USB System Architecture

Documentation Conventions

This document contains conventions for numeric values as follows.

Hexadecimal Notation

This section defines the typographical convention used throughout this book. Hex Notation All hex numbers are followed by an “h.” Examples:

9A4Eh; 0100h

Binary Notation

All binary numbers are followed by a “b.” Examples:

0001 0101b; 01b

Decimal Notation

Numbers without any suffix are decimal. When required for clarity, decimal numbers are followed by a “d.” The following examples each represent a decimal number:

16; 255; 256d; 128d

Bits Versus Byte Notation

The Universal Serial Bus as its name implies transmits serial data, resulting in numerous discussions of bit-related issues. This book employs the standard notation for differentiating bits versus bytes as follows.

All abbreviations for “bits” use lower case. For example:

1.5Mb/s; 2Mb

All references to “bytes” are specified in upper case. For example:

10MB/s; 1KB

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