92hd88b4x5ndg Integrated Device Technology, 92hd88b4x5ndg Datasheet - Page 36

• Manufacturer Part Number: 92hd88b4x5ndg
• Description: Single Chip Pc Audio System Codec+mono Speaker Amplifier+capless Hp+ldo
• Manufacturer: Integrated Device Technology

IDT PROPRIETARY / IDT
SINGLE CHIP PC AUDIO SYSTEM, CODEC+SPEAKER AMPLIFIER+CAPLESS HP+LDO
92HD88
SINGLE CHIP PC AUDIO SYSTEM, CODEC+SPEAKER AMPLIFIER+CAPLESS HP+LDO
2.22.1. General conditions in Aux Audio Mode:
2.22.2. “Playback Path” Port Behavior
CONFIDENTIAL
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Port F (Aux Audio In) input is routed to Port D (“internal speakers”) and Ports A&B (system head-
phone jacks) through the analog mixer.
itor BitClk to enter/exit this mode but must not depend on BitClk to operate.)
phone port (Normal Mode only)
trol internal resources.
The amplifiers are off if EAPD is held low.
after the application of power or EAPD=1 to prevent pops.
Internal circuitry will orchestrate power down (EAPD = 0) to prevent pops.
the speaker amplifier if the docked device has something plugged into its headphone jack.
DCN HDA015-B “clock-less D3” operation presents a problem. Clock Stop OK or similar commu-
nication will be used to prevent problems when an OS driver attempts to put the HD Audio bus
controller into D3 to save power. The bus must not be place into reset with the clock stopped or
unless EAPD is forced low or D3cold has been set. The Enable bit in the Aux Audio vendor spe-
cific verb is provided so firmware or other software can disable Aux Audio support and allow
stopping the HD Audio bus when an OS is in an active state. The default value of this bit is deter-
mined by a bond option and may be determined by reading the device ID. This bit only returns to
its default value when a power on reset event is generated.
HD Audio Link is off (RST# is 0, active, and BitClk is 0, inactive. CODEC does not need to mon-
HD Audio CODEC analog and digital supplies are active.
Port A may be an optional headphone jack (Normal and Aux Audio Mode) or an internal micro-
Port B connect to the system headphone jack.
Port C connects to the system microphone Jack
Port D connects to the internal speakers.
Port E is not present on the CODEC but the port presence detect is available and used to con-
Port F is connected to the dock AUX Audio In (it is an input port)
EAPD is used to control the power state of the mixer, BTL amplifier, and headphone amplifiers.
Internal circuitry will delay enabling (change power state, un-mute, etc.) the output amplifiers
EAPD must be forced low before removing power.
No special Dock Present signal needed. Only port presence detect for port E is used to disable
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92HD88
PC AUDIO
V 0.94 07/11