AR# 11125: 3.1i Virtex MAP - An XORCY is mistaken for a LUT, which leads to a pack error.
3.1i Virtex MAP - An XORCY is mistaken for a LUT, which leads to a pack error.
Keywords: XORCY, LUT, pack error, ERROR:Pack:679
General Description: In the following pack error, "U1/U1/BU2" is actually an XORCY, so the RLOC should be valid:
ERROR:Pack:679 - Unable to obey design constraints (MACRONAME = U1/U1/hset, RLOC = R6C0.S1) which require the combination of the following symbols into a single slice component: LUT symbol "U1/U1/BU0" (Output Signal = U1/U1/N46) LUT symbol "U1/U1/BU2" (Output Signal = P75BP<0>) LUT symbol "U1/U1/BU3" (Output Signal = U1/U1/N66) MUXCY symbol "U1/U1/BU4" (Output Signal = U1/U1/N82) XORCY symbol "U1/U1/BU5" (Output Signal = P75BP<1>) There are more than two function generators. Please correct the design constraints accordingly.