Tsim Create a File for Timing Simulation, Testclk.prj

XFLOW Flow Types

If you have multiple VHDL files, you must list all the source files in a text file, one per line and pass that information to XFLOW using the –g (Specify a Global Variable) option. Assume that the file that lists all source files is filelist.txt and design_name.vhd is the top level design. Use the following example:

xflow -p xc2v250fg256-5 -g srclist:filelist.txt -synth synplicity_vhdl.opt design_name.vhd

The same rule applies for Verilog too.

The following example shows how to use a combination of flow types to synthesize and implement a design:

xflow -p xc2v250fg256-5-synth xst_vhdl.opt -implement balanced.opt testclk.prj

Option Files for -synth Flow Types

Xilinx provides the following option files for use with the –synth flow type. These files allow you to optimize your design based on different parameters.

Table 23-12:Option Files for –synth Flow Type

	Option File	Description

	xst_vhdl.opt	Optimizes a VHDL source file for
	leonardospectrum_vhdl.opt	speed, which reduces the number of
	leonardospectrum_vhdl.opt	logic levels and increases the speed of
	synplicity_vhdl.opt	logic levels and increases the speed of
	synplicity_vhdl.opt	the design
		the design

	xst_verilog.opt	Optimizes a Verilog source file for
	leonardospectrum_verilog.opt	speed, which reduces the number of
	leonardospectrum_verilog.opt	logic levels and increases the speed of
	synplicity_verilog.opt	logic levels and increases the speed of
	synplicity_verilog.opt	the design
		the design

	xst_mixed.opt	Optimizes a mixed level VHDL and
		Verilog source file for speed, which
		reduces the number of logic levels and
		increases the speed of the design.

The following example shows how to use a combination of flow types to synthesize and implement a design:

xflow –p xc2v250fg256-5 –synth xst_vhdl.opt -implement balanced.opt

testclk.prj

–tsim (Create a File for Timing Simulation)

–tsimoption_file

This flow type generates a file that can be used for timing simulation of an FPGA or CPLD design. It invokes the fpga.flw or cpld.flw flow file, depending on your target device. For FPGAs, it runs NetGen. For CPLDs, it runs TSim and NetGen. This creates a time_sim.v or time_sim.vhdl file that contains a netlist description of your design in terms of Xilinx simulation primitives. You can use the output timing simulation file to perform a back-end simulation with a simulator.

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 Tsim Create a File for Timing Simulation, Option Files for -synth Flow Types

Models: 8.2i