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AR# 2074

5.2.1 LCA2XNF - Outputs an Inaccurate .xnf file

Description

Keywords: LCA2XNF, missing, D pin, 5-input gate, invert

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

Get a patched version of LCA2XNF from the xilinx ftp site.
(Xilinx File http://www.xilinx.com/txpatches/pub/swhelp/xact-pc/lca2xnf.zip)
(Xilinx File http://www.xilinx.com/txpatches/pub/swhelp/xact-workstation/lca2xnf.sun4.tar.Z)
(Xilinx File http://www.xilinx.com/txpatches/pub/swhelp/xact-workstation/lca2xnf.hppa.tar.Z)

Choose the patch according to your
Operating system.
AR# 2074
Date Created 08/31/2007
Last Updated 03/22/2000
Status Archive
Type ??????