xxvi
is used for user input that you type just as it appears; it is also used for
commands, options and arguments to commands, and names of
programs, directories and files.
italic
is used for names of variables to which you assign values. Italic is also
used for comments in screen displays and examples, and to introduce
new terms.
courier
is used for system output (for example, screen displays, reports),
examples, and system prompts.
<Enter>, <Return> or <CR>
<CR> represents the carriage return or Enter key.
CTRL
represents the Control key. Execute control c har acter s by press ing t he
Ctrl key and the letter simultaneously, for example, Ctrl-d.
Terminology
A character precedes a data or address parameter to specify the numeric
format, as follows (if not specified, the format is hexadecimal):
An asterisk (*) following a signal name for sig nals that are level significant
denotes that the signal is true or valid when the signal is low.
An asterisk (*) following a signal name for sig nals that are edge significant
denotes that the actions initiated by that signal occur on high to low
transition.
0x Specifies a hexadecimal number
% Specifies a binary number
& Specifies a decimal number