R

Using XPower

options is one or more of the XPower options listed in “Command Line Options”. Separate multiple options with spaces.

design name is the name of the output power report file with a .pwr extension. If a file name is not specified with the -o option, by default XPower generates a .pwr file with the same root name as the infile.

Using XPower

This section describes the settings necessary to obtain accurate power and thermal estimates, and the methods that XPower allows. This section refers specifically to FPGA designs. For CPLD designs, please see Xilinx Application Note XAPP360 at http://www.xilinx.com/support.

VCD Data Entry

The recommended XPower flow uses a VCD file generated from post PAR simulation. To generate a VCD file, you must have a Xilinx supported simulator. See the Synthesis and Simulation Design Guide for more information.

XPower supports the following simulators:

•ISIM

•ModelSim

•Cadence Verilog XL

•Cadence NC-Verilog

•Cadence NC-VHDL

•Cadence NC-SIM

•Synopsys VCS

•Synopsys Scirocco

XPower uses the VCD file to set toggle rates and frequencies of all the signals in the design. Manually set the following:

•Voltage (if different from the recommended databook values)

•Ambient temperature (default = 25 degrees C)

•Output loading (capacitance and current due to resistive elements)

For the first XPower run, voltage and ambient temperature can be applied from the PCF, provided temperature and voltage constraints have been set.

Xilinx recommends creating a settings file (XML). A settings file saves time if the design is reloaded into XPower. All settings (voltage, temperature, frequencies, and output loading) are stored in the settings file. See the “-wx (Write XML File)” section of this chapter for more information.

Development System Reference Guide

www.xilinx.com

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Xilinx 8.2i manual Using XPower, VCD Data Entry
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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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