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IBISWriter Input Files

IBISWriter Input Files

IBISWriter requires a design source file as input.

•FPGA Designs

Requires a physical description of the design in the form of an NCD file with a .ncd file extension.

•CPLD Designs

The input is produced by CPLDfit and has a .pnx file extension.

IBISWriter Output Files

IBISWriter outputs an .ibs ASCII file. This file comprises a list of pins used by your design, the signals internal to the device that connect to those pins, and the IBIS buffer models for the IOBs connected to the pins. The format of the IBIS output file is determined by the IBIS standard. The output file must be able to be validated by the Golden Parser to ensure that the file format conforms to the specification.

Note: IBISWriter gives an error message if a pin with an I/O Standard for which no buffer is available is encountered, or if a DCI value property is found for which no buffer model is available. After an error message appears, IBISWriter continues through the entire design, listing any other errors if and when they occur, then exiting without creating the .ibs output file. This error reporting helps users to identify problems and make corrections before running the program again.

IBISWriter Options

This section provides information on IBISWriter command line options.

–allmodels (Include all available buffer models for this architecture)

To reduce the size of the output .ibs file, IBISWriter produces an output file that contains only design-specific buffer models, as determined from the active pin list. For users who wish to access all available buffer models, the –allmodels command line option should be used.

Use the following syntax when using the –allmodels option:

ibiswriter –allmodels infile outfile.ibs

–g (Set Reference Voltage)

The –g command line option varies by architecture as shown in Table 17-1.

Use the following syntax when using the –g option:

ibiswriter –goption_value_pair infile outfile.ibs

The following is an example using the VCCIO:LVTTL option value pair.

ibiswriter –g VCCIO:LVTTL design.ncd design.ibs

The –g option supports only the architectures listed in the following table:

Development System Reference Guide

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Xilinx 8.2i manual IBISWriter Input Files, IBISWriter Output Files, IBISWriter Options, Set Reference Voltage
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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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