Digilent 410-044-10P-KIT Instrukcja Użytkownika Pobierz pdf (Strona 19)

Spartan-3 Starter Kit Board User Guide www.xilinx.com 19

UG130 (v1.1) May 13, 2005 1-800-255-7778

Chapter 4

Switches and LEDs

Slide Switches

The Spartan-3 Starter Kit board has eight slide switches, indicated as 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.

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 4.7KΩ series resistor provides nominal input protection.

Push Button Switches

The Spartan-3 Starter Kit board has four momentary-contact push button switches,

indicated as 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.

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.

Table 4-1:

Slider Switch Connections

Switch SW7 SW6 SW5 SW4 SW3 SW2 SW1 SW0

FPGA Pin K13 K14 J13 J14 H13 H14 G12 F12

Table 4-2:

Push Button Switch Connections

Push Button BTN3 (User Reset) BTN2 BTN1 BTN0

FPGA Pin L14 L13 M14 M13

1 2 ... 14 15 16 17 18 19 20 21 22 23 24 ... 63 64

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Digilent 410-044-10P-KIT Instrukcja Użytkownika Strona 19