LAN9220 datasheet(81/142 Pages) MICROCHIP

81 / 142 page

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DS00002417A-page 81

LAN9220

5-4

WAKE-UP Status (WUPS) – This field indicates the cause of a wake-up

event detection as follows

00b -- No wake-up event detected

01b -- Energy detected

10b -- Wake-up frame or magic packet detected

11b -- Indicates multiple events occurred

WUPS bits are cleared by writing a ‘1’ to the appropriate bit. The device must

return to the D0 state (READY bit set) before these bits can be cleared.

Note:

In order to clear this bit, it is required that all event sources be

cleared as well. The event sources are described in FIGURE 3-18:

PME and PME_INT Signal Generation on page 38.

R/WC

PME indication (PME_IND). The PME signal can be configured as a pulsed

output or a static signal, which is asserted upon detection of a wake-up

event.

When set, the PME signal will pulse active for 50mS upon detection of a

wake-up event.

When clear, the PME signal is driven continuously upon detection of a wake-

up event.

The PME signal can be deactivated by clearing the WUPS bits, or by

clearing the appropriate enable (refer to Section 3.10.2.3, "Power

Management Event Indicators," on page 37).

R/W

PME Polarity (PME_POL). This bit controls the polarity of the PME signal.

When set, the PME output is an active high signal. When reset, it is active

low. When PME is configured as an open-drain output this field is ignored,

and the output is always active low.

R/W

NASR

PME Enable (PME_EN). When set, this bit enables the external PME signal.

This bit does not affect the PME interrupt (PME_INT).

R/W

Device Ready (READY). When set, this bit indicates that LAN9220 is ready

to be accessed. This register can be read when LAN9220 is in any power

management mode. Upon waking from any power management mode,

including power-up, the host processor can interrogate this field as an

indication when LAN9220 has stabilized and is fully alive. Reads and writes

of any other address are invalid until this bit is set.

Note:

With the exception of HW_CFG and PMT_CTRL, read access to

any internal resources is forbidden while the READY bit is cleared.

Note:

On power-up, this bit can be polled to indicate when a valid soft

reset (SRST) can be performed.

Bits

Description

Type

Default

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