Xilinx 8.2i manual PAR Flow

Models: 8.2i

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Chapter 9: PAR

R

PAR places and routes a design based on the following considerations:

Timing-driven—The Xilinx timing analysis software enables PAR to place and route a design based upon timing constraints. See the “Timing-driven PAR” section of this chapter for more information.

Non Timing-driven (cost-based)—Placement and routing are performed using various cost tables that assign weighted values to relevant factors such as constraints, length of connection, and available routing resources. Non timing-driven placement and routing is used if no timing constraints are present.

The design flow through PAR is shown in the following figure. This figure shows a PAR run that produces a single output design file (NCD)

Input for Re-Entrant PAR

Guide File

Guide File

Report

NCD

Circuit Description

(Mapped)

PAR

PCF

Physical Constraints

PAR

PAR Report

CSV, PAD, TXT Pin Information

Intermediate

Failing Timespec

Summary

NCD

Circuit Description

(Placed/Routed)

Figure 9-1: PAR Flow

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Xilinx 8.2i manual PAR Flow

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.