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4.1i 4000XL MAP - "ERROR:OldMap:256 - Clock buffer BUFG symbol "..." cannot be converted to a BUFGLS due to location constraints."
Keywords: OldMap 256, BUFGLS, UCF
When I use pin LOC constraints on global clocks, the MAP report displays:
ERROR:OldMap:256 - Clock buffer BUFG symbol "..." cannot be converted to a BUFGLS due to location constraints.
To work around this problem, LOC the clock buffer instead of using a pin LOC constraint.
INST "bufg_instance" LOC = "BUFGLS_SSW";
Clock buffers' LOCs are based on compass directions (SSW, NNW, NNE, etc.)
There are currently no plans to fix this.