Table of Contents

Contents

Page

Data Sheet, Rev. 1

August 2004

USB Device Controller

USS-820FD

2

Agere Systems Inc.

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 ....................................................................................................................................................11

Special Firmware Action for Shared Register Bits ................................................................................................ 13

Register Reads with Side Effects.......................................................................................................................... 14

Register Descriptions ............................................................................................................................................ 15

Interrupts .................................................................................................................................................................40

Firmware Responsibilities for USB SETUP Commands..........................................................................................41

Other Firmware Responsibilities..............................................................................................................................42

Frame Timer Behavior.............................................................................................................................................42

Suspend and Resume Behavior..............................................................................................................................42

Hardware Suspend Detect .................................................................................................................................... 43

Firmware Suspend Initiate .................................................................................................................................... 43

Hardware Resume Detect/Initiate .........................................................................................................................44

Hardware Resume Sequence ............................................................................................................................... 44

Firmware Resume Sequence ............................................................................................................................... 44

Special Suspend Considerations for Bus-Powered Devices ................................................................................ 44

Application Notes.....................................................................................................................................................46

USB Application Support Contact Information.........................................................................................................46

Absolute Maximum Ratings.....................................................................................................................................46

Electrical Characteristics .........................................................................................................................................47

dc Characteristics ................................................................................................................................................. 47

Power Considerations ...........................................................................................................................................48

USB Transceiver Driver Characteristics ............................................................................................................... 48

Connection Requirements .................................................................................................................................... 49

USB Transceiver Connection ............................................................................................................................. 49

Oscillator Connection Requirements.................................................................................................................. 50

Outline Diagrams.....................................................................................................................................................51

48-Ball TFSBGAC (USS-820FD) .......................................................................................................................... 51

Ordering Information................................................................................................................................................51

Appendix A. Special Function Register Bit Names..................................................................................................52

Appendix B. USS-820FD Register Map ..................................................................................................................53

Appendix C. Changes from USS-820/USS-825 Revision B to C ............................................................................54

Appendix D. Changes from USS-820 Revision C to D............................................................................................55

Appendix E. Changes from USS-820 Revision D to FD..........................................................................................55