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AD1816A

–23–

REV. A

Table IV. Internal Logical Device Configuration

LDN

PnP Function

Description

I/O Port Address Descriptor (0x60-0x61)

The SoundBlaster Pro address range is from 0x100 to 0x3F0. The typi-

cal address is 0x220. The range is 16 bytes long and must be aligned to

a 16 byte memory boundary.

I/O Port Address Descriptor (0x62-0x63)

The AdLib address range is from 0x100 to 0x3F8. The typical address

is 0x388. The range is 4 bytes long and must be aligned to an 8 byte

memory boundary.

I/O Port Address Descriptor (0x64-0x65)

The Codec address range is from 0x100 to 0x3F8. The range is

16 bytes long and must be aligned to a 16 byte memory boundary.

Interrupt Request Level Select (0x70-0x71)

This IRQ is shared between the SB Pro device and the Codec. These

devices require one of the following IRQ channels: 5, 7, 9, 11, 12 or 15.

Typically, the IRQ is set to 5 or 7 for this device.

DMA Playback Channel Select (0x74)

This 8-bit channel is shared between the SB Pro device and the Codec

for playback. These devices require one of the following DMA chan-

nels: 0, 1, 3. Typically, DMA channel 1 is set.

DMA Capture Channel Select (0x75)

This the DMA channel used for capturing Codec data. The Codec op-

erates in single channel mode if a separate DMA channel for capture

and playback is not assigned. The following DMA channels may be

programmed: 0, 1, 3. DMA Channel 4 indicates single channel mode.

I/O Port Address Descriptor (0x60-0x61)

The MPU-401 compatible device address range is 0x100 to 0x3FE.

Typical configurations use 0x330. The range is 2 bytes long and must

be aligned to a 2 byte memory boundary.

Interrupt Request Level Select (0x70-0x71)

The MIDI device requires one of the following IRQ channels: 5, 7, 9,

11, 12 or 15.

I/O Port Address Descriptor (0x60-0x61)

The Game Port address range is from 0x100 to 0x3F8. The typical

address is 0x200. The range is 8 bytes long and must be aligned to an

8 byte memory boundary.

NOTE

DMA channel 4 indicates single-channel mode.

Sound System Direct Registers

The AD1816A has a set of 16 programmable Sound System Direct Registers and 36 Indirect Registers. This section describes all the

AD1816A registers and gives their address, name and initialization state/reset value. Following each register table is a list (in ascend-

ing order) of the full register name, its usage and its type: (RO) Read Only, (WO) Write Only, (STKY) Sticky, (RW) Read Write and

Reserved (res). Table V is a map of the AD1816A direct registers.

Table V. Sound System Direct Registers

Direct

Address

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

SSBASE + 0

CRDY

VBL

INADR[5:0]

SSBASE + 1

SSBASE + 2

Indirect SS Data [7:0]

SSBASE + 3

Indirect SS Data [15:8]

SSBASE + 4

RES

PUR

COR

ORR [1:0]

ORL [1:0]

SSBASE + 5

PFH

PDR

PLR

PUL

CFH

CDR

CLR

CUL

SSBASE + 6

PIO Playback/Capture [7:0]

SSBASE + 7

RESERVED

SSBASE + 8

TRD

DAZ

PFMT [1:0]

PC/L

PST

PIO

PEN

SSBASE + 9

RES

CFMT [1:0]

CC/L

CST

CIO

CEN

SSBASE + 10

RESERVED

SSBASE + 11

RESERVED

SSBASE + 12

JOYSTICK DATA [7:0]

SSBASE + 13

JRDY

JWRP

JSEL [1:0]

JMSK [3:0]

SSBASE + 14

JAXIS [7:0]

SSBASE + 15

JAXIS [15:8]

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