92hdw74c2 Integrated Device Technology, 92hdw74c2 Datasheet - Page 28

• Manufacturer Part Number: 92hdw74c2
• Description: Six Channel Hd Audio Codec
• Manufacturer: Integrated Device Technology

SIX CHANNEL HD AUDIO CODEC
92HDW74C2
SIX CHANNEL HD AUDIO CODEC
GPIO
#
0
1
2
3
4
5
6
7
1.Default condition.
Pin
47
40
29
30
31
37
1.4.16. GPIO
2
4
Supply
DVDD
DVDD
DVDD
AVDD
AVDD
AVDD
AVDD
AVDD
1.4.16.1. GPIO Pin mapping and shared functions.
1.4.16.2. Volume/Digital Microphone/GPIO Selection
There are 3 functions available on pins 2 and 4. To determine which function is actually enabled on
the 2 pins, 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
3. If BIOS or other software application enables either Digital Microphones inputs through the Con-
1.4.16.3. VRefOut/GPIO Selection
Two functions are available on pins 29, 31, and 37. To determine which function is actually enabled,
the order of precedence is followed:
1. If the GPIOx function is enabled, it overrides VRefOut-X
2. If the GPIO function is not enabled through the AFG, then the VrefOut function is enabled and in
3. If using a VrefOut pin as GPIO, make sure to incorporate a 10K ohm external pull-up to AVDD to
the weak pull-up.
figuration Default Register, the Volume is disconnected and the pull-ups are disconnected with
the weak pull-downs enabled.
its default state.
prevent the pin from floating in GPI mode and to allow proper operation in open-drain GPO
mode.
SPDIF
YES
In
SPDIF
YES
Out
GPI/O
YES
YES
YES
YES
YES
YES
YES
YES
Table 12. GPIO Pin mapping
GPI
28
GPO
VrefOut
YES
YES
YES
DMIC
CLK
IN
IN
92HDW74C2
VOL
YES
YES
(GPIO/VOL)
(GPIO/VOL)
(GPIO)
(GPIO)
50K
Pull
50K
50K
50K
50K
Up
1
(SPDIF/EA
(SPDIF)
(DMIC)
(DMIC)
(DMIC)
PC AUDIO
Down
50K
50K
Pull
PD)
50K
50K
50K
V 1.0 03/08
1
1