ALC250 Datasheet, PDF (18/46 Pages) List of Unclassifed Manufacturers – TWO CHANNEL AC’97 2.3 AUDIO CODEC with EQUALIZER

ALC250 Data Sheet
Once PG[3:0] is not 0000b and 0001b, ALC250 will return zero data for ACLINK mixer read command.
6.1.18 MX26 Powerdown Control/Status
Default: 000Fh
This read/write register is used to program powerdown states and monitor subsystem readiness. The lower half of this register is
read only status; a “1” indicating that the subsection is “ready.” Ready is defined as the subsection’s ability to perform in its nominal
state.
When the AC-Link “CODEC Ready” indicator bit (SDATA_IN slot 0, bit 15) is a 1, it indicates that the AC-Link and AC’97
control and status registers are in a fully operational state. The AC’97 controller must further probe this powerdown control
/status register to determine exactly which subsections, if any are ready.
Bit Type
Function
15
R/W PR7 External Amplifier Power Down (EAPD) 0: Normal 1: Power down
14
R/W PR6 0: Normal 1: Power down Headphone Out (HP-OUT, pin-39/41)
13
R/W PR5 0: Normal 1: Disable internal clock
12
R/W PR4 0: Normal 1: Power down AC-Link
11
R/W PR3 0: Normal 1: Power down Mixer (Vref off)
10
R/W PR2 0: Normal 1: Power down Mixer (Vref still on)
9
R/W PR1 0: Normal 1: Power down PCM DAC
8
R/W PR0 0: Normal 1: Power down PCM ADC and input MUX
7:4
Reserved, Read as 0
3
R Vref Status 1: Vref is up to normal level 0: Not yet ready
2
R Analog Mixer Status 1: Ready 0: Not yet ready
1
R DAC Status 1: Ready 0: Not yet ready
0
R ADC Status 1: Ready 0: Not yet ready
True table for power down mode :
ADC DAC Mixer Verf ACLINK Int CLK HP-OUT EAPD
PR0=1 PD
PR1=1
PD
PR2=1
PD
PD
PR3=1 PD
PD
PD
PD
PD
PR4=1 PD
PD
PD
PR5=1 PD
PD
PD
PR6=1
PD
PR7=1
PD
PD: Power down
Blank: Don’t care
If Mixer is power down (PR2=1 or PR3=1), the LINE-OUT (pin-35/36) is shut down and its output is floated.
If Headphone-Out is power down (PR6=1), the HP-OUT (pin-39/41) is shut down and its output is floated.
Two Channel AC’97 2.3 Audio Codec
14
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