LAN89730 datasheet(128/218 Pages) MICROCHIP

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LAN89730

DS60001348A-page 128

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6.3.8

POWER MANAGEMENT CONTROL REGISTER (PMT_CTL)

This register controls the power management features.

Address:

020h

Size:

32 bits

Bits

Description

Type

Default

31:10

RESERVED

Resume Clears Remote Wakeup Status (RES_CLR_WKP_STS)

When set, the Remote Wakeup Frame Received (WUFR), Magic Packet

Received (MPR), Perfect DA Frame Received (PFDA_FR) and Broadcast

Frame Received (BCAST_FR) status signals in the Wakeup Control and Sta-

tus Register (WUCSR) will clear upon the completion of a resume sequence.

When set, this bit also affects the WUPS field. WUPS[1] will clear upon com-

pletion of a resume event.

When cleared, the wakeup status signals are not cleared after a resume.

R/W

Resume Clears Remote Wakeup Enables (RES_CLR_WKP_EN)

when asserted, all wakeup enable bits are cleared after a resume sequence,

initiated from a remote wakeup, completes. Resumes initiated by the host do

not clear the wakeup enables.

Note:

Global Unicast Wakeup Enable (GUEN), Perfect DA Wakeup

Enable (PFDA_EN), Wakeup Frame Enable (WUEN), Magic Packet

Enable (MPEN), and Broadcast Wakeup Enable (BCAST_EN) are

not included.

R/W

Device Ready (READY)

When set, this bit indicates that the device is in the NORMAL state and the ini-

tial hardware configuration of the device has been completed.

Note:

This bit is useful for events (USB Reset) that do not trigger a soft

disconnect.

Note:

In the case where no PHY clocks are present to complete a system

reset, this bit will not be set until the watchdog timer expires. This

is applicable for a Lite Reset and when transitioning to the Normal

Configured state.

6:5

Suspend Mode (SUSPEND_MODE)

Indicates which suspend power state to use after the host suspends the

device.

If the device is deconfigured, it transitions to the NORMAL Unconfigured state

and this register will reset to the value 10b.

SUSPEND_MODE encoding:

00 = SUSPEND0

01 = SUSPEND1

10 = SUSPEND2

11 = SUSPEND3

Note:

It is not valid to select any suspend variant besides SUSPEND2

when in the NORMAL Unconfigured state.

R/W

10b

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