Answers Database
A1.4/F1.4 MAP - ERROR: x4kma:312 - Following symbols could not be constrained
Record #4165
Product Family: Software
Product Line: FPGA Implementation
Product Part: map
Product Version: 1.4.
Problem Title:
A1.4/F1.4 MAP - ERROR: x4kma:312 - Following symbols could not be constrained
Problem Description:
Urgency: Standard
General Description: MAP issues an error similar to the
following:
ERROR:x4kma:312 - The following symbols could not be constrained to a single
CLB:
HMAP symbol "CursorRamComp/sp64x2/ablock/large_ram_we0/newSim14" (output
signal=CursorRamComp/ablock/dwe_0)
FMAP symbol "U1154_map" (output signal=CpuCursorHighWrSig)
DFF symbol "CursorRamComp/sp64x2/ablock/large_ram_we0/newSim10/dff" (output
signal=CursorRamComp/ablock/dcode_0)
FMAP symbol
"CursorRamComp/sp64x2/ablock/large_ram_we0/dcodeslice_0func/newSim9" (output
signal=CursorRamComp/ablock/large_ram_we0/dcode_in_0)
DFF symbol "CursorRamComp/sp64x2/ablock/large_ram_membank1_0u2/newSim44/dff"
(output signal=CursorRamComp/ablock/large_ram_membank1_0u2/ff_dout_0)
RAM16X1S symbol
"CursorRamComp/sp64x2/ablock/large_ram_membank1_0u2/newSim42/ram" (output
signal=CursorRamComp/ablock/large_ram_membank1_0u2/ff_din_0)
These symbols share the same RLOC attribute value, which requires them to
be mapped to the same CLB.
Errors have been found in this design. No output files have been written.
Solution 1:
In general this error indicates that map is unable to follow the
RLOC constraints for a particular CLB. The error message lists
the combination of FMAP, HMAP, DFF, RAM and Carry symbols involved
and attempts to explain why the CLB pack failed.
For this particular case, the problem is that an unconstrained
FMAP is being merged into the CLB because it drives the constrained
HMAP. This is being done before any checking is done for conflicts
with other constrained symbols.
The work around for this problem is to install the latest Core Tools Update
and set the environment variable XIL_MAP_NO_FMAP_PACK. This prevents the
merger of unconstrained FMAPs based on HMAP connectivity.
Solaris: ftp://ftp.xilinx.com/pub/swhelp/M1.4_alliance/core_sol17_m14.tar.Z
SunOS ftp://ftp.xilinx.com/pub/swhelp/M1.4_alliance/core_sun17_m14.tar.Z
HPUX: ftp://ftp.xilinx.com/pub/swhelp/M1.4_alliance/core_hp17_m14.tar.Z
Win95/NT: ftp://ftp.xilinx.com/pub/swhelp/M1.4_alliance/core_nt17.zip
Support for the XIL_MAP_NO_FMAP_PACK variable is not in original M1.5
release, but will be added with the first update.
End of Record #4165 - Last Modified: 05/18/99 14:51 |
