I receive the following error when I run Guided MAP on my design. What does this mean?
"ERROR:Pack:1118 - The symbol ... was unable to be implemented in a Slice containing no other symbols. Function generator
... has a site constraint other than "F". Check that the constraints on this symbol make sense in isolation."
This error is an indication of an inappropriate BEL constraint on a logical element. In this case, Guide was generating invalid BEL constraints automatically for RAM16X1D symbols.
This problem is fixed for ISE version 8.1i. Meanwhile, to work around this issue, set the following environment variable:
Linux and Solaris
setenv XIL_MAP_NO_BEL_GUIDE 1
For general information about setting ISE environment variables, see (Xilinx Answer 11630).