Chapter 23: XFLOW

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XFLOW Option Files

Option files contain the options for all programs run in a flow. These files have an .opt extension. Xilinx provides option files for each flow type, as described in the different sections of “XFLOW Flow Types”. You can also create your own option files.

Note: If you want to create your own option files, Xilinx recommends that you make a copy of an existing file, rename it, and then modify it.

Option File Format

Option files are in ASCII format. They contain program blocks that correspond to the programs listed in the flow files. Option file program blocks list the options to run for each program. Program options can be command line options or parameter files.

•Command Line Options

For information on the different command line options for each program, see the program-specific chapters of this guide, or from the command line type the program name followed by –h on the command line. Some options require that you specify a particular file or value.

•Parameter files

Parameter files specify parameters for a program. Parameters are written into the specified file. For example, Xilinx Synthesis Technology (XST) uses a script file to execute its command line options:

Program xst

-ifn <design>_xst.scr; -ofn <design>_xst.log; ParamFile: <design>_xst.scr

"run";

"-ifn <synthdesign>"; "-ifmt Verilog"; "-ofn <design>.ngc";

.

.

.

End ParamFile

End Program xst

Note: You can use variables for the file names listed in the Option Files. For example, if you specify <design>.vhd as an input file, XFLOW automatically reads the VHDL file in your working directory as the input file.

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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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