AD1812

REV. 0

–15–

Table XIV. Codec Power-Down Modes

Mode

Powered-Down Blocks

Total Power Down

ADC, DAC, Mixer, Reference

Standby

ADC, DAC, Mixer

Mixer Power Down

DAC, Mixer

Mixer Only

ADC, DAC

ADC Power Down

ADC

DAC Power Down

DAC

The registers found in the vendor defined PnP space take prece-

dence over any other power-down mode. You can shut down

the embedded DSP or the entire codec by writing to these

registers.

Table XV. PnP Power-Down Modes

Mode

Powered-Down Blocks

Total Power Down

DSP and SoundPort Codec

CODEC CONTROL REGISTER ARCHITECTURE

Upon Plug and Play initialization, a base address is assigned for

the Windows Sound System Compatible logical device embed-

ded in the AD1812. The AD1812 accepts both data and con-

trol information through the 16-bit interface.

Table XVI. Codec Direct Register Map

Windows Sound System Address

Register Name

Base + 0

Index Address Register

Base + 2

Indexed Data Register

Base + 4

Status Register

Base + 6

PIO Data Registers

A write to or a read from the Indexed Data Register will access

the Indirect Register which is selected by the value most recently

written to the Index Address Register. The Status Register and

the PIO Data Register are always accessible directly, without in-

dexing. The 32 Indirect Registers are shown in Table XVII.

Table XVII. Codec Indirect Register Map

Windows Sound System Codec

Indexed Register

Index

Reset State

Left Input Control

0x00

0x80

Right Input Control

0x01

0x80

Left Aux #1 Input Control

0x02

Right Aux #1 Input Control

0x03

0x9F

Left Aux #2 Input Control

0x04

0x9F

Right Aux #2 Input Control

0x05

0x9F

Left Output Control

0x06

0xBF

Right Output Control

0x07

0xBF

Clock and Data Format

0x08

0x08

Interface Configuration

0x09

0x00

Pin Control

0x0A

0x05

Test and Initialization

0x0B

0x20

Miscellaneous Information

0x0C

0xCA

Digital Mix/Attenuation

0x0D

0x00

Upper Base Count

0x0E

0x00

Lower Base Count

0x0F

0x00

Alternate Feature Enable/Left

MIC Input Control

0x10

0x80

MIC Mix Enable/Right MIC

Input Control

0x11

0x00

Left Line Gain, Attenuate,

Mute, Mix

0x12

0x9F

Right Line Gain, Attenuate,

Mute, Mix

0x13

0x9F

Lower Timer

0x14

0x00

Upper Timer

0x15

0x00

Upper Frequency Select

0x16

0x2A

Lower Frequency Select

0x17

0xF8

External Status

0x18

0x30

Revision ID

0x19

0x80

Mono Control

0x1A

0xC0

Power-Down Control

0x1B

0x08

Capture Data Format Control

0x1C

0x50

Total Power-Down

0x1D

0x00

Capture Upper Base Count

0x1E

0x00

Capture Lower Base Count

0x1F

0x00