92HD91 Datasheet, PDF (39/298 Pages) Integrated Device Technology – SINGLE CHIP PC AUDIO SYSTEM

92HD91
SINGLE CHIP PC AUDIO SYSTEM, CODEC+SPEAKER AMPLIFIER+CAPLESS HP+LDO
2.26.2. Entering Aux Audio Mode
Enter AUX mode under two conditions, refer to figure below:
• When DVDD is powered-up, the value of AUX_enable register is “enabled” (one), and before
link reset is de-asserted (pull high).
• If AUX_enable is “enabled” (one) and the Power state is D3cold then chip will also enter AUX
mode but the Clock_Stop_OK flag is not required (set to 1 if convenient.). (Note that the part will
enter Aux mode immediately upon transition to D3cold. It is possible to return to normal opera-
tion by issuing a double AFG reset if the link is still active.)
Note: At that time, Force Portsense and BTL Amp on when we enter link reset if the AuxAudio bit
is set. If the AuxAudio bit is not set (by bond option or software) then we will not enter Aux Audio
Mode-Portsense and BTL Amp will remain off.
Port F (“dock microphone”) input is routed to Port D (“internal speakers”), Ports B (system head-
phone port), and Port E (“dock Line Out”) directly. The analog mixer is disabled to reduce power con-
sumption.
Figure 11. Switching between Normal and Aux Audio Modes
DVDD
Dig_POR
Power state
D3
D0
D3
D0
D3 cold
Link_reset
AUX_enable
(register)
Operation
mode
AUX_mode
Normal mode
D3 with clock
D3 clockless
Normal mode _{AUX_mode}
IDT™ CONFIDENTIAL
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92HD91