PIC16F639-E/SS【PDF 29/74 页】IC MCU FLASH 2KX14 20SSOP

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Sheet目录3876

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Micrel, Inc.

KSZ8841-PMQL

October 2007

M9999-100407-1.5

Power-Management Control and Status Register (CPMC Offset 54H)

The CMPC register is a power-management control and status register. This register can control and sate power

management events. The following table shows the CMPC register bit fields.

Bit

Default

Description

31 - 16

0x0000

Reserved

PME_Status

This bit indicates that the KSZ8841-PMQL has detected a power-

management event. If bit PME_Enable is set, the KSZ8841-PMQL also

asserts the PME_N pin. This bit is cleared on power-up reset or by write

1. It is not modified by either hardware or software reset. When this bit is

cleared, the KSZ8841-PMQL deserts the PME_N pin.

14 - 9

0x00

Reserved

PME_Enable

If this bit is set, the KSZ8841-PMQL can assert the PME_N pin.

Otherwise, assertion of the PME_N pin is disabled. This bit is cleared on

power-up reset only and is not modified by either hardware or software

reset.

7 - 4

0x0

Reserved

No Soft Reset

If this bit is set (“1”), the KSZ8841-PMQL does not perform an internal

reset when transitioning from D3_hot to D0 because of PowerState

commands. Configuration context is preserved. Upon transition from

D3_hot to the D0 Initialized state, no additional operating system

intervention is required to preserve configuration context beyond writing

the PowerState bits.

If this bit is cleared (“0”), the KSZ8841-PMQL does perform an internal

reset when transitioning from D3_hot to D0 via software control of the

PowerState bits. Configuration context is lost when performing the soft

reset. Upon transition from D3_hot to the D0 state, full reinitialization

sequence is needed to return the device to D0 Initialized.

Regardless of this bit, devices that transition from D3_hot to D0 by a

system or bus segment reset will return to the device state D0

Uninitialized with only PME context preserved if PME is supported and

enabled.

Reserved

1 - 0

Power State

This field is used to set the current power state of the KSZ8841-PMQL

and to determine its power state. The definitions of the field values are:

0: D0

1: D1

2: D2

3: D3(hot)

This field gets a value of 0 after power up.

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