Lucent Technologies Table of Contents, USS-720 Instant USB, Preliminary Data Sheet, Rev, Page

USS-720Instant USB	Preliminary Data Sheet, Rev. 5
USB-to-IEEE1284 Bridge	September 1999

Table of Contents

Contents	Page	Contents	Page
Features	5-1	Register-Based Operation	5-14
Description	5-1	Standard Mode (000)	5-14
Pin Information	5-3	Bidirectional Mode (001)	5-14
Overview	5-5	Compatibility Mode (010)	5-14
USB Port	5-5	ECP Mode (011)	5-14
Device Descriptor, Configurations, and		EPP Mode (100)	5-14
Interfaces	5-5	Registers	5-15
Supported Descriptors	5-5	Data Register	5-16
Descriptor Locations	5-5	Status Register	5-16
Onboard Device Descriptor	5-6	Control Register	5-17
Configuration Descriptor	5-7	EPP Address Register	5-18
Interface Descriptors	5-8	EPP Data Register	5-18
Interface 0, Alternate Setting 0		ECP Command Register	5-19
(I0:A0)	5- 8	Extended Control Register	5-20
Interface 0, Alternate Setting 1		USS-720 Control Register	5-21
(I0:A1)	5-9	USS-720 Setup Register	5-22
Interface 0, Alternate Setting 2		Interrupts	5-23
(I0:A2)	5-10	nAck Interrupt	5-23
Pipes	5-11	EPP Time-Out Interrupt	5-23
Control Pipe	5-11	nFault Interrupt	5-23
Bulk In Pipe	5-11	Bulk In Interrupt	5-23
Bulk Out Pipe	5-11	Bulk Out Interrupt	5-23
Interrupt Pipe	5-11	Change Interrupt	5-23
Interpipe Synchronization	5-11	Disconnect Interrupt	5-23
Requests	5-11	External Circuitry Requirements	5-24
Standard Requests	5-11	Filter Bypass Mode	5-25
Printer Class-Specific Requests	5-12	High Drive Mode	5-25
GET_DEVICE_ID	5-12	Self-Powered Mode	5-25
GET_PORT_STATUS	5-12	Absolute Maximum Ratings	5-25
SOFT_RESET	5-12	Electrical Characteristics	5-26
Vendor-Specific Requests	5-13	Timing Characteristics	5-27
GET_1284_REGISTER	5-13	Outline Diagram	5-28
SET_1284_REGISTER	5-13	44-Pin MQFP	5-28
IEEE 1284 Port	5-14	Ordering Information	5-28

5-2 Lucent Technologies Inc.