92HD71B7 Datasheet, PDF (23/216 Pages) Integrated Device Technology – 4-CHANNEL HD AUDIO CODEC OPTIMIZED FOR LOW POWER

92HD71B7
4-CHANNEL HD AUDIO CODEC OPTIMIZED FOR LOW POWER
PC AUDIO
1.4.14.
Analog PC-Beep
92HD71B7 does not support automatic routing of the PC_Beep pin to all outputs when the link is in
reset. Analog PC-Beep may be supported during Link Reset if the mixer is present and manually
configured for pass-thru. Reset# must be high and Bit_Clk active. Analog PC_Beep is available as
an input to the analog mixer.
1.4.15.
Headphone Drivers
This product implements a +3dBV output option on headphone capable ports. (HP output and line
output levels are defined as 1Vrms with an option to enable +3dBV FSOV using a vendor specific
verb.)
1.4.16. GPIO
1.4.16.1. GPIO Pin mapping and shared functions.
GPIO
#
Pin
Supply
SPDIF
In
1
2 DVDD
2
4 DVDD
3 30 AVDD
4 31 AVDD
5 43 DVDD
6 44 DVDD
7 45 DVDD
0 47 DVDD
1.Default condition.
Table 10. GPIO Pin mapping and shared functions
SPDIF
Out
GPI/O
GPI
GPO VrefOut ADAT DMIC
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES YES
YES
YES
VOL
YES
YES
Pull
Up
50K
(GPIO/VO
L)
50K
(GPIO/VO
L)
50K¹
Pull
Down
50K
(DMIC)
50K
(DMIC)
50K<super
script>1
50K<super
script>1
50K
(GPIO)
50K1
(SPDIF)
50K
(GPIO)
50K1
(SPDIF/EA
PD)
1.4.16.2. Volume/Digital Microphone/GPIO Selection
To determine which function is actually enabled on pins2 and 4, the order of precedence is followed:
1) If the GPIOs are enabled, they override both Volume Control and Digital Mics
2) If the GPIOs are not enabled through the AFG, then at reset, the Volume control is enabled with
the weak pull-up.
IDT™ CONFIDENTIAL AND PROPRIETARY
23
4-CHANNEL HD AUDIO CODEC OPTIMIZED FOR LOW POWER
92HD71B7
V 0.9 07/07