AR# 10865: 3.1i Virtex PAR - The router has changed so that backbone resources are always used when the USELOWSKEWLINES constraint is assigned to a net.
AR# 10865
3.1i Virtex PAR - The router has changed so that backbone resources are always used when the USELOWSKEWLINES constraint is assigned to a net.
General Description: In the past, the router would sometimes move nets off low-skew backbone resources in an attempt to meet timing constraints, even though the net was constrained to use these resources with the USELOWSKEWLINES constraint. This will no longer occur.
NOTE: This issue affects the Virtex, Virtex-E and Spartan-II device architectures.