92HD87 Datasheet, PDF (23/204 Pages) Integrated Device Technology – SINGLE CHIP PC AUDIO SYSTEM

92HD87
SINGLE CHIP PC AUDIO SYSTEM, CODEC+STEREO SPEAKER AMPLIFIER+CAPLESS HP+LDO
2.16. EAPD
The EAPD pin (pin 47) is a dedicated, bi-directional control pin. Although named External Amplifier
Power Down (EAPD) by the HD Audio specification, this pin operates as an external amplifier power
up signal. The EAPD 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 default state of this pin
is 0 (driving low.) The pin defaults to an open-drain configuration (an external pull-up is recom-
mended.)
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. A port will
request External Amp Power Up when its power state is active (FG and pin widget power state is 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:
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
Control Flag
Description
EAPD PIN
MODE 1:0
Defines if EAPD pin is used as input, output, or bi-directional port (Open Drain)
BTL/HP SD
0 = Amp controlled by EAPD pin only (default) / 1 = Amp controlled by power state (pin and FG) only
BTL/HP SD
MODE
0 = Amp will mute when disabled. / 1 = Amp will shut down (enter a low power state) when disabled (default)
BTL/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.
IDT CONFIDENTIAL
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V 0.995 01/11
92HD87