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STAC9204/9205
4-CHANNEL HD AUDIO CODEC WITH QUAD DIGITAL MICROPHONE INTERFACE
PC AUDIO
IDT
175
STAC9204/9205
V 1.0 12/06
4-CHANNEL HD AUDIO CODEC WITH QUAD DIGITAL MICROPHONE INTERFACE
3.4.29.
ExtVolume Node (NID = 0x24)
3.4.29.1.
ExtVolume WCap
Table 421. PCBeep Gen Command Response Format
Bit
Bitfield Name
RW
Reset
Description
[31:8]
Rsvd
R
0x0
Reserved
[7:0]
Divider
RW
0x0
Enable internal PC-Beep generation.
Divider = 00h - disables internal PC Beep generation and
enables normal operation of the CODEC.
Divider not equal to 00h - generates the beep tone on all Pin
Complexes that are currently configured as outputs.
The HD Audio spec states that:
beep tone frequency = (48 KHz HD Audio SYNC rate) /
(4*Divider),
producing tones from 47 Hz to 12 KHz (logarithmic scale).
Instead, this part generates tones with frequency = 48000 *
(257 - Divider) / 1024, yielding a linear range from 12 KHz to
93.75 Hz in steps of 46.875 Hz. If JackSenseVSR[Rate2x],
then the beep tones generated have frequency = 48000 * (513
- Divider) / 1024, yielding a range of 24 KHz to 12093.75 Hz in
steps of 46.875 Hz.
Table 422. ExtVolume WCap Command Verb Format
Verb ID
Payload
Response
Get
F00
09
See bitfield table.
Table 423. ExtVolume WCap Command Response Format
Bit
Bitfield Name
RW
Reset
Description
[31:24]
Rsvd2
R
0x0
Reserved
[23:20]
Type
R
0x6
Widget type = Volume Knob Widget.
Volume Knob (6h) if VOLUME enabled,
Vendor Defined (Fh) otherwise
[19:0]
Rsvd1
R
0x0
Reserved. Software assumes capability of
unsolicited responses and a connection list
for this widget type.