CMI9738 Datasheet, PDF (24/36 Pages) List of Unclassifed Manufacturers – Integrated Multi-channel AC97

CMI 9738
Integrated Multi-channel AC‘97
Bit
X
REF
ANL
DAC
ADC
Function
Reserved
Vref’s up to nominal level
Analog mixers, etc. ready
DAC section ready to accept data
ADC section ready to transmit data
These bits are pseudo. Default are ready and controlled by PRX.
Bit
Function
PR0
PCM in ADC’s & Input Mux Powerdown
PR1
PCM out DACs Powerdown
PR2
Analog Mixer powerdown (Vref still on)
PR3
Analog Mixer powerdown (Vref off)
Digital Interface (AC-link) powerdown
PR4
(external clk off)
PR5
Internal Clk disable
PR6
HP amp powerdown
Except PR4, other bits are pseudo.
When set, corresponding bits will be not ready.
Ex. PR1 =1 causes DAC=0.
PRXX must set the volume to mute!!
PR4 when set will shut down the ACLINK.
Extended Audio ID Register (Index 28h) (Read Only)
Reg
Name
D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 Default
28h Extended Audio ID ID1 ID0 X X X X X X SDAC X X X X X X X 0080h
‹SDAC=1 indicates optional PCM Surround DAC is supported D15,D14:ID1,ID0 is always “00”.
Extended Audio Status and Control Register (Index 2Ah)
Reg
Name D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
Ext’d audio
2Ah
X X X PRJ X X X X SDAC X X X X X X X
Stat/Ctrl
Default
1000h
Bits D7 is read only status of the extended audio feature readiness
‹SDAC=1 indicates the PCM Surround DACs are ready (4CH mode)
Bits D12 are read/write controls of the extended audio feature powerdown
C-MEDIA Electronics Inc.
6F, 100, Sec. 4, Civil Boulevard, Taipei, Taiwan, R.O.C. 106
TEL: [phone] FAX: [phone] E-mail:[e-mail]
Revision Date Apr./2002
Revision 1.1