AD1812

REV. 0

–14–

Table VIII. Windows Sound System, Logical Device Number = 0

Register Name Address Type

Description Value

Activate

0x30

Read/Write Activates device.

I/O Range Check 0x31

Read/Write Performs conflict check

on selected I/O range.

I/O Port Base

0x60

Read/Write I/O Base [15:8].

Address

0x61

Read/Write I/O Base [7:0].

IRQ Level Select 0x70

Read/Write Selects interrupt level.

IRQ Type Select 0x71

Read-Only

Active HI, level-sensitive

(not user programmable).

DMA Select 0

0x74

Read/Write Indicates DMA capture

channel.

DMA Select 1

0x75

Read/Write Indicates DMA playback

channel. (If DMA 0 is

not used, capture and

playback occurs on

DMA 1.)

Table IX. Game Registers, Logical Device Number = 1

Address

Register Name

Value

Type

Description

Activate

0x30

Read/Write

Activates device.

I/O Range Check 0x31

Read/Write

Performs conflict check

on selected I/O range.

I/O Port Base

0x60

Read/Write

I/O Base [9:8].

Address

0x61

Read/Write

I/O Base [7:0].

IRQ Level Select 0x70

Read/Write

Selects interrupt level.

IRQ Type Select

0x71

Read-Only

Active HI, edge-sensitive

(not user programmable).

DMA Select 0

0x74

Read/Write

Indicates which 8-bit

DMA channel.

Table X. Music Synthesizer, Logical Device Number = 2

Address

Register Name

Value

Type

Description

Activate

0x30

Read/Write

Activates device.

I/O Range Check 0x31

Read/Write

Performs conflict check

on selected I/O range.

I/O Port Base

0x60

Read/Write

I/O Base [9:8].

Address

0x61

Read/Write

I/O Base [7:0].

Table XI. MIDI Port, Logical Device Number = 3

Address

Register Name

Value

Type

Description

Activate

0x30

Read/Write

Activates device.

I/O Range Check 0x31

Read/Write

Performs conflict check

on selected I/O range.

I/O Port Base

0x60

Read/Write

I/O Base [9:8].

Address

0x61

Read/Write

I/O Base [7:0].

IRQ Level Select 0x70

Read/Write

Selects interrupt level.

IRQ Type Select 0x71

Read-Only

Active HI, edge-sensi-

tive (not user program-

mable).

Table XII. Game Port, Logical Device Number = 4

Address

Register Name

Value

Type

Description

Activate

0x30

Read/Write

Activates device.

I/O Range Check 0x31

Read/Write

Performs conflict check

on selected I/O range.

I/O Port Base

0x60

Read/Write

I/O Base [9:8].

Address

0x61

Read/Write

I/O Base [7:0].

Table XIII. Modem, Logical Device Number = 5

Address

Register Name

Value

Type

Description

Activate

0x30

Read/Write Activates device.

I/O Range Check 0x31

Read/Write Performs conflict check

on selected I/O range.

I/O Port Base

0x60

Read/Write I/O Base [9:8].

Address

0x61

Read/Write I/O Base [7:0].

IRQ Level Select 0x70

Read/Write Selects interrupt level.

IRQ Type Select 0x71

Read Only

Active HI, edge-sensitive

(not user programmable).

Power-Down Control

The AD1812 contains two levels of Power-Down control. One

level of control is accessed through the embedded codec registers

and another is accessed via the PnP vendor defined registers.

The codec registers allow sections of the embedded codec to be

turned off to conserve power.