LAN9730 datasheet(102/222 Pages) MICROCHIP

102 / 222 page

LAN9730/LAN9730i

DS00001946A-page 102

 2012-2015 Microchip Technology Inc.

4.11

Power States

The following power states are featured.

• NORMAL (Unconfigured and Configured)

• Suspend (SUSPEND0, SUSPEND1, SUSPEND2, and SUSPEND3)

Figure 4-29 illustrates the power states and allowed state transitions.

4.11.1

NORMAL STATE

The NORMAL state is the fully functional state of the device. The are two flavors of the NORMAL state, NORMAL Con-

figured and NORMAL Unconfigured. In the Configured variation, all chip subsystem modules are enabled. The Uncon-

figured variation has only a subset of the modules enabled. The reduced functionality allows for power savings.

This NORMAL state is entered by any of the following methods:

• A system reset is asserted.

• The device is suspended and the host issues resume signaling.

• The device is suspended and a wake event is detected.

4.11.1.1

Unconfigured

Upon initially entering the NORMAL state, the device is unconfigured. The device transitions to the NORMAL Configured

state upon the host completion of the USB configuration.

It is possible for the device to be deconfigured by the host after being placed in the NORMAL Configured state, via a

set_configuration command. In this case, the CPM must place the device back into the NORMAL Unconfigured state.

4.11.1.2

Reset Operation

After a system reset, the device is placed into the NORMAL Unconfigured state. When in the NORMAL state, the

READY bit in the Power Management Control Register (PMT_CTL) is set. This READY bit is useful to the host after a

USB reset occurs. In this case, it indicates that the values in the EEPROM have been completely loaded.

FIGURE 4-29:

POWER STATES

Note:

It is not possible to transition from SUSPEND2 to NORMAL Configured if SUSPEND2 was entered via a

transition from NORMAL Unconfigured.

NORMAL

(Configured)

SUSPEND0

SUSPEND1

SUSPEND2

USB Resume ||

PHY Linkup ||

WOL || GPIO

USB Suspend

USB Resume ||

GPIO

USB Suspend

USB Resume ||

Energy Detect ||

GPIO

USB Suspend

POR || nRESET ||

USB Reset || SRST

NORMAL

(Unconfigured)

Configured

Deconfigured

USB Resume ||

GPIO

USB Suspend

SUSPEND3

USB Suspend

USB Resume ||

PHY Linkup ||

Frame Rec’d || GPIO

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