1.5i: 9500XL: Hitop : BUFT and Clock polarity inverted
描述
Keywords: 9500XL, polarity, inversion
Urgency: Hot
General Description: A problem was detected on a few select cases with designs showing inverted output from a clock signal or obuft.
解决方案
Please refer to solution 6427 for the ftp site location of the patch to be installed on top of 1.5i with Service Pack 2. (http://www.xilinx.com/techdocs/6427.htm)
For a temporary workaround you can place a keep attribute on the tristate signal to prevent the polarity inversion.