CS4207-CNZ Datasheet, PDF (48/148 Pages) Cirrus Logic – Low-power, 4-in / 6-out HD Audio Codec with Headphone Amp

6.4.6
Power States
Get Parameter Command Format:
Bits [31:28]
CAd = X
Bits [27:20]
DAC1 Node ID=02h
DAC2 Node ID=03h
DAC3 Node ID=04h
Bits [19:8]
Verb ID = F05h
CS4207
Bits [7:0]
Payload = 00h
Set Parameter Command Format:
Bits [31:28]
CAd = X
Bits [27:20]
DAC1 Node ID=02h
DAC2 Node ID=03h
DAC3 Node ID=04h
Bits [19:8]
Verb ID = 705h
Bits [7:0]
Payload = xxh
Response Format:
Bits
31:11
Type
Read Only
10
Read Only
9
Read Only
8
Read Only
7:4
Read Only
3:0
Read/Write
Default
00000h
1b
0b
0b
0011b
0011b
Description
Reserved
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
Section 4.6
Reserved
Power State Error (PS-Error): This bit is not
supported and will always return ‘0’b when read.
Power State Actual (PS-Act): This field indi-
cates the actual power state of the referenced
node. The default state is D3.
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
Section 4.4 for more information.
PSS = ‘0100’b; D4 - Not Supported
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).
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