Gf Guide NCD File, Globalopt Global Optimization

MAP Options

–f (Execute Commands File)

–fcommand_file

The –f option executes the command line arguments in the specified command_file. For more information on the –f option, see “–f (Execute Commands File)” in Chapter 1.

–gf (Guide NCD File)

–gfguidefile

The –gf option specifies the name of an existing NCD file (from a previous MAP run) to be used as a guide for the current MAP run. Guided mapping also uses an NGM file. For a description of guided mapping, see the “Guided Mapping” section of this chapter.

Note: When using guided mapping with the –timing(Timing-Driven Packing and Placement), Xilinx recommends using a placed NCD as the guide file. A placed NCD is produced by running MAP – timing or PAR.

–global_opt (Global Optimization)

–global_opt onoff

This option directs MAP to perform global optimization routines on the fully assembled netlist before mapping the design. Global optimization includes logic remapping and trimming, logic and register replication and optimization, and logic replacement of tristates. These routines will extend the runtime of Map because extra processing occurs. This option is available for Virtex-4 designs. By default this option is off.

When using the –global_opt option, Modular and Incremental design flows are not recommended. Incremental guide mode is explicitly prohibited and Formal Verification flows will be negatively affected. Also, certain MAP properties are not allowed in conjunction with global optimization, such as the –gf, –ol, and –u options.

Note: See also the “–equivalent_register_removal (Remove Redundant Registers)” and “–retiming (Register Retiming During Global Optimization)” options for use with –global_opt.

–gm (Guide Mode)

–gm {exact leverage}

The –gm option specifies the form of guided mapping to be used.

In the EXACT mode the mapping in the guide file is followed exactly. In the LEVERAGE mode, the guide design is used as a starting point for mapping but, in cases where the guided design tools cannot find matches between net and block names in the input and guide designs, or your constraints rule out any matches, the logic is not guided.

For a description of guided mapping, see “Guided Mapping”.

–gm incremental (Guide Mode incremental)

par -gf previous_run_NCD -gm incremental design.ncd new_design.ncd design.pcf

The incremental guide mode uses EXACT guiding. It also changes the Partial

Reconfiguration DRC checks.

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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.

Xilinx 8.2i manual Gf Guide NCD File, Globalopt Global Optimization, Gm Guide Mode, MAP Options

Models: 8.2i