R

script

A script is a series of commands that automatically execute a complex operation such as the steps in a design flow.

SDF (standard delay format)

Standard Delay Format (SDF) is an industry-standard file format for specifying timing information. It is usually used for simulation.

seed

A seed is a random number that determines the order of the cells in the design to be placed.

set/reset

This operation is made possible by the asynchronous set/reset property. This function is also implemented by the Global Reset STARTUP primitive.

shift register

A shift register is a register in which data is loaded in parallel and shifted out of the register again. It refers to a chain of flip-flops connected in cascade.

signal

A signal is a wire or a net. See “net.”

simulation

Simulation is the process of verifying the logic and timing of a design.

skew

Skew is clock delay. See clock skew.

slew rate

The slew rate is the speed with which the output voltage level transitions from +5 V to 0 V or vice-versa. The slew rate determines how fast the transistors on the outputs change states.

slice

Two slices form a CLB within Virtex and Spartan-II families.

speed

Speed is a function of net types, CLB density, switching matrices, and architecture.

STARTUP symbol

The STARTUP symbol is a symbol used to set/reset all CLB and IOB flip-flops.

Development System Reference Guide

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Xilinx 8.2i Script, SDF standard delay format, Seed, Set/reset, Shift register, Signal, Simulation, Skew, Slew rate, Slice

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.