In Vivado 2015.4, LUTRAMs such as two RAM32Ms can be placed into the same SLICE even though they have different clock inversion properties (IS_WCLK_INVERTED=1 compared to IS_WCLK_INVERTED=0).
This is an illegal placement and can lead to functional issues.
Expectation with the patch installed:
The placement results should not include two LUTRAMs with different inversions in the same SLICE.
Expectation without the patch installed:
An illegal placement is possible.
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