STAC9758 Datasheet, PDF (60/119 Pages) Integrated Device Technology – HIGH-PERFORMANCE 6-CHANNEL AC’97 2.3 CODEC WITH UNIVERSAL JACKS

STAC9758/9759
HIGH-PERFORMANCE 6-CHANNEL AC’97 2.3 CODEC WITH UNIVERSAL JACKS™
PC AUDIO
8.2.11. DAC-B to Mixer2 Volume Control (14h)
Default: 8808h.
D15
Mute
D7
RMute
D14
D13
RESERVED
D6
D5
RESERVED
D12
GL4
D4
GR4
D11
GL3
D3
GR3
D10
GL2
D2
GR2
D9
GL1
D1
GR1
D8
GR0
D0
GR0
Bit(s) Reset Value R/W Name
Description
0 = no mute
1 = mute
15
1
RW
Mute
The channels to be affected are determined by the SPLITMUTE bit
(Reg 72, Page 0, D6).
If SPLITMUTE = 0, both Left and Right channels are muted
If SPLITMUTE = 1, only the Left Channel is muted
14:13
0
RO RESERVED Bit not used, should read back 0
DAC-BL Volume Control
00h = 00000b = +12.0 dB gain
01h = 00001b = +10.5 dB gain
12:8
08
RW GL<4:0> .....
08h = 01000b = 0 dB - unity gain (default)
.....
1Fh = 11111b = -34.5 dB attenuation
Mutes Right Channel independent of Left Channel
0 = unmute
1 = muted
7
0
RW RMute The SPLITMUTE bit (Reg 72, Page 0, D6) must be set to 1 in order for the
RMute bit to have an effect on the sound.
The RMute bit is R/W. The RMute bit may be written and read regardless
of the state of the SPLITMUTE bit.
6:5
0
RO RESERVED Bit not used, should read back 0
DAC-BR Volume Control
00h = 00000b = +12.0 dB gain
01h = 00001b = +10.5 dB gain
4:0
08
RW GR<4:0> .....
08h = 01000b = 0 dB - unity gain (default)
.....
1Fh = 11111b = -34.5 dB attenuation
8.2.11.1. Video In Use
The STAC9758 VIDEO_IN path to the mixer (including the volume control of Register 14h) is used
by DAC-B. The VIDEO_IN pins are redefined as the second microphone input. However, the Video
Input functionality can be implemented by the flexible input/output structure of the
STAC9758, called Universal Jacks. This technology allows for selectable input paths. The
STAC9758 has a Line In Mux that can select a variety of input options. Using the Line In Mux to
IDT™
60
HIGH-PERFORMANCE 6-CHANNEL AC’97 2.3 CODEC WITH UNIVERSAL JACKS™
STAC9758/9759
V 1.2 1206