AD1816AJS datasheet(16/52 Pages) AD

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AD1816A

–16–

REV. A

EUPHONICS

EuSynth-1+

Virtually all applications developed for SoundBlaster, Windows

Sound System, AdLib and MIDI MPU-401 platforms run on the

AD1816A SoundPort Controller. Follow the same development

process for the controller as you would for these other devices.

As the AD1816A contains SoundBlaster (compatible) and

Windows Sound System logical devices. You may find the

following related development kits useful when developing

AD1816A applications.

Creative Labs, Inc., 1901 McCarthy Blvd., Milpitas, CA 95035

Microsoft Windows Sound System Driver Development Kit (CD),

Redmond, WA 98052

The following reference texts can serve as additional sources of in-

formation on developing applications that run on the AD1816A.

S. De Furia & J. Scacciaferro, The MIDI Implementation Book,

C. Petzold, Programming Windows: the Microsoft guide to writ-

Press, Redmond)

Indianapolis)

Rapids)

Kaufmann, Los Altos)

Roland Corp.)

Multimedia PC Capabilities

The AD1816A is MPC-2 and MPC-3 compliant. This compli-

ance is achieved through the AD1816A’s flexible mixer and the

embedded chip resources.

Music Synthesis

The AD1816A includes an embedded music synthesizer that

emulates industry standard OPL3 FM synthesizer chips and

delivers 20 voice polyphony. The internal synthesizer generates

digital music data at 22.05 kHz and is summed into the DACs

digital data stream prior to conversion. To sum synthesizer data

with the ADC output, the ADC must be programmed for a

22.05 kHz sample rate.

The synthesizer is a hardware

implementation of Eusynth-1+

code that was developed by

Euphonics, a research and devel-

opment company that specializes

in audio processing and electronic

music synthesis.

Wavetable MIDI Inputs

The AD1816A has a dedicated analog input for receiving an

analog wavetable synthesizer output. Alternatively, a wavetable

synthesizer’s I

2S formatted digital output can be directly con-

nected to one of the AD1816A’s I

2S serial ports. Digital wave-

table data from the AD1816A’s I

2S port may be summed with

other digital data streams being handled by the AD1816A and

then sent to the 16-bit

Σ∆ DAC.

MIDI

The primary interface for communicating MIDI data to and from

the host PC is the compatible MPU-401 interface that operates

only in UART mode. The MPU-401 interface has two built-in

FIFOs: a 64-byte receive FIFO and a 16-byte transmit FIFO.

Game Port

An IBM-compatible game port interface is provided on chip.

The game port supports up to two joysticks via a 15-pin D-sub

connector. Joystick registers supporting the Microsoft Direct

Input standard are included as part of the codec register map.

The AD1816A may be programmed to automatically sample the

game port and save the value in the Joystick Position Data Reg-

ister. When enabled, this feature saves up to 10% CPU MIPS

by off-loading the host from constantly polling the joystick port.

Volume Control

The registers that control the Master Volume output stage are

accessible through the ISA Bus. Master Volume output can also

be controlled through a 2-pin hardware interface. One pin is

used to increase the gain, the other pin attenuates the output

and both pins together entirely mute the output. Once muted, any

further activity on these pins will unmute the AD1816A’s output.

Plug and Play Configuration

The AD1816A is fully Plug and Play configurable. For mother-

board applications, the built-in Plug and Play protocol can be

disabled with a software key providing a back door for the BIOS

to configure the AD1816A’s logical devices. For information on

the Plug and Play mode configuration process, see the Plug and

Play ISA Specification Version 1.0a (May 5, 1994). All the

AD1816A’s logical devices comply with Plug and Play resource

definitions described in the specification.

The AD1816A may alternatively be configured using an optional

Plug and Play Resource ROM. When the EEPROM is present,

some additional AD1816A muxed-pin features become avail-

able. For example, pins that control an external modem logical

device are muxed with the DSP serial port. Some of these pin

option combinations are mutually exclusive (see Appendix A for

more information).

REFERENCES

The AD1816A also complies with the following related specifi-

cations; they can be used as an additional reference to AD1816A

operations beyond the material in this data sheet.

Intel Corp. & Microsoft Corp., One Microsoft Way,

Redmond, WA 98052

Marketing Council, 1730 M St. NW, Suite 707, Washington,

DC 20036

MIDI 1.0 Detailed Specification & Standard MIDI Files 1.0,

La Habra, CA 90632-3173

Recommendation G.711-Pulse Code Modulation (PCM) Of Voice

Frequencies (

µ-Law & A-Law Companding), The International

Telegraph and Telephone Consultative Committee IX Plenary

Assembly Blue Book, Volume III - Fascicle III.4, General

Aspects Of Digital Transmission Systems; Terminal

Equipment’s, Recommendations G.700 - G.795, (Geneva,

1988), ISBN 92-61-03341-5

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