Insertkeephierarchy, Libraries to Search, Synopsys

NGDBuild Options

–insert_keep_hierarchy

This option automatically attaches the KEEP_HIERARCHY constraint to each input netlist. It should only be used when performing a bottom-up synthesis flow, where separate netlists are created for each piece of hierarchy. It is highly recommended that when using this option, good design practices are used as described in the Synthesis and Simulation Design Guide.

Note: Care should be taken when trying to use this option with Cores, as they may not be coded for maintaining hierarchy.

–intstyle (Integration Style)

–intstyle {ise xflow silent}

The –intstyle option reduces screen output based on the integration style you are running. When using the –intstyle option, one of three modes must be specified: ise, xflow, or silent. The mode sets the way information is displayed in the following ways:

–intstyle ise

This mode indicates the program is being run as part of an integrated design environment.

–intstyle xflow

This mode indicates the program is being run as part of an integrated batch flow.

–intstyle silent

This mode limits screen output to warning and error messages only.

Note: The -intstyle option is automatically invoked when running in an integrated environment, such as Project Navigator or XFLOW.

–l (Libraries to Search)

–llibname

The –l option indicates the list of libraries to search when determining what library components were used to build the design. This option is passed to the appropriate netlist reader. The information allows NGDBuild to determine the source of the design’s components so it can resolve the components to NGD primitives.

You can specify multiple libraries by entering multiple –llibname entries on the NGDBuild command line.

The allowable entries for libname are the following:

•xilinxun (Xilinx Unified library)

•synopsys

Note: You do not have to enter xilinxun with a –l option. The Xilinx Development System tools automatically access these libraries. In cases where NGDBuild automatically detects Synopsys designs (for example, the netlist extension is .sedif), you do not have to enter synopsys with a –l option.

Development System Reference Guide

www.xilinx.com

123

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 Insertkeephierarchy, Libraries to Search, NGDBuild Options, Synopsys

Models: 8.2i