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Xilinx 8.2i 2Clock Skew and Setup Checking Terminology Terms Definition, 2Clock Skew Example

Models: 8.2i

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Chapter 12: TRACE

R

In the following figure, the clock skew Tsk is the delay from the clock input (CLKIOB) to

Table 12-2:Clock Skew and Setup Checking Terminology

Terms

Definition

 

 

constraint

The required time interval for the path, either specified explicitly by you

 

with a FROM TO constraint, or derived from a PERIOD constraint.

 

 

Tpath

The summation of component and connection delays along the path.

 

 

Tsu (setup)

The setup requirement for the destination register.

 

 

Tsk (skew)

The difference between the arrival time for the destination register and

 

the source register.

 

 

Slack

The negative slack shows that a setup error may occur, because the data

 

from the source register does not set up at the target register for a

 

subsequent clock edge.

 

 

register D (TclkD) less the delay from the clock input (CLKIOB) to register S (TclkS). Negative skew relative to the destination reduces the amount of time available for the data path, while positive skew relative to the destination register increases the amount of time available for the data path.

S

CLKIOB

Interconnect

and Logic

D

X8260

Figure 12-2:Clock Skew Example

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Xilinx 8.2i manual 2Clock Skew and Setup Checking Terminology Terms Definition, 2Clock Skew Example
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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.