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Intel® ICH5 AC ’97 Controller Theory of Operation
R
32 AC ’97 Programmer’s Reference Manual
• Modem D3 configuration is dependent on wake-up on ring event enable. If wake-up on ring is
enabled, GPIO cannot go down in D3.
Note: When a codec section is powered back on the Powerdown Control/Status register (index 26h)
should be read to verify that the section is ready before attempting any further operations.
Configuration Number 1: Single Audio Codec (Primary):
Table 14. Power State Mapping for Audio Single or Dual (Split) Codec Desktop Transition
PR<0:5> + (EAPD)
+12 +5
from
+12
+3.3
Digital
+3.3
Vaux
Digital
Comments
E
A
P
D
C
L
K
AC-
Link
Mixer
Vref.
Mixer D
A
C
A
D
C
Device
State
7 5 4 3 2 1 0
D0 0 0 0 0 0 0 0 On On On On All on
D1 0 0 0 0 0 1 1 On On On On -DAC, -ADC
D2 1 0 0 0 1 1 1 On On On On -Mix, -Amp
D3 1 1 1 1 1 1 1 Off Off Off On -Clock, -Vref
Configuration Number 2: Single Modem Codec (Primary):
Table 15. Power State Mapping for Modem Single Codec Desktop Transition
PR<A:D> + MLNK
(other power control (PRx) bits do not apply for Intel
®
ICH5
implementation)
+12 +5
from
+12
+3.3
Digital
+3.3
Vaux
Digital
Comments
Sdata_In D
A
C
1
A
D
C
1
Vref GPIO
Device State MLNK D C B A
D0 0 0 0 0 0 On On On On All on
D1 0 1 1 0 0 On On On On -DAC, -ADC
D2 0 1 1 0 0 On On On On Same as D1
D3
(wake-up on ring)
1 1 1 0 0 Off Off Off On -Sdata_In,
D3 1 1 1 1 1 Off Off Off On -Sdata_In,
-Vref, -GPIO