Xilinx LOGICORE UG144 - Manual (Page 16)

16 www.xilinx.com 1-Gigabit Ethernet MAC v8.5 User Guide
UG144 April 24, 2009
Preface: About This Guide R
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Conventions
This document uses the following conventions. An example illustrates each convention.
Typographical
The following typographical conventions are used in this document:
Convention Meaning or Use Example
Courier font
Messages, prompts, and
program files that the system
displays
speed grade: - 100
Courier bold
Literal commands you enter in
a syntactical statement
ngdbuild design_name
Italic font
Variables in a syntax
statement for which you must
supply values See the Development System
Reference Guide for more
information.
References to other manuals See the User Guide for details.
Emphasis in text
If a wire is drawn so that it
overlaps the pin of a symbol,
the two nets are not connected.
Dark Shading
Items that are not supported
or reserved
This feature is not supported
Square brackets [ ]
An optional entry or
parameter. However, in bus
specifications, such as
bus[7:0]
, they are required.
ngdbuild [option_name]
design_name
Braces { }
A list of items from which you
must choose one or more
lowpwr ={on|off}
Vertical bar |
Separates items in a list of
choices
lowpwr ={on|off}
Vertical ellipsis
.
.
. Repetitive material that has
been omitted
IOB #1: Name = QOUT’
IOB #2: Name = CLKIN’
.
.
.
Horizontal ellipsis . . . Omitted repetitive material
allow block block_name
loc1 loc2 ... locn;
Notations
The prefix ‘0x’ or the suffix ‘h’
indicate hexadecimal notation
A read of address
0x00112975
returned
45524943 h.
An ‘_n’ means the signal is
active low
usr_teof_n is active low.