Uss-720 instant usb™ usb-to-ieee* 1284 bridge, Features, Description – Lucent Technologies USS-720 User Manual

Page 27: Figure 1 . block diagram, Instant usb, Ieee, Uss-720, Usb-to, 1284 bridge

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Preliminary Data Sheet, Rev. 5
September 1999

13

Lucent Technolgies Inc.

5-1

USS-720

Instant USB

USB-to-

IEEE

* 1284 Bridge

Features

Device Features:

Full compliance with the

Universal Serial Bus Specifi-

cation Revision 1.0

On-chip transceivers for USB

Low power consumption allows part to be powered
from USB connection

Dual on-chip USB packet buffers for fast response

Fully compatible USB host device drivers available

Fully compliant with USB printer device class specifi-
cation

Implemented in Lucent Technologies Microelectron-
ics Group’s 0.35

µ

m, 3 V standard-cell library

Complete single-chip solution in a 44-pin MQFP

Evaluation kit available

IEEE 1284 (Parallel) Features:

Transparent, fully automatic support for true bidirec-
tional communication

Hardware initiates and manages automatic negotia-
tion for the fastest protocol available

Supports standard PC parallel port register-based
operation

Support of multiple logical channels

Maximum throughput: 1.216 Mbytes/s (ECP mode)

Description

The USS-720 integrated circuit connects an

IEEE

1284

parallel port peripheral to the universal serial bus (USB).
It is designed to be a low-cost, single-chip embedded
solution requiring minimal external components. It is
suitable for a wide range of applications, from integrated
applications where the IC is mounted on a printed-
circuit board inside a product, to stand-alone applica-
tions where the chip provides a standard parallel port to
a USB-capable computer. The USS-720 software
included in the Evaluation Kit allows peripheral vendors
to evaluate and test the USS-720 device, which is
embedded in the

Centronics

end of a USB-to-parallel

port cable provided with the kit. This solution requires
no firmware changes on the parallel port peripheral.

* IEEE is a registered trademark of The Institute of Electrical and

Electronics Engineers, Inc.

Centronics is aregistered trademark of Centronics Data Com-

puter Corporation.

5-5109a.r6

Figure 1. Block Diagram

USS-720

IEEE

1284

PARALLEL

PORT

IEEE

1284

HOST

CONTROL

AND INTERFACE

LOGIC

NONVOLATILE

CONFIGURATION

SELECT LOGIC

USB

XCVR

UDC

CORE

USB

PORT

BUFFER

RAM

PERIPHERAL

IEEE

1284

BUFFERS

OSCILLATOR

PLL

EEPROM

INTERFACE

EXTERNAL SERIAL EEPROM

Note: Advisories are issued as needed to update product information. When using this data sheet for design purposes, please contact

your Lucent Technologies Microelectronics Group Account Manager to obtain the latest advisory on this product.

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