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详细说明： usb2.0的英文 spec Universal Serial Bus Specification Revision 2.0 ii Scope of this Revision The 2.0 revision of the specification is intended for product design. Every attempt has been made to ensure a consistent and implementable specification. Implementations should ensure compliance with this revision. Revision History Revision Issue Date Comments 0.7 November 11, 1994 Supersedes 0.6e. 0.8 December 30, 1994 Revisions to Chapters 3-8, 10, and 11. Added appendixes. 0.9 April 13, 1995 Revisions to all the chapters. 0.99 August 25, 1995 Revisions to all the chapters. 1.0 FDR November 13, 1995 Revisions to Chapters 1, 2, 5-11. 1.0 January 15, 1996 Edits to Chapters 5, 6, 7, 8, 9, 10, and 11 for consistency. 1.1 September 23, 1998 Updates to all chapters to fix problems identified. 2.0 (draft 0.79) October 5, 1999 Revisions to chapters 5, 7, 8, 9, 11 to add high speed. 2.0 (draft 0.9) December 21, 1999 Revisions to all chapters to add high speed. 2.0 April 27, 2000 Revisions for high-speed mode. ...展开收缩
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