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USS-820D Datasheet PDF : 58 Pages
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USS-820D
USB Device Controller
Data Sheet, Rev. 4
June 2001
Table of Contents
Contents
Page
Features ....................................................................................................................................................................1
New Features After Revision B .................................................................................................................................1
Applications ...............................................................................................................................................................1
Description................................................................................................................................................................. 3
Serial Interface Engine............................................................................................................................................ 3
Protocol Layer ......................................................................................................................................................... 4
FIFO Control ........................................................................................................................................................... 4
FIFO Programmability .............................................................................................................................................4
FIFO Access ........................................................................................................................................................... 4
Transmit FIFO ...................................................................................................................................................... 5
Receive FIFO ....................................................................................................................................................... 6
Pin Information .........................................................................................................................................................7
Register Timing Characteristics.................................................................................................................................9
Register Interface ....................................................................................................................................................12
Special Firmware Action for Shared Register Bits ................................................................................................14
Register Reads with Side Effects..........................................................................................................................15
Register Descriptions ............................................................................................................................................16
Interrupts .................................................................................................................................................................41
Firmware Responsibilities for USB SETUP Commands..........................................................................................42
Other Firmware Responsibilities..............................................................................................................................43
Frame Timer Behavior.............................................................................................................................................43
Suspend and Resume Behavior..............................................................................................................................43
Hardware Suspend Detect....................................................................................................................................44
Firmware Suspend Initiate ....................................................................................................................................44
Hardware Resume Detect/Initiate .........................................................................................................................45
Hardware Resume Sequence ...............................................................................................................................45
Firmware Resume Sequence ...............................................................................................................................45
Special Suspend Considerations for Bus-Powered Devices ................................................................................45
Application Notes.....................................................................................................................................................47
Absolute Maximum Ratings.....................................................................................................................................47
Electrical Characteristics .........................................................................................................................................48
dc Characteristics .................................................................................................................................................48
Power Considerations ........................................................................................................................................49
USB Transceiver Driver Characteristics ...............................................................................................................49
Connection Requirements ....................................................................................................................................50
USB Transceiver Connection .............................................................................................................................50
Oscillator Connection Requirements..................................................................................................................51
Outline Diagrams.....................................................................................................................................................52
44-Pin MQFP (USS-820D)....................................................................................................................................52
48-Pin TQFP (USS-820TD) ..................................................................................................................................53
Ordering Information................................................................................................................................................53
Appendix A. Special Function Register Bit Names..................................................................................................54
Appendix B. USS-820D Register Map.....................................................................................................................55
Appendix C. Changes from USS-820/USS-825 Revision B to C ............................................................................56
Appendix D. Changes from USS-820/USS-820T Revision C to D ..........................................................................57
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