92HD73C データシートの表示（PDF） - Integrated Device Technology

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92HD73C

SIX CHANNEL HD AUDIO CODEC

Integrated Device Technology 

92HD73C

SIX CHANNEL HD AUDIO CODEC, PREMIUM WLP 3/4 COMPLIANT

PC AUDIO

1.4.16. GPIO

1.4.16.1. GPIO Pin mapping and shared functions.

GPIO

#

Pin

Supply

SPDIF

In

0 47 DVDD YES

1

2 DVDD

2

4 DVDD

3 40 AVDD

4 29 AVDD

5 30 AVDD

6 31 AVDD

7 37 AVDD

1.Default condition.

SPDIF

Out

GPI/O

GPI

GPO VrefOut DMIC

YES

YES

CLK

YES

IN

YES YES

YES

YES

YES

IN

YES

YES

YES

YES

Table 13. GPIO Pin mapping

VOL

YES

YES

Pull

Up

50K

(GPIO)

Pull

Down

50K1

(SPDIF/EA

PD)

50K

50K

(GPIO/VOL) (DMIC)

50K

(GPIO/VOL)

50K

(GPIO)

50K

(DMIC)

50K1

(SPDIF)

50K1

50K

(DMIC)

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

the weak pull-up.

3. If BIOS or other software application enables either Digital Microphones inputs through the Con-

figuration Default Register, the Volume is disconnected and the pull-ups are disconnected with

the weak pull-downs enabled.

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

its default state.

3. If using a VrefOut pin as GPIO, make sure to incorporate a 10K ohm external pull-up to AVDD to

prevent the pin from floating in GPI mode and to allow proper operation in open-drain GPO

mode.

29

SIX CHANNEL HD AUDIO CODEC, PREMIUM WLP 3/4 COMPLIANT

92HD73C

V 1.3 08/11

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