ALC202 데이터 시트보기 (PDF) - Realtek Semiconductor
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ALC202 Datasheet PDF : 42 Pages
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ALC202/ALC202A
6.1.17 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 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.
Bit Type
Function
15
R/W PR7 External Amplifier Power Down (EAPD): 1: Power down 0: Normal
14
R/W PR6: 1: Power down Headphone Out (HP-OUT, pin-39/41) 0: Normal
13
R/W PR5: 1: Disable internal clock 0: Normal
12
R/W PR4: 1: Power down AC-Link 0: Normal
11
R/W PR3: 1: Power down Mixer (Vref off) 0: Normal
10
R/W PR2: 1: Power down Mixer (Vref still on) 0: Normal
9
R/W PR1: 1: Power down PCM DAC 0: Normal
8
R/W PR0: 1: Power down PCM ADC and input MUX 0: Normal
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
❷If Mixer is power down (PR2=1 or PR3=1), the LINE-OUT (pin-35/36) is shut down and its output is floated.
❸If Headphone-Out is power down (PR6=1), the HP-OUT (pin-39/41) is shut down and its output is floated.
2002/07/30
16
Rev.1.28
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