CY7C65621/31

Document #: 001-52934 Rev. *C

Page 3 of 27

Contents

Introduction .........................................................................4

USB Serial Interface Engine ..........................................4

Hub Repeater ................................................................4

Transaction Translator ..................................................4

Applications ........................................................................4

Functional Overview ..........................................................4

System Initialization .......................................................4

Enumeration ..................................................................4

Downstream Ports .........................................................5

Upstream Port ...............................................................5

Power Switching ............................................................5

Overcurrent Detection ...................................................5

Port Indicators ...............................................................5

Pin Configuration ...............................................................7

Pin Description Table x ......................................................8

Default Descriptors ..........................................................10

Device Descriptor ........................................................10

Configuration Descriptor ..............................................10

Interface Descriptor .....................................................11

Endpoint Descriptor .....................................................11

Device Qualifier Descriptor ..........................................11

Hub Descriptor ............................................................12

Configuration Options .....................................................13

0xD0 Load ...................................................................13

0xD2 Load ...................................................................13

0xD4 Load ...................................................................14

Supported USB Requests ................................................ 17

Device Class Commands ............................................ 17

Hub Class Commands ................................................ 18

Upstream USB Connection .............................................. 20

Downstream USB Connections ....................................... 20

LED Connections .............................................................. 20

System Block Diagram ..................................................... 21

Electrical Characteristics ................................................. 22

Absolute Maximum Ratings ......................................... 22

Operating Conditions ................................................... 22

DC Electrical Characteristics ....................................... 22

USB Transceiver ......................................................... 22

AC Electrical Characteristics ....................................... 22

Ordering Information ........................................................ 23

Ordering Code Defintions ............................................ 23

Package Diagram .............................................................. 24

Acronyms .......................................................................... 25

Document Conventions ................................................... 25

Units of Measure ......................................................... 25

ocument History Page ...................................................... 26

Sales, Solutions, and Legal Information ........................ 27

Worldwide Sales and Design Support ......................... 27

Products ...................................................................... 27

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