Cirrus-logic CS4207 User Manual download pdf (Page 116)

116 DS880F4

CS4207

6.13.4 Power States

Get Parameter Command Format:

Set Parameter Command Format:

Response Format:

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

node is of type other than an Audio Function Group node, the actual power state is a function of both this

setting and the PowerState setting of the Audio Function Group node under which this node was enumer-

ated (is controlled).

PS-Act is a PowerState field which indicates the actual power state of this node. Within the Audio Func-

tion Group node, this field will always be equal to the PS-Set field (modulo the time required to execute a

power state transition). Within this type of node, this field will be the lower power consuming state of either

a) the PS-Set field of the currently referenced node or b) the PS-Set field of the Audio Function Group

node under which the currently referenced node was enumerated (is controlled).

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

CAd = X Node ID = 0Fh Verb ID = F05h Payload = 00h

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

CAd = X Node ID = 0Fh 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

within this widget 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 follow-

ing a POR condition. For more information, see

“Power State Settings Reset (PS-SettingsRe-

set)” on p 28

9 Read Only 0b Reserved

8 Read Only 0b

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

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

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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