Answers Database
LCA2XNF 5.2.1: Outputs an Inaccurate .xnf file
Record #2074
Product Family: Software
Product Line: XACT FPGA
Product Part: lca2xnf
Product Version: 5.2.1
Problem Title:
LCA2XNF 5.2.1: Outputs an Inaccurate .xnf file
Problem Description:
Urgency: Standard
General Description:
--For xc4000/xc4000E under some particular routing conditions
LCA2XNF 5.2.1 might:
*Loose the D pin on a RAM
*Loose the D pin or SR pin on a CLB flipflop
--For the 5200 family:
*The .xnf file might have a 5-input gates, where it should
generate a gates with inputs of up to 4.
*Also it might invert the I-pin to an IBUF, where it really
should have inverted the o-pin of the IBUF instead.
After translating a .lca file to a .xnf file no errors occur.
But with closer inspection of the .xnf file, one can see that
some flipflop's are missing a D inputs.
Solution 1:
Get a patched version of LCA2XNF from the xilinx ftp site.
(Xilinx File ftp://ftp.xilinx.com/pub/swhelp/xact-pc/lca2xnf.zip )
(Xilinx File ftp://ftp.xilinx.com/pub/swhelp/xact-workstation/lca2xnf.sun4.tar.Z)
(Xilinx File ftp://ftp.xilinx.com/pub/swhelp/xact-workstation/lca2xnf.hppa.tar.Z)
Choose the patch according to your
Operating system.
End of Record #2074 - Last Modified: 06/13/97 16:13 |
