Figure 2-3: Four Push-Button Switches Surround Rotary Push-Button Switch

Figure 2-5: UCF Constraints for Push-Button Switches

NET “BTN_EAST” LOC = “H13″ | IOSTANDARD = LVTTL | PULLDOWN ;

NET “BTN_NORTH” LOC = “V4″ | IOSTANDARD = LVTTL | PULLDOWN ;

NET “BTN_SOUTH” LOC = “K17″ | IOSTANDARD = LVTTL | PULLDOWN ;

NET “BTN_WEST” LOC = “D18″ | IOSTANDARD = LVTTL | PULLDOWN ;