Xilinx 8.2i manual Lsb

Models: 8.2i

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library

A library is a set of macros, such as adders, buffers, and flip-flops that is part of the Xilinx interface. A library is used to create schematic designs.

load

A load is an input port.

logic

Logic is one of the three major classes of ICs in most digital electronic systems: microprocessors, memory, and logic. Logic is used for data manipulation and control functions that require higher speed than a microprocessor can provide.

logical annotation

The method of back-annotation that uses the old .ngm and .ncd to attempt to back-annotate the physical information (physical delays) back into the logical (.ngd) file.

logic allocation file

A logic allocation file, design.ll file, designates a file used for probing. The file provides bit locations of the values of RAM, I/O, latches, and flip-flops.

logic optimization

Logic optimization is the process that decreases the area or increases the speed of a design.

longline

A longline connects to a primary global net or to any secondary global net. Each CLB has four dedicated vertical longlines. These lines are very fast.

look-up table (LUT)

A Look-Up Table (LUT), implements Boolean functions.

See function generator.

low

Low is a logical state for which no output is generated.

LSB

An LSB, or least significant bit, is the left-most bit of the bus bounds or indexes. In one-hot and twos-complement encoding, the LSB is the right-most bit.

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Development System Reference Guide

Page 410
Image 410
Xilinx 8.2i manual Lsb