92HD66B Datasheet, PDF (23/286 Pages) Integrated Device Technology – FOUR CHANNEL HD AUDIO CODECS

92HD66B
FOUR CHANNEL HD AUDIO CODECS WITH DUAL CAPLESS HEADPHONE AMPLIFIERS
Analog
BEEP
enabled
0
1
EAPD Pin value¹
Forced to low when in D2
or D3
Forced low in D2 or D3
unless port is enabled as
output
Description
Follows description in HD Audio spec. External amplifier is shut down when pin or function
group power state is D2 or D3 independent of value in EAPD bit.
Power state is ignored if port is enabled as output and port EAPD=1 to allow PC_Beep
support in D2 and D3
Table 14. EAPD Analog PC_Beep behavior
1. When pin is enabled as Open Drain or CMOS output.
AFG
Power
State
RESET#
Analog Port Power
PC_BEEP
State
Pin Behavior
D0-D3
Asserted (Low)
Enabled¹
-
Active high immediately after power on, otherwise the previous
state is retained across FG and link reset events
D0-D3
Asserted (Low)
Disabled
-
The previous state is retained across FG and link reset events
D0
De-Asserted (High)
-
-
Active - Pin reflects EAPD bit unless held low by external source.
D1
De-Asserted (High)
-
D0-D1 Active - Pin reflects EAPD bit unless held low by external source.
D2
De-Asserted (High)
Disabled
D0-D2
Pin forced low to disable external amp
D2
De-Asserted (High)
Enabled
D0-D2
Active - EAPD Pin high if any port EAPD bit =1 and that port also
enabled as output.
D3
De-Asserted (High)
Disabled
D0-D3
Pin forced low to disable external amp
D3
De-Asserted (High)
Enabled
D0-D3
Active - EAPD Pin high if any port EAPD bit=1 and that port also
enabled as output.
D3cold
De-Asserted (High)
-
-
Pin forced low to disable external amp
D4
De-Asserted (High)
-
-
Pin forced low to disable external amp
D5
De-Asserted (High)
-
-
Pin Hi-Z (off)
Table 15. EAPD Behavior
1. PC_Beep is automatically routed to ports A, B, D, and F after power-on reset while link reset is active and EAPD will be high to enable
an external amplifier. This may be disabled using a vendor specific verb. If the automatic beep path is disabled, beep will still be
supported with EAPD active in link reset if Analog Beep is manually enabled and at least one port is configured as an output before
entering link reset. If the automatic Beep routing is disabled and Analog Beep has not been manually configured before entering link
reset, then the EAPD pin will retain its current state.
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92HD66B