RocketIO™ Transceiver User Guide www.xilinx.com 19
UG024 (v3.0) February 22, 2007
Conventions
R
Conventions
This document uses the following conventions. An example illustrates each typographical
and online convention.
Port and Attribute Names
Input and output ports of the RocketIO transceiver primitives are denoted in upper-case
letters. Attributes of the RocketIO transceiver are denoted in upper-case letters with
underscores. Trailing numbers in primitive names denote the byte width of the data path.
These values are preset and not modifiable. When assumed to be the same frequency,
RXUSRCLK and TXUSRCLK are referred to as USRCLK and can be used interchangeably.
This also holds true for RXUSRCLK2, TXUSRCLK2, and USRCLK2.
Comma Definition
A comma is a “K-character” used by the transceiver to align the serial data on a
byte/half-word boundary (depending on the protocol used), so that the serial data is
correctly decoded into parallel data.
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 that you
enter in a syntactical statement
ngdbuild design_name
Helvetica bold
Commands that you select
from a menu
File → Open
Keyboard shortcuts Ctrl+C
Italic font
Variables in a syntax
statement for which you must
supply values
ngdbuild design_name
References to other manuals
See the Development System
Reference Guide for more
information.
Emphasis in text
If a wire is drawn so that it
overlaps the pin of a symbol,
the two nets are not connected.
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}
Product Not Recommended for New Designs
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