Use this option to control the default output slew rate. You can control the transition time of device output pins by setting the slew rate to Slow or Fast. Limiting the slew rate (Slow) reduces output switching surges in the device. Select Timing Driven to automatically reduce slew rate on output pins covered by timing specifications that can meet speed requirements while operating with slow slew rate. The default is Fast.
Note: Any explicit slew rate control properties in the design or constraints file take precedence over this Output Slew Rate setting.