enable_constraints (enable constraints for analysis)
The timing_analysis enable_constraints command enables the specified timing constraints for the analysis.
% timing_analysis enable_constraints <analysis_name> <timing_constraint_specs> timing_analysis is the name of the Xilinx Tcl command.
enable_constraints is the name of the timing_analysis subcommand.
analysis_name specifies the name of the analysis generated previously with the timing_analysis new command.
timing_constraint_specs specifies the names and specs of the constraints to be enabled for analysis.
Number of components that were disabled.
Tcl Return:
In this example, the specified components, ureg_1, ureg_2, and ureg_3 are disabled for the timing path analysis.
Description:
component_name specifies the name of the components to be disabled.
Example: % timing_analysis disable_cpt stopwatch_timing
reg_sr_clk “ureg_1 ureg_2 ureg_3”

Chapter 3: Tcl

R

Example:

% timing_analysis enable_constraints

 

stopwatch_timing “TS_clk=PERIOD TIMEGROUP\”sclk\”

 

20 ns HIGH 50.00000%;”

 

 

Description:

In this example, the specified timing constraint is enabled for

 

analysis.

Tcl Return:

Number of enabled constraints.

enable_cpt (enable components for path tracing control)

The timing_analysis enable_cpt command enables specified components associated with a path tracing control for a timing path analysis.

%timing_analysis enable_cpt <analysis_name> <cpt_symbol> <component_name>

timing_analysis is the name of the Xilinx Tcl command.

enable_cpt is the name of the timing_analysis subcommand.

analysis_name specifies the name of the analysis generated previously with the timing_analysis new command.

cpt_symbol specifies a path tracing control that determines whether associated components are considered for the timing path analysis.

component_name specifies the name of the components to enable.

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Development System Reference Guide

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Xilinx 8.2i Enablecpt enable components for path tracing control, Timinganalysis enableconstraints, Ns High 50.00000%
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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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