Altera Nios Development Board - Manual (Page 27)

Altera Corporation 1–19
December 2004 Nios Development Board Reference Manual, Cyclone Edition
Board Components
Push-Button
Switches SW0 – SW3 are momentary-contact push-button switches that provide
stimulus to designs in the Cyclone device. See
Figure 1–17 . Each switch is
connected to an Cyclone general-purpose I/O pin with a pull-up resistor
as shown in
Table 1–4 . The Cyclone device pin will see a logic 0 when
each switch is pressed.
Individual LEDs This Nios development board provides eight individual LEDs connected
to the Cyclone device. See
Figure 1–17 . D0 – D7 are connected to general
purpose I/O pins on the Cyclone device as shown in Table 1–5 . When the
Cyclone pin drives logic 1, the corresponding LED turns on.
Figure 1–17. SW0 – SW3 Push Button Switches and Individual LEDs
Serial Flash
Connector The serial flash connector (J28) connects to the EPCS4 serial configuration
device and allows designers to program the EPCS4 using the Quartus II
software. Hardware designers do not need the serial flash connector for
using the reference designs that came with the Nios II development kit.
The reference designs allow the designer to access data from the EPCS4
device without using this connector. See
“Cyclone Configuration” on
page 1–21 .
Table 1–4. Push Button Switches Pin Out Table
Button
SW0 SW1 SW2 SW3
Cyclone Pin W3 Y4 V4 W4
Table 1–5. LED Pin Out Table
LED
D0 D1 D2 D3 D4 D5 D6 D7
Cyclone Pin E14 E13 C14 D14 E12 F12 B3 B14