LAN9116 datasheet(30/109 Pages) MICROCHIP

30 / 109 page

LAN9116

DS00002268A-page 30

 2005-2016 Microchip Technology Inc.

The external PME signal can be setup for pulsed, or static operation. When the PME_IND bit in the PMT_CTRL register

is set to a ‘1’, the external PME signal will be driven active for 50ms upon detection of a wake-up event. When the

PME_IND bit is cleared, the PME signal will be driven continuously upon detection of a wake-up event. The PME signal

is deactivated by clearing the WUPS bits, or by clearing the corresponding WOL_EN or ED_EN bit. The PME signal can

also be deactivated by clearing the PME_EN bit.

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 83 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 87 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 88. 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.

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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