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412 www.xilinx.com Development System Reference Guide
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NCD
A Native Circuit Description (NCD). The physical database format for
Xilinx Implementation software tools.
net
A logical connection between two or more symbol instance pins. After
routing, the abstract concept of a net is transformed to a physical
connection called a wire.
An electrical connection between components or nets. It can also be a
connection from a single component. It is the same as a wire or a
signal.
netlist
A netlist is a text description of the circuit connectivity. It is basically
a list of connectors, a list of instances, and, for each instance, a list of
the signals connected to the instance terminals. In addition, the netlist
contains attribute information.
network
A network is a collection of logic elements and the wires (nets or
connections) that define how they interconnect.
NetGen
A program that reads in applicable Xilinx implementation files,
extracts design data, and generates netlists that are used with
supported third-party simulation, equivalence checking, and static
timing analysis tools.
NGDBuild
A program that converts all input design netlists and then writes the
results into a single merged file.
NGM
A design file produced by MAP that contains information about the
logical design and information about how the logical design
corresponds to the physical design.
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optimization
Optimization is the process that decreases the area or increases the
speed of a design.