4 EZ-USB® Technical Reference Manual, Document # 001-13670 Rev. *A
Contents
2. Endpoint Zero 37
2.1 Introduction.............................................................................................................................37
2.2 Control Endpoint EP0.............................................................................................................37
2.3 USB Requests........................................................................................................................40
2.3.1 Get Status................................................................................................................41
2.3.2 Set Feature..............................................................................................................43
2.3.3 Clear Feature...........................................................................................................44
2.3.4 Get Descriptor..........................................................................................................45
2.3.4.1 Get Descriptor-Device.................................................................................47
2.3.4.2 Get Descriptor-Device Qualifier...................................................................48
2.3.4.3 Get Descriptor-Configuration.......................................................................48
2.3.4.4 Get Descriptor-String...................................................................................48
2.3.4.5 Get Descriptor-Other Speed Configuration ................................................49
2.3.5 Set Descriptor..........................................................................................................49
2.3.5.1 Set Configuration ........................................................................................51
2.3.6 Get Configuration.....................................................................................................51
2.3.7 Set Interface ............................................................................................................51
2.3.8 Get Interface............................................................................................................52
2.3.9 Set Address .............................................................................................................52
2.3.10 Sync Frame .............................................................................................................53
2.3.11 Firmware Load.........................................................................................................53
3. Enumeration and ReNumeration™ 55
3.1 Introduction.............................................................................................................................55
3.2 EZ-USB Startup Modes..........................................................................................................55
3.3 The Default USB Device.........................................................................................................56
3.4 EEPROM Boot-load Data Formats.........................................................................................57
3.4.1 No EEPROM or Invalid EEPROM ...........................................................................57
3.4.2 Serial EEPROM Present, First Byte is 0xC0 ..........................................................58
3.4.3 Serial EEPROM Present, First Byte is 0xC2 ...........................................................59
3.5 EEPROM Configuration Byte .................................................................................................60
3.6 The RENUM Bit......................................................................................................................61
3.7 EZ-USB Response to Device Requests (RENUM=0) ............................................................61
3.8 EZ-USB Vendor Request for Firmware Load .........................................................................62
3.9 How the Firmware ReNumerates ...........................................................................................63
3.10 Multiple ReNumerations™......................................................................................................63
4. Interrupts 65
4.1 Introduction.............................................................................................................................65
4.2 SFRs.......................................................................................................................................65
4.2.1 803x/805x Compatibility...........................................................................................68
4.3 Interrupt Processing ...............................................................................................................68
4.3.1 Interrupt Masking.....................................................................................................68
4.3.1.1 Interrupt Priorities........................................................................................69
4.3.2 Interrupt Sampling ...................................................................................................69
4.3.3 Interrupt Latency......................................................................................................70
4.4 USB-Specific Interrupts ..........................................................................................................70
4.4.1 Resume Interrupt.....................................................................................................70
4.4.2 USB Interrupts .........................................................................................................70
4.4.2.1 SUTOK, SUDAV Interrupts .........................................................................74
4.4.2.2 SOF Interrupt...............................................................................................74
4.4.2.3 Suspend Interrupt........................................................................................74
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