92hd98 Integrated Device Technology, 92hd98 Datasheet - Page 22

• Manufacturer Part Number: 92hd98
• Description: Datasheet
• Manufacturer: Integrated Device Technology

92HD98
SINGLE CHIP PC AUDIO SYSTEM, CODEC+MONO SPEAKER AMPLIFIER+CAPLESS HP+LDO
IDT CONFIDENTIAL
©2009 INTEGRATED DEVICE TECHNOLOGY, INC.
EAPD PIN MODE 1:0
BTL/HP SD
BTL/HP SD MODE
BTL/HP SD INV
BTL SD
MODE1
Control Flag
0
0
0
0
0
0
0
0
1
1
0
0
1
1
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.
Table 10. Control bit descriptions for BTL amplifier and Headphone amplifier enable configurations
BTL SD
MODE0
MODE
0
0
0
0
1
1
1
1
0
1
0
1
0
1
D1 or D0) or (Analog PC_Beep is enabled and port is enabled as an output) and the port’s EAPD bit
is set to 1. The state of the EAPD pin (unless configured as an input or held low by an external circuit
when configured as an open drain output) will be the logical OR of the external amp power up
requests from all ports.
By default, the EAPD pin also functions as the Mute#/ShutDown# input for the internal BTL amplifier.
In this mode, a low value at the pin (either due to internal EAPD being 0, or to an external entity forc-
ing the pin low) will cause the internal BTL amplifier to mute or enter a low power state depending on
the amplifier configuration. (See below)
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 power on reset:
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 for ZA and ZB only) / 1 = Amp will shut down (enter a low power
state) when disabled (default for YA forward)
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.
BTL SD INV
EAPD Pin Function
NA
NA
Open Drain I/O
0
0
1
1
0
0
1
1
CMOS Output
CMOS Input
CMOS Input
EAPD Pin
Table 11. BTL Amp Enable Configuration
State
NA
NA
0
1
0
1
0
1
0
1
Table 9. EAPD Pin Mode Select
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
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)
22
Value of EAPD bit in pin widget is forced at pin
Description
Amplifier is in a low power state
Amplifier is in a low power state
Amplifier is mute (default
state when disabled
Amplifier is active
Amplifier is active
Amplifier is active
Amplifier is active
Amplifier is mute
BTL Amp State
Description
1
)
V 0.91 10/10
92HD98