAN9115 has five reset sources:

• Power-On Reset (POR)

• Hardware Reset Input Pin (nRESET)

FIGURE 3-11:

PME AND PME_INT SIGNAL GENERATION

PME

ED_EN

WOL_EN

50ms

PME_EN

PME_IND

PME_POL

PME_TYPE

LOGIC

WUEN

MPEN

phy_int

WUPS

WUFR

MPR

Denotes a level-triggered "sticky" status bit

PME_INT_EN

PME_INT

IRQ_EN

IRQ

Other System

Interrupts

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