Oki JOB60851 user manual Specification Documents, Core Specifications

Chapter 4 Software Development

4-1-2. Specification Documents

USB specifications have been established by the USB Implementers Forum. These and other materials are available on the World Wide Web at the following URLs.

Forum top page	http://www.usb.org/developers/
Developers section	http://www.usb.org/developers/
Developer documentation	http://www.usb.org/developers/docs.html
Device classes	http://www.usb.org/developers/devclass.html
Compliance testing	http://www.usb.org/developers/complian.html

The USB Implementers Forum augments the core specifications, the document specifying characteristics shared by all USB devices, with separate Universal Serial Bus Device Class Specifications for specific device types.

4-1-3. Core Specifications

This document covers common characteristics of host controllers, hubs, devices, and transmission pathways. Specific areas include an overview of USB communications, functionality, and bus drivers; physical and electrical specifications for connectors, transmission pathways, and other components; and the standard command-response device requests that all USB devices must support. The current version number is 1.1.1

n Note n

Note: Version 1.1 superseded version 1.0 in October 1998. The older version is still available on the World Wide Web. Apart from such additions as InterruptOut transfers, most changes involve removing ambiguities in the older version. The electrical specifications in Chapter 7 now provide more detail. The protocol layer specifications in Chapter 8 add descriptions of STALL operation for the default control pipe and of the Data stage of control transfers. The device framework specifications in Chapter 9 add descriptions of state processing for request errors. The hub specifications in Chapter 11 have been completely rewritten.

Chapter 1	Introduction	Objectives and target audience for USB specifications
Chapter 2	Terms and	Definitions of key terms used
	Abbreviations
Chapter 3	Background	Design goals and requirements addressed
Chapter 4	Architectural Overview	Overview of USB architecture and key concepts
Chapter 8	Protocol Layer	Packet definitions and detailed descriptions of
		transaction formats for error detection and recovery,
		etc.
Chapter 9	UBS Device Framework	Detailed descriptions of device states, device requests,

1Version 1.1 superseded version 1.0 in October 1998. The older version is still available on the World Wide Web. Apart from such additions as InterruptOut transfers, most changes involve removing ambiguities in the older version. The electrical specifications in Chapter 7 now provide more detail. The protocol layer specifications in Chapter 8 add descriptions of STALL operation for the default control pipe and of the Data stage of control transfers. The device framework specifications in Chapter 9 add descriptions of state processing for request errors. The hub specifications in Chapter 11 have been completely rewritten.

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