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Creative SB0350 Hardware Programming Guide - Page 8

Creative SB0350 Manual

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Introduction This manual covers the hardware programming information for the following Sound Blaster cards: „ Sound Blaster Version 1.5 or earlier (SB1.5) TM „ Sound Blaster for Micro Channel Version (SBMCV) TM „ Sound Blaster Version 2.0 (SB2.0) TM „ Sound Blaster 2.0 CD Interface (SB2CD) TM „ Sound Blaster Pro (SBPRO) TM „ Sound Blaster Pro for Micro Channel Version (SBPRO MCV) TM „ Sound Blaster 16 (SB16) TM „ Sound Blaster 16 with Advanced Signal Processing TM TM This manual documents the programming interface to the main Creative-specific Sound Blaster hardware components; namely the Digital Sound Processor (DSP), Mixer chip, and MIDI Port. The Digital Sound Processor handles digitized sound recording and playback. It supports 8- or 16-bit digitized sound. Digitized sound I/O can be carried out in mono or stereo, using Single-cycle or Auto-initialize DMA modes. The Digital Sound Processor also supports real-time decompression of ADPCM in three compressed formats: 8 to 4 bits, 8 to 3 bits, and 8 to 2 bits. The Mixer chip provides volume control of various input and output sources. It also controls the selection of the recording source. The MIDI Port on Sound Blaster cards conform to the International MIDI Association specifications. Through this port, MIDI messages can be transmitted to and received from external MIDI devices.

Section	Page
Introduction	8
What You Should Know	9
Scope and Manual Organization	9
Document Conventions	10
Determining User's Sound Blaster Card	12
Determining User's Card Settings	13
Chapter 1 - Hardware Overview	14
Anatomy of Sound Blaster Family of Audio Cards	15
Digital Sound Processor Chip	15
Mixer Chip	16
FM Synthesizer Chip	16
Bus Interface Chip	17
Advanced Signal Processor Chip	17
Block Diagrams for Sound Blaster Family of Audio Cards	19
Chapter 2 - Introduction to DSP Programming	23
DSP I/O Addresses	24
Resetting DSP	24
Reading from DSP	25
Writing to DSP	26
Handling Interrupts from DSP	26
Sharing of Interrupts	27
Configuring DMA and Interrupt Settings	28
Chapter 3 - Digitized Sound I/O Programming	30
Digitized Sound Operation Modes	31
Digitized Sound Data Format	31
Digitized Sound I/O Transfer Rate	33
Direct Mode	33
Single-cycle DMA Mode	34
Auto-initialize DMA Mode	34
High-Speed DMA Mode	35
ADPCM DMA mode	36
DSP Digitized Sound I/O Capability	37
Digitized Sound Input Capability	39
Sample Procedures	40
General Procedures for a DMA mode Transfer	41
Handling the DSP Digitized Sound I/O Interrupt	41
Chapter 4 - Mixer Chip Programming	59
Programming Sequence	60
CT1335 Mixer	62
Features	62
Register Functions	62
CT1345 Mixer	64
Features	64
Register Functions	65
CT1745 Mixer	68
Features	68
Register Functions	69
Chapter 5 - MIDI Port I/O Programming	76
SB-MIDI Mode	77
I/O Addresses	77
Sending MIDI Data	78
Reading MIDI Data	79
MPU-401 UART Mode	80
I/O Addresses	80
Checking the Status	81
Sending a Command	82
Sending MIDI Data	85
Reading MIDI Data	85
Chapter 6 - DSP Commands	86
Commands by Category	87
Command Descriptions	90
Appendix A - Sound Blaster I/O Address Maps	115
SB1.5 I/O Address Map	116
SBMCV I/O Address Map	117
SB2.0 I/O Address Map	118
SB2CD I/O Address Map	119
SBPRO I/O Address Map	120
SBPRO MCV I/O Address Map	122
SB16 I/O Address Map	123
Appendix B - File Format	125
Creative Voice File (VOC) Format	126
Header Block	126
Data Block	127
Creative ADPCM Wave Type Format	136
Appendix C - Relevant Information	137