NET2890 datasheet(7/73 Pages) ETC

7 / 73 page

Specification

NET2890 USB Interface Controller

____________________________________________________________________________________

NetChip Technology, Inc., 1999

335 Pioneer Way, Mountain View, California 94041

TEL (650) 526-1490

FAX (650) 526-1494

http://www.netchip.com

Rev 2.0, Draft 9, July 16, 1999

1. Highlights

1.1 Features

•

USB Specification Version 1.1 Compliant

•

Bridges between a Processor-Independent local bus and a USB bus

•

USB device bandwidth of up to 12Mb/sec

•

Four Configurable Endpoints, in addition to Endpoint 0

•

Each endpoint can be Isochronous, Bulk, or Interrupt, as well as In or Out

•

One 128 byte FIFO attached to each endpoint allows concurrency

•

Separate 16 byte FIFO for Control Endpoint 0

•

Supports local CPU or DMA data transfers

•

Automatic retry of failed packets

•

Diagnostic register allows forced USB errors

•

Atomic operation to set and clear status bits simplifies software

•

Simulated disconnect allows re-enumeration

•

Low power CMOS in 48 Pin Plastic QFP Package

•

3.3V operating voltage, 3.3V / 5.0 V dual-voltage I/O interface

•

Pin compatible with NET2888

1.2 Overview

The NET2890 USB Interface Controller allows control, isochronous, bulk and interrupt transfers

between a generic local bus and a Universal Serial Bus (USB). The NET2890 supports the

connection between a host computer and an intelligent peripheral such as a digital camera or

scanner.

The five main components of the NET2890 are the USB Bus Interface, the Local Bus Interface,

the Configuration Registers, the five endpoint FIFOs, and the Serial Interface Engine.

The USB Interface is responsible for the following functions:

•

Host to device Communication.

•

USB bit level protocol (Serial Interface Engine).

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Automatic retry of failed packets.

•

Up to four Isochronous, Bulk, or Interrupt endpoints, each with a 128 byte FIFO.

•

Configurable Control Endpoint 0 with a 16 byte FIFO.

•

Interface to FIFOs and Local bus controller.

•

Simulated disconnect signaling

The Local Bus Interface is responsible for the following functions:

•

FIFO Control.

•

Local CPU interface.

•

Local DMA controller interface.

•

Interrupts.

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