Answers Database
2.1i Virtex Map - ERROR:xvkpu - Unable to obey design constraints ...
Record #7277
Product Family: Software
Product Line: FPGA Implementation
Product Part: map
Product Version: 2.1i
Problem Title:
2.1i Virtex Map - ERROR:xvkpu - Unable to obey design constraints ...
Problem Description:
A case has been seen where an apparently good slice configuration is
rejected by map with the error:
ERROR:xvkpu - Unable to obey design constraints (MACRONAME =
Vid_core/VidData/sensor/gain/vidhist/add1/hset, RLOC = R1C0.S1) which require
the combination of the following symbols into a single slice:
LUT symbol "Vid_core/VidData/sensor/gain/vidhist/add1/U2/$I521" (Output
Signal = Vid_core/VidData/sensor/gain/vidhist/add1/U2/HALFADD0)
MUXCY symbol "Vid_core/VidData/sensor/gain/vidhist/add1/U2/$I522" (Output
Signal = Vid_core/VidData/sensor/gain/vidhist/add1/U2/$Net00007_)
XORCY symbol "Vid_core/VidData/sensor/gain/vidhist/add1/U2/$I523" (Output
Signal = Vid_core/VidData/sensor/gain/vidhist/hist3c<18>)
MULTAND symbol "Vid_core/VidData/sensor/gain/vidhist/add1/U2/$I524" (Output
Signal = Vid_core/VidData/sensor/gain/vidhist/add1/U2/$Net00012_)
LUT symbol "Vid_core/VidData/sensor/gain/vidhist/add1/U2/$I525" (Output
Signal = Vid_core/VidData/sensor/gain/vidhist/add1/U2/HALFADD1)
MUXCY symbol "Vid_core/VidData/sensor/gain/vidhist/add1/U2/$I526" (Output
Signal = Vid_core/VidData/sensor/gain/vidhist/add1/$Net00027_)
XORCY symbol "Vid_core/VidData/sensor/gain/vidhist/add1/U2/$I527" (Output
Signal = Vid_core/VidData/sensor/gain/vidhist/hist3c<19>)
MULTAND symbol "Vid_core/VidData/sensor/gain/vidhist/add1/U2/$I528" (Output
Signal = Vid_core/VidData/sensor/gain/vidhist/add1/U2/$Net00013_)
There is a conflict for the F function generator position.
Solution 1:
For this case, the problem was found to be due to a problem in logic replication
and could be worked around by disabling logic replication (-l switch).
Solution 2:
This problem is fixed in the latest 2.1i Service Pack available at:
http://support.xilinx.com/support/techsup/sw_updates/
End of Record #7277 - Last Modified: 10/18/99 10:28 |
