请问在ISE modular design 方法中 *.ngo文件的作用是什么?谢谢大家!第一次登陆论坛,看到这么多高手,真是很激动.希望论坛越办越好!

ngo是xilinx的网表文件的一种格式。5 {+ q3 [/ S: V
下面这个xilinx的faq你可以参考一下：6 h" g3 G( P& u9 ?# Y
Problem Description:
( f: Q* i) v* Y/ I, ^Keywords: modular, design, NGC, NGO, NGDBuild, netlist, output
' }$ E3 l) ]* Z* O% L& p- s5 jUrgency: Standard 4 f  Y: s& D3 D3 P1 N  A
General Description:
" W2 N# N, x3 ^2 K7 MWhen using Modular Design in ISE 5.x, the following command line is run on an NGC netlist: 0 {7 j) ~0 S6 ?, F+ _
ngdbuild -modular initial design_name 9 V& ]  E& Q; B$ [  g) j; a2 |! h# {# \
This does not create an NGO file as it does when using an EDIF netlist. Is this the correct behavior? / A1 k6 E; U6 i0 P
Solution 1:3 O7 m+ d" v# c

; I1 `( M( A$ {6 _An NGO file is only produced if an EDIF netlist is used as the input to NGDBuild. The NGC netlist created by XST is already in Xilinx Database Format, and does not need to be converted to an NGO file.
  j1 z9 \0 [$ L) U, K2 ?# R, x) B

Thank you,Westor!! {$ Y6 J4 r* K# T- S" I
You remind me of the FAQ from Xilinx. From the following3 c/ s' i6 u( O, ~" O) a
discription,I realize NGO file may be an intermediate format which is needed to generate NGD file.
, Y# V/ h$ a1 @  e# e  E' r"The EDIF2NGD program allows you to read an EDIF (Electronic Design Interchange Format) 2 0 0 file into the Xilinx Development System toolset.
# e3 F5 A: @7 a! u9 eEDIF2NGD converts an industry-standard EDIF netlist to an NGO file—a
7 K: U: F% @8 e" r; MXilinx-specific format. The EDIF file includes the hierarchy of the input schematic. The output NGO file is a binary database describing the design in terms of the components and hierarchy specified in the input design file. After you convert the EDIF file to an NGO file, you run NGDBuild to create an NGD file, which expands the design to include a description reduced to Xilinx primitives." & y& o4 @9 g( E: p

Yes you are right!