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Running XFLOW

Using the SCR, BAT, or TCL File

Every time you run XFLOW, it creates a script file that includes the command line commands of all the programs run. You can use this file for the following:

•Review this file to check which commands were run

•Execute this file instead of running XFLOW

By default, this file is named xflow_script.bat (PC) or xflow_script.scr (UNIX), although you can specify the output script file type by using the $scripts_to_generate option. To execute the script file, type xflow_script.bat, xflow_script.scr, or xflow_script.tcl at the command line.

If you choose to execute the script file instead of using XFLOW, the features of “Smart XFLOW” are not enabled. For example, XFLOW starts the flow at an appropriate point based on which files have changed, while the script file simply runs every command listed in the file. In addition, the script file does not provide error detection. For example, if an error is encountered during NGDBuild, XFLOW detects the error and terminates the flow, while the script file continues and runs MAP.

Using the XIL_XFLOW_PATH Environment Variable

This environment variable is useful for team-based design. By default, XFLOW looks for all flow and option files in your working directory. However, this variable allows you to store flow and option files in a central location and copy them to your team members’ local directories, ensuring consistency. To use this variable, do the following:

1.Modify the flow and option files as necessary.

2.Copy the flow and option files to the central directory, and provide your team members with the directory location.

3.Instruct your team members to type the following from their working directory: set XIL_XFLOW_PATH=name_of_central_directory

When the team member runs XFLOW, XFLOW copies all flow and option files from the central directory to his or her local directory.

Note: If you alter the files in the central directory and want to repopulate the users’ local directories, they must delete their local copies of the flow and option files, set the XIL_FLOW_PATH environment variable, and rerun XFLOW to copy in the updated files.

Development System Reference Guide

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Xilinx 8.2i manual Using the SCR, BAT, or TCL File, Using the Xilxflowpath Environment Variable, Running Xflow
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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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