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5-2 Lucent Technologies Inc.
USS-720
Instant USB
Preliminary Data Sheet, Rev. 5
USB-to-
IEEE
1284 Bridge September 1999
Features ................................................................. 5-1
Description .............................................................. 5-1
Pin Information ....................................................... 5-3
Overview ..................................................................5-5
USB Port ................................................................. 5-5
Device Descriptor, Configurations, and
Interfaces..........................................................5-5
Supported Descriptors .............................5-5
Descriptor Locations.........................................5-5
Onboard Device Descriptor ..............................5-6
Configuration Descriptor...................................5-7
Interface Descriptors.........................................5-8
Interface 0, Alternate Setting 0
(I0:A0) .....................................................5- 8
Interface 0, Alternate Setting 1
(I0:A1) ..................................................... 5-9
Interface 0, Alternate Setting 2
(I0:A2) ................................................... 5-10
Pipes...............................................................5-11
Control Pipe .......................................... 5-11
Bulk In Pipe ........................................... 5-11
Bulk Out Pipe ........................................ 5-11
Interrupt Pipe ........................................ 5-11
Interpipe Synchronization ..................... 5-11
Requests ........................................................5-11
Standard Requests.........................................5-11
Printer Class-Specific Requests .....................5-12
GET_DEVICE_ID .................................. 5-12
GET_PORT_STATUS ........................... 5-12
SOFT_RESET ...................................... 5-12
Vendor-Specific Requests ..............................5-13
GET_1284_REGISTER ........................ 5-13
SET_1284_REGISTER ......................... 5-13
IEEE
1284 Port ..................................................... 5-14
Register-Based Operation ............................. 5-14
Standard Mode (000) ........................... 5-14
Bidirectional Mode (001) ...................... 5-14
Compatibility Mode (010) ..................... 5-14
ECP Mode (011) .................................. 5-14
EPP Mode (100) ................................... 5-14
Registers........................................................ 5-15
Data Register ....................................... 5-16
Status Register ..................................... 5-16
Control Register ................................... 5-17
EPP Address Register ......................... 5-18
EPP Data Register ............................... 5-18
ECP Command Register ..................... 5-19
Extended Control Register .................. 5-20
USS-720 Control Register .................... 5-21
USS-720 Setup Register ...................... 5-22
Interrupts........................................................ 5-23
nAck Interrupt ....................................... 5-23
EPP Time-Out Interrupt ........................ 5-23
nFault Interrupt ..................................... 5-23
Bulk In Interrupt .................................... 5-23
Bulk Out Interrupt ................................. 5-23
Change Interrupt .................................. 5-23
Disconnect Interrupt ............................. 5-23
External Circuitry Requirements .......................... 5-24
Filter Bypass Mode .............................................. 5-25
High Drive Mode .................................................. 5-25
Self-Powered Mode ............................................. 5-25
Absolute Maximum Ratings ................................. 5-25
Electrical Characteristics ..................................... 5-26
Timing Characteristics ......................................... 5-27
Outline Diagram .................................................... 5-28
44-Pin MQFP................................................. 5-28
Ordering Information ............................................. 5-28