LAN9500AI datasheet(107/213 Pages) MICROCHIP

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DS00001875A-page 107

LAN950x

5.12.2.2

Enabling WOL Wake Events

The Host system must perform the following steps to enable the device to assert a remote_wake event on detection of

a Wake on LAN event.

All transmit and receive operations must be halted:

All pending Ethernet TX and RX operations must be completed.

The MAC must be halted.

The MAC must be configured to detect the desired wake event. This process is explained in Section 5.5.5,

"Wakeup Frame Detection," on page 59 for Wakeup Frames and in Section 5.5.6, "Magic Packet Detection," on

page 63 for Magic Packets.

(LAN9500A/LAN9500Ai ONLY):

Configuring Perfect DA and Broadcast Frame wakeup detection is analogous and requires the Perfect DA

Wakeup Enable (PFDA_EN) or Broadcast Wakeup Enable (BCAST_EN) bit to be set in the Wakeup Control and

Status Register (WUCSR).

Bit 1 of the Wakeup Status (WUPS[1]) in the Power Management Control Register (PMT_CTL) must be cleared

since a set bit will cause the immediate assertion of wake event when the Wake-On-Lan Enable (WOL_EN) bit

is set. The WUPS[1] bit will not clear if the internal MAC wakeup event is asserted.

Set the Wake-On-Lan Enable (WOL_EN) bit in the Power Management Control Register (PMT_CTL).

The Host places the device in the SUSPEND0 state by setting the Suspend Mode (SUSPEND_MODE) field in

the Power Management Control Register (PMT_CTL) to 00b, to indicate the desired suspend state, then sends

suspend signaling.

On detection of an enabled event, the device will transition back to the NORMAL state and signal a remote_wake event.

The software will then examine the Suspend Mode (SUSPEND_MODE) field of the Power Management Control Reg-

ister (PMT_CTL). Upon discovering wakeup occurred from SUSPEND0 state, the status bits of the WUCSR register

may be examined to determine the particular event that caused the wakeup.

5.12.2.3

Enabling Link Status Change (Energy Detect) Wake Events

The Host system must perform the following steps to enable the device to assert a remote_wake event on detection of

an Ethernet link status change.

All transmit and receive operations must be halted:

All pending Ethernet TX and RX operations must be completed.

The MAC must be halted.

The PHY must be enabled for the energy detect power down mode This is done by clearing the EDPWRDOWN

bit in the PHY’s Mode Control/Status Register. Enabling the energy detect power-down mode places the PHY in

a reduced power state. In this mode of operation the PHY is not capable of receiving or transmitting Ethernet

data. In this state, the PHY will assert its internal interrupt if it detects Ethernet activity. Refer to Section 5.6.8.2,

"Energy Detect Power-Down (EDPD)," on page 78 for more information.

Bit 0 of the Wakeup Status (WUPS[0]) in the Power Management Control Register (PMT_CTL) must be cleared,

since a set bit will cause the immediate assertion of wake event when Energy-Detect Enable (ED_EN) is set. The

WUPS[0] bit will not clear if the internal PHY interrupt is asserted.

Set the Energy-Detect Enable (ED_EN) bit in the Power Management Control Register (PMT_CTL).

The Host places the device in the SUSPEND1 state by setting the Suspend Mode (SUSPEND_MODE) field in

the Power Management Control Register (PMT_CTL) to 01b, to indicate the desired suspend state, then sends

suspend signaling.

On detection of Ethernet activity (energy), the device will transition back to the NORMAL state and signal a

remote_wake event.

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