Audio Codec '97

AC ‘97 Component Specification Revision 2.3 Rev 1.0
91
state of the Codec(s), and the power management state of the system.
Table 46, Table 47, and Table 48 break down the AC-link behavior that must occur when resuming the AC-link as a
function of audio Codec device state, modem Codec device state, and system state.
Audio Codec
D-State
System State
(ACPI: S0-S5)
Resume activity Comments
D0 S0 N/A Audio active; System is operating in the
Working State
D1 S0 or S1 No reset; PR bits
modified
Audio idle; System is either operating in the
Working State or is in S1 sleep state
D2 S0, S1, or S2 No reset; PR bits
modified
Audio idle; System is either operating in the
Working State, or is in S1 or S2 sleep state
D3hot S0, S1, or S2 PR bits modified,
preceded by a Warm
Reset if PR4 was set
Audio idle; System is either operating in the
Working State, or is in S1 or S2 sleep state
D3cold S3, S4, or S5 Cold Reset; full Codec
register and context
restoration
Deep sleep state; no power to audio Codec
Table 46. Resume Reset Behavior: Audio-only
Modem Codec
D-State
System State
(ACPI: S0-S5)
Resume activity Comments
D0 S0 N/A Modem active; System is operating in the
Working State
D1 S0 or S1 No reset; PR bits modified Modem idle; System is either operating in the
Working State or is in S1 sleep state
D2 S0, S1, or S2 No reset; PR bits modified Modem idle; System is either operating in the
Working State, or is in S1 or S2 sleep state
D3hot S0, S1, or S2 PR bits modified, preceded
by a Warm Reset if MLNK
was set
Modem idle; System is either operating in the
Working State, or is in S1 or S2 sleep state
D3cold S3, S4, or S5 Cold reset to AC-link;
modem Codec must
interpret this as a warm
reset; modem Codec may
need partial context
restoration
Deep sleep state; only auxiliary power
available to the modem Codec; modem may
be armed to answer the phone (except when
in ACPI S5)
Table 47. Resume Reset Behavior: Modem-only