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combinatorial logic

Combinatorial logic refers to any primitives with the exception of storage elements such as flip-flops.

compiler

A compiler is a language interpreter. The Synopsys compiler interprets HDL and makes concurrent process implementations for target architectures.

component

A component is an instantiation or symbol reference from a library of logic elements that can be placed on a schematic.

configuration

Configuration is the process of loading design-specific bitstreams into one or more FPGA devices to define the functional operation of the logical blocks, their interconnections, and the chip I/O.

This concept also refers to the configuration of a design directory for a particular design library.

constraints

Constraints are specifications for the implementation process. There are several categories of constraints: routing, timing, area, mapping, and placement constraints.

Using attributes, you can force the placement of logic (macros) in CLBs, the location of CLBs on the chip, and the maximum delay between flip-flops. PAR does not attempt to change the location of constrained logic.

constraints file

A constraints file specifies constraints (location and path delay) information in a textual form. An alternate method is to place constraints on a schematic.

contention

Contention is the state in which multiple conflicting outputs drive the same net.

counter

A counter is a circuit, composed of registers, that counts pulses, often reacting or causing a reaction to a predetermined pulse or series of pulses. Also called a divider, sometimes accumulator.

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Development System Reference Guide

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Xilinx 8.2i manual Combinatorial logic, Compiler, Component, Configuration, Constraints file, Contention, Counter
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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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