92HD66B Datasheet, PDF (22/286 Pages) Integrated Device Technology – FOUR CHANNEL HD AUDIO CODECS

92HD66B
FOUR CHANNEL HD AUDIO CODECS WITH DUAL CAPLESS HEADPHONE AMPLIFIERS
1, the EAPD pin must be placed in a state appropriate to the current power state of the associated
Pin Widget even though the EAPD value (in the register) may remain 1. The pin defaults to an
open-drain configuration (an external pull-up is recommended.)
Per the HD Audio specification and HDA015-B, multiple ports may control EAPD. The EAPD pin
assumes the highest power state of all the EAPD bits in all of the pin complexes. The default value of
EAPD is 1 (powered on), but the FG power state will override and the pin will be low.
Vendor specific verbs are available to configure this pin. These verbs retain their values across link
and single function group resets but are set to their default values by power on reset:
MODE1
0
0
1
1
MODE0
0
1
0
1
EAPD Pin Function
Open Drain I/O
CMOS Output
CMOS Input
CMOS Input
Description
Value at pin is wired-AND of EAPD bit and external signal.(default)
Value of EAPD bit in pin widget is forced at pin
External signal controls internal amps. EAPD bit in pin widget ignored
External signal controls internal amps. EAPD bit in pin widget ignored
Table 11. EAPD Pin Mode Select
Control Flag
Description
EAPD PIN MODE 1:0 Defines if EAPD pin is used as input, output, or bi-directional port (Open Drain)
HP SD
0 = Amp controlled by EAPD pin only (default) / 1 = Amp controlled by power state (pin and FG) only
HP SD MODE
0 = Amp will mute when disabled (default) / 1 = Amp will shut down (enter a low power state) when disabled
HP SD INV
0 = AMP will power down (or mute) when EAPD pin is low (default) / 1 = Amp will power down (or mute)
when EAPD pin is high.
Table 12. Control bit descriptions for BTL amplifier and Headphone amplifier enable configurations
HP SD
0
0
0
0
0
0
0
0
1
1
HP SD
MODE
0
0
0
0
1
1
1
1
0
1
HP SD INV
0
0
1
1
0
0
1
1
NA
NA
EAPD Pin
State
0
1
0
1
0
1
0
1
NA
NA
Headphone Amp State
Amplifier is mute (default¹)
Amplifier is active
Amplifier is active
Amplifier is mute
Amplifier is in a low power state
Amplifier is active
Amplifier is active
Amplifier is in a low power state
Amplifier follows pin/function group power state and will mute when
disabled
Amplifier follows pin/function group power state and will enter a low
power state when disabled
Table 13. BTL Amp Enable Configuration
1. EAPD bit is set to one by default but the EAPD state is 0 after power-on reset because the function group is not in D0.
The state after a single or double function group reset will be compliant with HDA015-B.
Each Headphone port has its own configuration bits for SD, SD MODE, and SD INV.
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92HD66B