Uc User Constraints File, Ur Read User Rules File

NGDBuild Options

–uc (User Constraints File)

–uc ucf_file[.ucf]

The –uc option specifies a User Constraints File (UCF) for the Netlist Launcher to read. The UCF file contains timing and layout constraints that affect the way the logical design is implemented in the target device.

The user constraints file must have a .ucf extension. If you specify a user constraints file without an extension, NGDBuild appends the .ucf extension to the file name. If you specify a file name with an extension other than .ucf, you get an error message and NGDBuild does not run.

If you do not enter a –uc option and a UCF file exists with the same base name as the input design file and a .ucf extension, NGDBuild automatically reads the constraints in this UCF file.

See the Constraints Guide for more information on the UCF file.

Note: NGDBuild only allows one UCF file as input. Therefore, you cannot specify multiple –uc options on the command line. Also, if you use this option, do not use the –i option.

–ur (Read User Rules File)

–urrules_file[.urf]

The –ur option specifies a user rules file for the Netlist Launcher to access. This file determines the acceptable netlist input files, the netlist readers that read these files, and the default netlist reader options. This file also allows you to specify third-party tool commands for processing designs.

The user rules file must have a .urf extension. If you specify a user rules file with no extension, NGDBuild appends the .urf extension to the file name. If you specify a file name with an extension other than .urf, you get an error message and NGDBuild does not run.

See “User Rules File” in Appendix B for more information.

–verbose (Report All Messages)

The –verbose option enhances NGDBuild screen output to include all messages output by the tools run: NGDBuild, the netlist launcher, and the netlist reader. This option is useful if you want to review details about the tools run.

Development System Reference Guide

www.xilinx.com

127

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.

Xilinx 8.2i manual Uc User Constraints File, Ur Read User Rules File, Verbose Report All Messages

Models: 8.2i