STAC9766 IDT [Integrated Device Technology], STAC9766 Datasheet - Page 57

• Manufacturer Part Number: STAC9766
• Manufacturer: IDT [Integrated Device Technology]

IDT™
TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING
STAC9766/9767
TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING
8.1.17.
Bit(s) Reset Value
14-13
15
12
11
D15
D7
I4
The three separation ratios are implemented. The separation ratio defines a series of equations that
determine the amount of depth difference (High, Medium, and Low) perceived during two-channel
playback. The ratios provide for options to narrow or widen the soundstage.
Audio Interrupt and Paging (24h)
Default: 0000h
0
0
0
0
D14
D6
I3
Read / Write
Read / Write
Read / Write
RESERVED
Read Only
Access
D13
D5
I2
Name
I3-I2
I4
I1
I0
D12
57
D4
0 = Interrupt is clear
1 = Interrupt is set
Interrupt event is cleared by writing a 1 to this bit.
The interrupt bit will change regardless of condition of interrupt
enable (I0) status. An interrupt in the GPI in slot 12 in the ACLink
will follow this bit change when interrupt enable (I0) is unmasked.
Interrupt Cause
00 = Reserved
01 = Sense cycle complete, sense info available.
10 = Change in GPIO input status
11 = Sense cycle complete and change in GPIO input status.
These bits will reflect the general cause of the first interrupt event
generated. It should be read after interrupt status has been
confirmed as interrupting. The information should be used to scan
possible interrupting events in proper pages.
Sense Cycle
0 = Sense Cycle not in Progress
1 = Sense Cycle Start.
Writing a 1 to this bit causes a sense-cycle start, if supported. If
sense cycle is not supported, this bit is read only.
Interrupt Enable
0 = Interrupt generation is masked.
1 = Interrupt generation is un-masked.
The driver should not un-mask the interrupt unless ensured by the
AC‘97 controller that no conflict is possible with modem slot 12 -
GPI functionality. Some AC’97 2.2 compliant controllers will not
likely support audio CODEC interrupt infrastructure. In either case,
software should poll the interrupt status after initiating a sense
cycle and wait for Sense Cycle Max Delay to determine if an
interrupting event has occurred.
I1
PG3
D11
D3
I0
STAC9766/9767
Description
PG2
D10
D2
RESERVED
PG1
D9
D1
PC AUDIO
V 7.4 12/06
PG0
D8
D0