Output files for Fpga Timing Simulation

Chapter 22: NetGen

•SDF file—This SDF 3.0 compliant standard delay format file contains delays obtained from the input design files.

•V file—This is a IEEE 1364-2001 compliant Verilog HDL file that contains the netlist information obtained from the input design files. This file is a simulation model of the implemented design and cannot be synthesized or used in any manner other than simulation.

•VHD file—This VHDL IEEE 1076.4 VITAL-2000 compliant VHDL file contains the netlist information obtained from the input design files. This file is a simulation model of the implemented design and cannot be synthesized or used in any other manner than simulation.

CPLD Timing Simulation

You can use the NetGen Timing Simulation flow to verify the timing of a CPLD design after it is implemented using CPLDfit and the delays are annotated using the –tsim option. The input file is the annotated NGA file from the TSIM program.

Note: See Chapter 18, “CPLDfit” and Chapter 19, “TSIM” for additional information.

The figure below illustrates the NetGen Timing Simulation flow using a CPLD design.

NGA

NetGen

V/VHD SDF Simprim

Library

Simulation Tool

X9982

Figure 22-3:CPLD Timing Simulation

Input files for CPLD Timing Simulation

The CPLD Timing Simulation flow uses the following files as input:

•NGA file—This native generic annotated file is a logical design file from TSIM that contains Xilinx primitives. See Chapter 19, “TSIM” for additional information.

Output files for CPLD Timing Simulation

The NetGen Simulation Flow uses the following files as output:

•SDF file—This standard delay format file contains delays obtained from the input NGA file.

322

www.xilinx.com

Development System Reference Guide

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 Output files for Fpga Timing Simulation, Cpld Timing Simulation

Models: 8.2i

Chapter 22: NetGen