R

H

HDL

Hardware Description Language. A language that describes circuits in textual code. The two most widely accepted HDLs are VHDL and Verilog.

An HDL, or hardware description language, describes designs in a technology-independent manner using a high level of abstraction. The most common HDLs in use today are Verilog and VHDL.

hexadecimal

Hexadecimal is a numbering system with a base of 16 digits (0, 1, 2, 3, 4, 5, 6, 7, 8, 9, A, B, C, D, E, F)

hierarchical annotation

Hierarchical annotation is an advance method of running logical annotation that requires three things: 1) .ncd file, 2) .ngm file, and 3) KEEP_HIERARCHY constraint placed on explicit hierarchy blocks prior to mapping. When this is done, the back-annotation guarantees to preserve the user’s hierarchy.

hierarchical design

A hierarchical design is a design composed of multiple sheets at different levels of your schematic.

hold time

Hold time is the time following a clock event during which the data input to a latch or flip-flop must remain stable in order to guarantee that the latched data is correct.

Hprep6

A program that takes an implemented CPLD design (VM6) file from

CPLDfit and generates a JEDEC (JED) programming file.

I

IBUF

An IBUF acts as a protection for the chip, shielding it from eventual current overflows.

IC

Integrated Circuit (IC) is a single piece of silicon on which thousands or millions of transistors are combined. ICs are the major building blocks of modern electronic systems.

Development System Reference Guide

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Xilinx 8.2i manual Hdl, Ibuf
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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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