USB Device Class Definition for MIDI Devices, Version 2.0
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Table of Contents
1 Introduction ........................................................................................................................ 8
1.1 Background: MIDI 1.0, MIDI 2.0, and USB .................................................................. 8
1.2 Purpose ........................................................................................................................ 8
Figure 1: Simple USB MIDI Interface ............................................................................ 9
Figure 2: Simple USB MIDI Synthesizer ........................................................................ 9
1.3 Related Documents .................................................................................................... 10
1.4 Terms and Abbreviations ........................................................................................... 10
1.5 Reserved Words and Specification Conformance ..................................................... 11
Table 1-1: Words Relating to Specification Conformance........................................... 11
Table 1-2: Words Not Relating to Specification Conformance .................................... 11
2 Management Overview .................................................................................................... 12
2.1 Overview of what is new or changed from Version 1.0 class specification ............... 12
3 Functional Characteristics ............................................................................................. 14
3.1 Device and Topology .................................................................................................. 14
3.1.1 MIDI Streaming Interface with Two Alternate Settings: Backward Compatibility15
3.2 Data Format: Universal MIDI Packet (UMP) .............................................................. 15
3.2.1 Basic Packet Format ........................................................................................... 16
3.2.2 UMP Messages in a USB Packet: Byte Ordering ............................................... 17
3.2.3 UMP Message Type Field and Packet Size ....................................................... 17
Table 3-1: Packet Sizes based on Message Types .................................................... 17
3.2.4 UMP Group Field and Routing ............................................................................ 18
3.3 MIDI Streaming Interface ........................................................................................... 18
3.3.1 USB MIDI Converter ........................................................................................... 18
3.3.2 MIDI Streaming Data Endpoints ......................................................................... 18
3.3.3 Group Terminals and UMP Groups .................................................................... 19
3.3.4 Group Terminal Blocks........................................................................................ 19
4 Operational Model ........................................................................................................... 21
4.1 Communication from Host to USB MIDI Function ...................................................... 22
4.2 Communication from USB MIDI Function to Host ...................................................... 22
5 Configuration Descriptors .............................................................................................. 23
5.1 Core Descriptors......................................................................................................... 23
5.2 MIDIStreaming Interface Descriptors ......................................................................... 23
5.2.1 Standard MS Interface Descriptor....................................................................... 23
Table 5-1: Standard MIDIStreaming Interface Descriptor ........................................... 23
5.2.2 Class-Specific MS Interface Descriptor .............................................................. 24
Table 5-2: Class-Specific MS Interface Header Descriptor ......................................... 24
5.3 MIDI Streaming Endpoint Descriptors ........................................................................ 24
5.3.1 Standard MIDI Streaming Data Endpoint Descriptor .......................................... 24
Table 5-3: Standard MS Data Endpoint Descriptor ..................................................... 25
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