alc850 Realtek Semiconductor Corporation, alc850 Datasheet - Page 25

• Manufacturer Part Number: alc850
• Description: Eight Channel Ac?97 2.3 Audio Codec
• Manufacturer: Realtek Semiconductor Corporation

7.1.15.
Default: 0000H
This read/write register is used to program power-down states and monitor subsystem readiness. The
lower half of this register is read-only; 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 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 power down control/status register
to determine exactly which subsections, if any, are ready.
Eight Channel AC’97 2.3 Audio Codec
7:4
Bit
15
14
13
12
10
11
9
8
3
2
1
0
MX26 Power Down Control/Status
Type
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R
R
R
R
-
-
Function
PR7 External Amplifier Power Down (EAPD)
0: EAPD output low (enable external amplifier)
1: EAPD output high (shut down external amplifier)
Reserved
PR5
0: Normal
1: Disable internal clock usage (BCLK remains output for modem codec)
PR4
0: Normal
1: Power down AC-Link
PR3
0: Normal
1: Power down Mixer (Vref off)
PR2
0: Normal
1: Power down Mixer (Vref still on)
PR1
0: Normal
1: Power down PCM DAC (front DAC)
PR0
0: Normal
1: Power down PCM ADCs and input MUX
Reserved. Read as 0
Vref Status
1: Vref is up to normal level
0: Not yet
Analog Mixer Status
1: Ready
0: Not yet
DAC Status
1: Ready
0: Not yet
ADC Status
1: Ready
0: Not yet
Table 20. MX26 Power Down Control/Status
17
Track ID: JATR-1076-21 Rev. 1.4
Datasheet
ALC850