Quartus

Carry chain that starts with CARRY primitive <name> requires <number> clear signals, but device can only contain <number> clear signals

CAUSE: The carry chain that starts with the specified CARRY primitive requires more clear signals than the device can contain. As a result, the Quartus II software cannot place the carry chain.
ACTION: Modify the design by breaking the chain into smaller chains that require fewer clear signals or by reducing the number of clear signals required by the specified carry chain. You can also change the maximum length of the carry chain with the Carry Chain Length option.

- PLDWorld -

 
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