AT43USB370 datasheet(40/50 Pages) ATMEL

40 / 50 page

AT43USB370

3340B–USB–12/03

Descriptor Management

The HSICD gathers the USB descriptors from the USB devices and reports back to system

processor through API function calls.

USB Host System

Library

The USB host system library is comprised of the AT43USB370 host system interface APIs and

the underlying software library. All application-level system software communicates with the

AT43USB370 through this library.

AT43USB370 USB Host

System Library and

APIs

The USB host system library provides access to the AT43USB370 USB host functionality by

the system processor.

The corresponding host system interface API set encapsulates the

complete USB functionality. It is ANSI C compliant and is used for all USB device drivers and

applications development. Refer to

AT43USB370 Software Development Guide for detailed

descriptions of the AT43USB370 APIs.

System Software

System software is application specific and resides in the system processor. It communicates

with the AT43USB370 through the AT43USB370 Host System Interface APIs directly or

through the standard or application specific USB device drivers built on top the AT43USB370

APIs.

Figure 14 shows the AT43USB370 host firmware architecture.

Figure 14. AT43USB370 Host Firmware Architecture

External System

Processor

System Interface

Controller

USB Controller

AT43USB370 Hardware

Host System

Interface Controller Driver

(HUSICD)

Host USB Controller Driver

(HUSBCD)

AT43USB370 Host System Interface APIs

System Application

Software

AT43USB370

Host System Library

AT43USB370 Datasheet(PDF) 40 Page - ATMEL Corporation

AT43USB370 Datasheet(HTML) 40 Page - ATMEL Corporation

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