No Placement, Pl Placer Effort Level, No Routing

PAR Options

You can override the placer level set by the –ol option by entering a –pl (Placer Effort Level) option, and you can override the router level by entering a –rl (Router Effort Level) option.

par -ol high design.ncd output.ncd design.pcf

–p (No Placement)

The –p option bypasses the placer and proceeds to the routing phase. A design must be fully placed when using this option or PAR will issue an error message and exit. When you use this option, existing routes are ripped up before routing begins. You can, however, leave the routing in place if you use the –k option instead of the –p option.

par -p design.ncd output.ncd design.pcf

Note: The –poption is recommended when you have an MFP or UCF written from Floorplanner or wish to maintain a previous NCD placement but run the router again.

–pl (Placer Effort Level)

–plplacer_effort_level

The –pl option sets the placer effort level. The effort level specifies the level of effort used when placing the design. This option overrides the setting specified for the –ol option. For a description of effort level, see “–ol (Overall Effort Level)”.

The placer_effort_level setting is std, med, or high, and the default level set if you do not enter a –pl option is determined by the setting of the –ol option.

par -pl high placed_design.ncd output.ncd design.pcf

–power (Power Aware PAR)

The –power option optimizes the capacitance of non-timing driven design signals. The default setting for this option is off.

–r (No Routing)

Use the –r option to prevent the routing of a design. The –r option causes the design to exit before the routing stage.

par -r design.ncd route.ncd design.pcf

–rl (Router Effort Level)

–rlrouter_effort_level

The –rl option sets the router effort level. The effort level specifies the level of effort used when routing the design. This option overrides the setting for the –ol option. For a description of effort level, see “–ol (Overall Effort Level)”.

The router_effort_level setting is std, med, or high, and the default level set if you do not enter a –rl option is determined by the setting of the –ol option. In the example that follows, the placement level is at std (default) and the router level is at the highest effort level.

par -rl high design.ncd output.ncd design.pcf

Development System Reference Guide

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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 No Placement, Pl Placer Effort Level, Power Power Aware PAR, No Routing

Models: 8.2i