Cirrus-logic CS4207 User Manual download pdf (Page 41)

DS880F4 41

CS4207

6.3.8 Power States

Get Parameter Command Format:

Set Parameter Command Format:

Response Format:

PS-Set is a Power State field which defines the current power setting of the referenced node. Since this

node is an Audio Function Group node, the actual power state is this setting. Setting this field to the D3

Bits [31:28] Bits [27:20] Bits [19:8] Bits [7:0]

CAd = X Node ID = 01h Verb ID = F05h Payload = 00h

Bits [31:28] Bits [27:20] Bits [19:8] Bits [7:0]

CAd = X Node ID = 01h Verb ID = 705h Payload = xxh

Bits Type Default Description

31:11 Read Only 00000h Reserved

10 Read Only 1b

Power State Settings Reset (PS-SettingsRe-

set): This bit is set to ‘1’b when, during any type

of reset or low power state transition, the settings

that were changed from the defaults, either by

software or hardware, have been reset back to

their default state. When these settings have not

been reset, this is reported as ‘0’b. This bit is

always a ‘1’b following a POR condition. For

more information, see “Power State Settings

Reset (PS-SettingsReset)” on p 28.

9 Read Only 1b

Power State Clock Stop OK (PS-ClkStopOK):

This bit is set to a ‘1’b when the codec is capable

of continuing proper operation even when the

HD Audio Bus BITCLK has been stopped. This

bit is valid for the Audio Function Group node

and not the device widgets.

8 Read Only 0b

Power State Error (PS-Error): This bit is not

supported and will always return ‘0’b when read.

The power state requested by software will

always be possible following a reasonable time

required to execute the power state transition.

There are no dependencies unknown to software

between nodes that would inhibit transitioning to

the requested power state.

7:4 Read Only 0011b

Power State Actual (PS-Act): This field indi-

cates the actual power state of the referenced

node. The default state is D3.

3:0 Read/Write 0011b

Power State Set (PS-Set): Writes to these bits

set the Audio Function Group to the Power State

as described below:

PSS = ’0000’b; D0 - Fully on.

PSS = ‘0001’b; D1 - Not Supported

PSS = ‘0010’b; D2 - Not Supported

PSS = ‘0011’b; D3 - Allows for lowest possible

power consumption under software control. See

“D3 Lower Power State Support” on page 26 for

more information.

PSS = ‘0100’b; D4 - Not Supported

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Cirrus-logic CS4207 User Manual Page 41

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