alc203-lf Realtek Semiconductor Corporation, alc203-lf Datasheet - Page 19

• Manufacturer Part Number: alc203-lf
• Description: Two-channel Ac?97 2.3 Audio Codec
• Manufacturer: Realtek Semiconductor Corporation

6.1.18 MX26 Powerdown Control/Status
Default: 000Fh
This read/write register is used to program power-down 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 this register is written, the bit values that come in on AC-Link will have no effect on read only bits 0-7 and bit 15.
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
PR0=1
PR1=1
PR2=1
PR3=1
PR4=1
PR5=1
PR6=1
PR7=1
Bit
7:4
15
14
13
12
11
10
Truth table for power down mode :
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
ADC
R
R
R
R
PD
PD
PD
PD
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
DAC
PD
PD
PD
PD
Blank: Don’t care
Mixer
PD
PD
1: Power down Headphone Out (HP-OUT, pin-39/41)
1: Disable internal clock
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
Verf
PD
0: Not yet ready
ACLINK Int CLK HP-OUT
PD
15
0: Not yet ready
Function
PD
PD
PD
PD
1: Power down
EAPD
PD
ALC203 DataSheet
Rev1.6