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388 www.xilinx.com Development System Reference Guide
Appendix :
R
Netlist Launcher Rules Files
The behavior of the Netlist Launcher is determined by rules defined in the system rules file
and the user rule file. These rules determine the following:
• What netlist source files are acceptable
• Which netlist reader reads each of these netlist files
• What the default options are for each netlist reader
The system rules file contains the default rules supplied with the Xilinx Development
System software. The user rules file can add to or override the system rules.
User Rules File
The user rules file can add to or override the rules in the system rules file. You can specify
the location of the user rules file with the NGDBuild –ur option. The user rules file must
have a .urf extension. See “–ur (Read User Rules File)” in Chapter 6 for more information.
User Rules and System Rules
User rules are treated as follows:
• A user rule can override a system rule if it specifies the same source and target files as
the system rule.
• A user rule can supplement a system rule if its target file is identical to a system rule’s
source file, or if its source file is the same as a system rule’s target file.
• A user rule that has a source file identical to a system rule’s target file and a target file
that is identical to the same system rule’s source file is illegal, because it defines a
loop.
User Rules Format
Each rule in the user rules file has the following format:
RuleName
= <rulename1>;
<
key1> = <value1>;
<
key2> = <value2>;
.
.
.
<
keyn> = <valuen>;