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Chapter 4
Switches and LEDs
Slide Switches
The Spartan ? -3 FPGA Starter Kit board has eight slide switches, indicated as 11 in
Figure 1-2 . The switches are located along the lower edge of the board, toward the right
edge. The switches are labeled SW7 through SW0. Switch SW7 is the left-most switch, and
SW0 is the right-most switch. The switches connect to an associated FPGA pin, as shown in
Table 4-1 . A detailed schematic appears in Figure A-2 .
Table 4-1:
Slider Switch Connections
Switch
FPGA Pin
SW7
K13
SW6
K14
SW5
J13
SW4
J14
SW3
H13
SW2
H14
SW1
G12
SW0
F12
When in the UP or ON position, a switch connects the FPGA pin to V CCO , 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 and there is no active
debouncing circuitry, although such circuitry could easily be added to the FPGA design
programmed on the board. A 4.7K Ω series resistor provides nominal input protection.
Push Button Switches
The Spartan-3 Starter Kit board has four momentary-contact push button switches,
indicated as 13 in Figure 1-2 . These push buttons are located along the lower edge of the
board, toward the right edge. The switches are labeled BTN3 through BTN0. Push button
switch BTN3 is the left-most switch, BTN0 the right-most switch. The push button
switches connect to an associated FPGA pin, as shown in Table 4-2 . A detailed schematic
appears in Figure A-2 .
Table 4-2:
Push Button Switch Connections
Push Button
FPGA Pin
BTN3 (User Reset)
L14
BTN2
L13
BTN1
M14
BTN0
M13
Pressing a push button generates a logic High on the associated FPGA pin. Again, there is
no active debouncing circuitry on the push button.
The left-most button, BTN3, is also the default User Reset pin. BTN3 electrically behaves
identically to the other push buttons. However, when applicable, BTN3 resets the
provided reference designs.
Spartan-3 FPGA Starter Kit Board User Guide
UG130 (v1.2) June 20, 2008
www.xilinx.com
19
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