W83971D Datasheet, PDF (37/58 Pages) Winbond – AC97 AUDIO CODEC

Preliminary W83971D
10.1 Power Down / Power Up
PR0=1
PR1=1
PR2=1
PR4=1
Normal
ADC’s off
PR0
DAC’s off
PR1
Analog off
PR2 / PR3
Digital I/F
off
PR4
Shut off
PR0=0
&
ADC=1
PR1=0
&
DAC=1
PR2=0
&
ANL=1
Ready = 1
Default
Warm Reset
Cold Reset
Figure 10.1: Power down/Power up Procedure
Note: In the example above, the Analog Mixer has been disabled, but the Vref is still on.
Complete Power Down of the AC'97 device is achieved by sequential writes to the Power Down and
Status Control Register (Index 26h):
Normal Operation:
PR<5:0> = 0
ADC′s and Input Mux:
PR0 = 1 (write)
DAC′s:
PR1 = 1 (write)
Analog Mixer:
PR2 = 1 (write)
Vrefout:
PR3 = 1 (write)
AC-Link:
PR4 = 1 (write)
Internal Clocks:
PR5 = 1 (write)
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Publication Release Date: July 1999
Revision A1