alc250-lf Realtek Semiconductor Corporation, alc250-lf Datasheet - Page 19

• Manufacturer Part Number: alc250-lf
• Description: Two-channel Ac?97 2.3 Audio Codec With Equalizer
• Manufacturer: Realtek Semiconductor Corporation

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.
Two-Channel AC’97 2.3 Audio Codec
Truth table for power down mode :
Bit
7:4
15
14
13
12
11
10
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.
9
8
3
2
1
0
PD: Power down
Type
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
PR0=1
PR1=1
PR2=1
PR3=1
PR4=1
PR5=1
PR6=1
PR7=1
R
R
R
R
PR7 External Amplifier Power Down (EAPD) 0: Normal
PR6 0: Normal
PR5 0: Normal
PR4 0: Normal
PR3 0: Normal
PR2 0: Normal
PR1 0: Normal
PR0 0: Normal
Reserved, Read as 0
Vref Status 1: Vref is up to normal level
Analog Mixer Status 1: Ready
DAC Status 1: Ready 0: Not yet ready
ADC Status 1: Ready 0: Not yet ready
ADC
PD
PD
PD
PD
Blank: Don’t care
DAC
PD
PD
PD
PD
1: Disable internal clock
1: Power down Headphone Out (HP-OUT, pin-39/41)
1: Power down AC-Link
1: Power down Mixer (Vref off)
1: Power down Mixer (Vref still on)
1: Power down PCM DAC
1: Power down PCM ADC and input MUX
Mixer
PD
PD
0: Not yet ready
Verf
PD
14
0: Not yet ready
ACLINK Int CLK HP-OUT
Function
PD
PD
1: Power down
PD
PD
PD
ALC250 DataSheet
EAPD
PD
Rev1.3