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Creative SB0350 Hardware Programming Guide - Page 99

Creative SB0350 Manual

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6-14 DSP Commands 38h Output Remarks 38h MIDI output Output MIDI data to the MIDI port in non-UART mode. The proper sequence is: 1. 2. Send command 38h. Send MIDI data. See Also Available command 30h, Polling mode MIDI input 1.xx 9 2.00 9 2.01+ 9 3.xx 9 4.xx 9 40h Output Remarks Set digitized sound transfer Time Constant 40h, bTimeConstant Set the digitized sound I/O transfer Time Constant. Time Constant is the sampling rate representation used by the DSP. It is calculated as: Time Constant = 65536 - (256 000 000/(channels * sampling rate)) The channels parameter is 1 for mono, 2 for stereo. Only the high byte of the result is sent to the DSP. See Also command 41h, Set digitized sound output sampling rate command 42h, Set digitized sound input sampling rate 1.xx 9 2.00 9 2.01+ 9 3.xx 9 4.xx 9 Available

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

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6-14

DSP Commands

38h

MIDI output

Output

38h

Remarks

Output MIDI data to the MIDI port in non-UART mode.

The proper sequence is:

Send command 38h.

Send MIDI data.