R

Command Line Options

•To insert certain command options and file names within the command line, as in the following example:

par -f placeoptions -s 4 -f routeoptions design_i.ncd design_o.ncd placeoptions is the name of a file containing placement command parameters. routeoptions is the name of a file containing routing command parameters.

You create the command file in ASCII format. Use the following rules when creating the command file:

•Separate program options and file names with spaces.

•Precede comments with the pound sign (#).

•Put new lines or tabs anywhere white space is allowed on the UNIX or DOS command line.

•Put all arguments on the same line, one argument per line, or a combination of these.

•All carriage returns and other non-printable characters are treated as spaces and ignored.

•No line length limitation exists within the file.

Following is an example of a command file:

#command line options for par for design mine.ncd -n 10

-w

0l 5

-s 2 #will save the two best results /home/yourname/designs/xilinx/mine.ncd #directory for output designs /home/yourname/designs/xilinx/output.dir #use timing constraints file /home/yourname/designs/xilinx/mine.pcf

–h (Help)

When you enter a program name followed by –helpor –h, a message displays that lists all the available options and their parameters as well as the file types for use with the program. The message also explains each of the options.

Following are descriptions for the symbols used in the help message:

Symbol

Description

[ ]

Encloses items that are optional.

{ }

Encloses items that may be repeated.

< >

Encloses a variable name or number for which you

 

must substitute information.

,Shows a range for an integer variable.

–Shows the start of an option name.

:Binds a variable name to a range.

Development System Reference Guide

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Xilinx 8.2i manual Help, Command Line Options, Symbol Description
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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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