This chapter introduces the Xilinx design entry process. You can enter a design with a schematic editor, a text-based tool, or both. For the Alliance software, these entry methods require Xilinx-supported third-party tools, which produce a design file in some third party netlist formats.
Design entry begins with a design concept, expressed as a drawing or functional description. From the original design, a netlist is created, then synthesized and translated into a generic object file (NGO). This file is fed into a program called NGDBuild, which produces a logical generic database file (NGD).
The chapter consists of the following major sections.
The following figure illustrates design entry process.
Figure 2.1 Design Entry Flow |  |
The NGD2XNF translation program is not supported by Xilinx M1.5 software.
The following sections describe the schematic and text-based design entry methods in detail.
