AR# 5201: 1.5i Map - Virtex mapper fails to pack 2 FMAPs and 2 MUXCY_Ls into one slice.
AR# 5201
1.5i Map - Virtex mapper fails to pack 2 FMAPs and 2 MUXCY_Ls into one slice.
Description
FATAL_ERROR:xvkma:xvkmapper.c:1691:1.112 - Cannot satisfy LOC/RLOC constraint on comp H29/$I82/$1I55
The errors appear to be due to map trying to suck extra logic in at the mux inputs. This prevents map from being able to use the same configuration for both the CY0G and CY0F muxes. The slice can not support these two muxes in different configurations.
解决方案
Keep properties on the MUXCY_L inputs prevent the mapper from trying to merge too much logic into the slice:
NET "H29/&__A__26" KEEP ;
If GND nets are involved, use a buffer between GND and the MUX input if possible with a KEEP property on the output net of the buffer.
This error is being investigated for a possible bug fix.