Terasic Altera Cyclone V GX Starter Kit, User Manual

Page: 28 / 95

27
D6 3.3-V Power Illuminates when 3.3-V power is active.
D24 HSMC_12-V Power Illuminates when HSMC 12-V power is active.
D23 HSMC_PSNT_n Illuminates when HSMC Daughter Card
is present
D7 ULED Illuminates when the on-board USB-Blaster is working
Figure 3-6 Status LED position
3
3
.
.
2
2
G
G
e
e
n
n
e
e
r
r
a
a
l
l
U
U
s
s
e
e
r
r
I
I
n
n
p
p
u
u
t
t
/
/
O
O
u
u
t
t
p
p
u
u
t
t
This section describes the user I/O interface to the FPGA.

User Defined Push-buttons
The board includes four user defined push-buttons that allow users to interact with the Cyclone V
GX device as shown in
Figure 3-7 . Each of these switches is debounced using a Schmitt Trigger
circuit, as indicated in Figure 3-8 . The four outputs called KEY0, KEY1, KEY2, and KEY3 of the
Schmitt Trigger devices are connected directly to the Cyclone V GX FPGA. Each push-button
switch provides a high logic level when it is not pressed, and provides a low logic level when