Product manual

5.5 FIRMWARE FEATURES ..................................................................................................................... 21
5.5.1 Read Caching ................................................................................................................. 21
5.5.2 Write Caching ................................................................................................................. 22
5.5.3 Defect Management ........................................................................................................ 22
5.5.4 Automatic Defect Allocation ........................................................................................... 22
5.5.5 Multi Parities Error Correction ..................................................................................... 22
CHAPTER 6 USB INTERFACE AND USB COMMANDS ............................................................ 23
6.1 INTRODUCTION ................................................................................................................................ 23
6.2 PHYSICAL INTERFACE ..................................................................................................................... 23
6.2.1 Mechanical Interface ...................................................................................................... 23
6.2.1.1 Mechanical Overview ................................................................................................................... 23
6.2.1.2 Connector ...................................................................................................................................... 24
6.2.1.2.1 USB Connector Termination Data................................................................................................................... 24
6.2.1.2.2 Series “A” and Series “B” Receptacles ........................................................................................................ 25
6.2.1.2.3 Series “A” and Series “B” Plugs ................................................................................................................... 26
6.2.1.3 Cable................................................................................................................................................. 27
6.2.1.4 Cable Assembly.................................................................................................................................. 27
6.2.1.4.1 Standard Detachable Cable Assemblies .................................................................................................... 27
6.2.1.4.2 High-/full-speed Captive Cable Assemblies............................................................................................... 30
6.2.1.4.3 Low-speed Captive Cable Assemblies ........................................................................................................ 31
6.2.1.4.4 Prohibited Cable Assemblies ...................................................................................................................... 31
6.2.2 Electrical Interface .......................................................................................................... 32
6.2.2.1 Electrical Overview ............................................................................................................................ 32
6.2.2.2 Signaling ............................................................................................................................................ 33
6.2.2.3 High-speed (480Mb/s) Driver Characteristics ................................................................................... 34
6.2.2.4 High-speed (480Mb/s) Signaling Rise and Fall Times ...................................................................... 35
6.2.2.5 High-speed (480Mb/s) Receiver Characteristics ............................................................................... 35
6.2.2.6 High-speed (480Mb/s) Signaling Levels ........................................................................................... 36
6.2.3 Power Distribution ......................................................................................................... 37
6.2.3.1 Overview .............................................................................................................................................. 37
6.2.3.2 Bus-powered Hubs ............................................................................................................................... 37
6.2.3.3 Self-powered Hubs .............................................................................................................................. 38
6.3 PROTOCOL LAYER ............................................................................................................................ 39
6.3.1 Protocol Layer Overview................................................................................................ 39
6.3.2 Common USB Packet Fields ........................................................................................... 40
6.3.2.1 SYNC Fields...................................................................................................................................... 40
6.3.2.2 Packet Identifier Fields...................................................................................................................... 40
6.3.2.3 Address Fields .................................................................................................................................. 41
6.3.2.4 Endpoint Fields.................................................................................................................................. 42
6.3.2.5 Frame Number Fields ....................................................................................................................... 42
6.3.2.6 Data Fields ........................................................................................................................................ 42
6.3.2.7 Cyclic Redundancy Checks .............................................................................................................. 42
6.3.3 Packet Format ................................................................................................................. 43
6.3.3.1 Token Packet..................................................................................................................................... 43
6.3.3.2 Data Packet ....................................................................................................................................... 43
6.3.3.3 Handshake Packet ............................................................................................................................. 43
6.3.3.4 Start-of-Frame Packets...................................................................................................................... 44
6.3.4 Pipes ................................................................................................................................ 44
6.3.5 Transfer/Endpoint Types ................................................................................................. 45
6.3.5.1 Control Transaction........................................................................................................................... 46
6.3.5.2 Bulk Transaction................................................................................................................................ 48
6.3.6 USB Device Generic Framework .................................................................................... 50
6.3.6.1 USB Device State ............................................................................................................................. 50
6.3.6.1.1 Attached .................................................................................................................................................. 51
6.3.6.1.2 Powered ................................................................................................................................................... 51
6.3.6.1.3 Default ..................................................................................................................................................... 52
6.3.6.1.4 Address ..................................................................................................................................................... 52
6.3.6.1.5 Configured ................................................................................................................................................ 52
6.3.6.1.6 Suspended ................................................................................................................................................ 52
6.3.6.1.7 Bus Enumeration ..................................................................................................................................... 52
6.3.6.2 Generic USB Device Operation...................................................................................................... 53
6.3.6.2.1 Dynamic Attachment and Removal ......................................................................................................... 53
6.3.6.2.2 Address Assignment ................................................................................................................................. 53
6.3.6.2.3 Configuration............................................................................................................................................ 54
6.3.6.2.4 Data Transfer ........................................................................................................................................... 54
6.3.6.2.5 Power Management .................................................................................................................................. 54
6.3.6.2.6 Request Processing ................................................................................................................................... 54