ID:176221 The fitter is attempting to aggressively pack all registers connected to the input, output, or output enable pins into I/Os.

CAUSE: The value of the Optimize IOC Register Placement for Timing option has been set to Pack All IO Registers. This causes the fitter to aggressively try to pack any registers connected to the input, output, or output enable pins into I/Os. The fitter will not perform register packings that are prevented by user constraints or other legality restrictions. User assignments preventing register packings will always take precedence over this option (For example, by setting Fast Input Register , Fast Output Register , or Fast Output Enable Register options on particular design nodes).

ACTION: No action is required.