AR# 6289: 1.5i Virtex Map - Not all instances a timespec are being covered by the resulting .pcf file.
AR# 6289
1.5i Virtex Map - Not all instances a timespec are being covered by the resulting .pcf file.
Description
Keywords: bus, bit, slice, timespec, map
Urgency: Standard
General Description: Not all instances covered by a timespec are being covered by the resulting .pcf file.
Solution
The 1_5 mapper has a bug when packing FDCP or FDRS type flops. The tspecs are not properly transferred. A workaround is to prevent any packing around FDCP or FDRS flops by applying XBLKNM attributes to the instances involved..
INST "inst_name" XBLKNM=unique_string" ;
This problem has been fixed in the 2.1i release, due to begin shipping in June.