Quartus

Can't place carry chain of chain length <number> that starts with logic cell <number> because its member cells do not all use signal type <type>, which is enabled for the entire LAB

CAUSE: You are using a CARRY or CARRY_SUM primitive in the design to implement a carry chain of the specified length and that starts at the specified logic cell, but some member cells in the chain use the specified signal type while others do not. Accordingly, the Fitter cannot place this chain in the device because the specified signal type is LAB-wide. When this type of signal is used in a LAB, the Fitter cannot place logic cells that do not use this signal in that LAB. All of the member cells in the chain must use or not use the specified signal type.
ACTION: Modify the chain so that all member cells use or do not use this signal type.

- PLDWorld -

 
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