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>;

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Development System Reference Guide

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Xilinx 8.2i manual Netlist Launcher Rules Files, User Rules File, User Rules and System Rules, User Rules Format
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8.2i specifications

Xilinx 8.2i is a significant version of the Xilinx ISE (Integrated Software Environment) that emerged in the early 2000s, marking an important milestone in the world of FPGA (Field-Programmable Gate Array) development. This version introduced a slew of advanced features, technologies, and characteristics that made it an indispensable tool for engineers and developers in designing, simulating, and implementing digital circuits.

One of the standout features of Xilinx 8.2i is its enhanced design entry capabilities. This version supports multiple design entry methods, including schematic entry, VHDL, and Verilog HDL, giving engineers the flexibility to choose their preferred approach. The integrated environment provides user-friendly graphical interfaces, making it accessible for both novice and experienced users.

Xilinx 8.2i's synthesis tools have been improved to enable more efficient design compilation and optimization. The new algorithms used in this version facilitate faster synthesis times while reducing power consumption and improving performance. Furthermore, it features support for advanced FPGA architectures, which allows for the implementation of more complex designs with greater efficiency.

The implementation tools in Xilinx 8.2i include advanced place and route capabilities, utilizing state-of-the-art algorithms for optimized resource usage. These tools enable designers to make better use of FPGA resources, ensuring that designs fit within the constraints of the target device while maximizing performance.

Another key characteristic of Xilinx 8.2i is its extensive support for various Xilinx devices such as the Spartan, Virtex, and CoolRunner series. This compatibility ensures that developers can leverage the powerful features of these FPGA families, including high-speed transceivers and DSP slices.

Xilinx 8.2i also places a strong emphasis on simulation and verification. The version integrates with various simulation tools, allowing for thorough testing of the designs before implementation. This reduces the risk of errors and ensures that the final product meets specifications.

In addition, this version includes support for design constraints, enabling engineers to specify timing, area, and other critical design parameters. By accommodating constraints, Xilinx 8.2i helps in achieving reliable and efficient designs tailored to project needs.

In summary, Xilinx 8.2i is a robust software development tool that enhances the design process for FPGAs. Its comprehensive features, including multiple design entry options, advanced synthesis and implementation tools, extensive device support, and strong simulation capabilities, make it a valuable resource for engineers and developers striving for innovation in digital design.
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