R
Chapter 2
Switches, Buttons, and Rotary Knob
Slide Switches
Locations and Labels
The Spartan ? -3A/3AN FPGA Starter Kit board has four slide switches, as shown in
Figure 2-1 . The slide switches are located in the lower right corner of the board and are
labeled SW3 through SW0. Switch SW3 is the left-most switch, and SW0 is the right-most
switch.
HIGH, ‘1’
LOW, ‘0’
SW3
SW2
SW1
SW0
(T9)
(U8)
(U10)
(V8)
UG330_c2_01_021507
Figure 2-1:
Four Slide Switches
Operation
When in the UP or ON position, a switch connects the FPGA pin to 3.3V, a logic High.
When DOWN or in the OFF position, the switch connects the FPGA pin to ground, a logic
Low. The switches typically exhibit about 2 ms of mechanical bounce. There is no active
debouncing circuitry, although such circuitry could easily be added to the FPGA design
programmed on the board.
UCF Location Constraints
Figure 2-2 provides the UCF constraints for the four slide switches, including the I/O pin
assignment and the I/O standard used. The PULLUP resistor is not required, but it defines
the input value when the switch is in the middle of a transition.
Spartan-3A/3AN FPGA Starter Kit Board User Guide www.xilinx.com
UG334 (v1.1) June 19, 2008
25
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