LAN9220 datasheet(80/142 Pages) MICROCHIP

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LAN9220

DS00002417A-page 80

 2006-2017 Microchip Technology Inc.

5.3.13

PMT_CTRL— POWER MANAGEMENT CONTROL REGISTER

This register controls the Power Management features. This register can be read while the LAN9220 is in a power sav-

ing mode.

Offset:

84h

Size:

32 bits

Note:

The LAN9220 must always be read at least once after power-up, reset, or upon return from a power-saving

state or write operations will not function.

Bits

Description

Type

Default

31:14

RESERVED

13-12

Power Management Mode (PM_MODE)

– These bits set the LAN9220 into

the appropriate Power Management mode. Special care must be taken when

modifying these bits.

Encoding:

00b – D0 (normal operation)

01b – D1 (wake-up frame and magic packet detection are enabled)

10b – D2 (can perform energy detect)

11b – RESERVED - Do not set in this mode

Note:

When the LAN9220 is in any of the reduced power modes, a write

of any data to the BYTE_TEST register will wake-up the device.

DO NOT PERFORM WRITES TO OTHER ADDRRESSES while

the READY bit in this register is cleared.

00b

RESERVED

PHY Reset (PHY_RST) – Writing a ‘1’ to this bit resets the PHY. The internal

logic automatically holds the PHY reset for a minimum of 100us. When the

PHY is released from reset, this bit is automatically cleared. All writes to this

bit are ignored while this bit is high.

Wake-On-Lan Enable (WOL_EN) – When set, the PME signal (if enabled

with PME_EN) will be asserted in accordance with the PME_IND bit upon a

WOL event. When set, the PME_INT will also be asserted upon a WOL

event, regardless of the setting of the PME_EN bit.

R/W

Energy-Detect Enable (ED_EN) - When set, the PME signal (if enabled with

PME_EN) will be asserted in accordance with the PME_IND bit upon an

Energy-Detect event. When set, the PME_INT will also be asserted upon an

Energy Detect event, regardless of the setting of the PME_EN bit.

R/W

RESERVED

PME Buffer Type (PME_TYPE) – When cleared, enables PME to function

as an open-drain buffer for use in a Wired-Or configuration. When set, the

PME output is a Push-Pull driver. When configured as an open-drain output

the PME_POL field is ignored, and the output is always active low.

R/W

NASR

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