CMI9738 Datasheet, PDF (25/36 Pages) List of Unclassifed Manufacturers – Integrated Multi-channel AC97

CMI 9738
Integrated Multi-channel AC‘97
‹PRJ=1 turns the PCM Surround DACs off (4CH mode)
The default value after cold or warm register reset for this register (xxxxh) is all extended features
disabled (D3-D0=0) and powered down (D12=1). The feature readiness status should always be
accurate (D7=x).
These bits are pseudo.
When 2Ch, 4CH, these bits are still visible.
PRXX must set volume to mute
4-Channel Volume Control Register (Index 38h) (R/W)
D1 D1
Reg Name D15
D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 Default
43
4CH
38h Vol:L,R Mute X X LSR4 LSR3 LSR2 LSR1 LSR0 Mute X X RSR4 RSR3 RSR2 RSR1 RSR0 8080h
Surr
These read/write registers control the output volume of the optional four PCM channels, and values
written to the fields behave the same as the Play Master Volume Register (Index 02h), which offers
attenuation but no gain. There is an independent mute (1=on) for each channel.
The default value after cold or warm register reset for this register (8080h) corresponds to 0 dB
attenuation with mute on.
When 2/4 CH, these registers are still visible and controllable.
The all bits of the reg38h are pseudo.
Vendor Defined Register (Index 5Ah) (R/W)
Reg Name D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 Default
Vendor
5Ah defined X X F2R X X S2LNI X X X X X X X X X X
Control
0000h
S2LNI Surround to Line in selection.
“0” disable (default)
“1” enable
F2R Front channels are routed to rear channels.
“0” disable (default)
“1” enable
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Revision Date Apr./2002
Revision 1.1