92hd89c Integrated Device Technology, 92hd89c Datasheet - Page 30

• Manufacturer Part Number: 92hd89c
• Description: Six Channel Hd Audio Codec
• Manufacturer: Integrated Device Technology

92HD89C
Six channel HD Audio codec optimized for low power
©2009 INTEGRATED DEVICE TECHNOLOGY, INC.
EAPD PIN
MODE 1:0
HP SD
HP SD MODE
HP SD INV
IDT™ CONFIDENTIAL
Control Flag
MODE1
HP SD
0
0
1
1
0
0
0
0
0
0
0
0
1
1
Defines if EAPD pin is used as input, output, or bi-directional port (Open Drain)
0 = Amp controlled by EAPD pin only (default) / 1 = Amp controlled by power state (pin and FG) only
0 = Amp will mute when disabled. (default) / 1 = Amp will shut down (enter a low power state) when disabled
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.
value is reflected on the EAPD pin; a 1 causes the external amplifier to power up (equivalent to D0),
and a 0 causes it to power down (equivalent to D3.) When the EAPD value = 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 ECR15b, multiple ports may control EAPD. The EAPD pin
assumes the highest power state of all the 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 a double function group reset
or a power on reset:
MODE0
HP SD
MODE
0
1
0
1
0
0
0
0
1
1
1
1
0
1
EAPD Pin Function
HP SD INV
Open Drain I/O
Table 9. Headphone Amp Enable Configuration
CMOS Output
CMOS Input
CMOS Input
NA
NA
0
0
1
1
0
0
1
1
EAPD Pin
State
NA
NA
0
1
0
1
0
1
0
1
External signal controls internal amps. EAPD bit in pin widget ignored
External signal controls internal amps. EAPD bit in pin widget ignored
Value at pin is wired-AND of EAPD bit and external signal. (default)
30
Amplifier follows pin/function group power state and will
Amplifier follows pin/function group power state and will
Description
Value of EAPD bit in pin widget is forced at pin
enter a low power state when disabled
Amplifier is in a low power state
Amplifier is in a low power state
Amplifier is mute (default
Headphone Amp State
mute when disabled
Amplifier is active
Amplifier is active
Amplifier is active
Amplifier is active
Amplifier is mute
Description
1
)
V 0.91 08/09
92HD89C