DE4 User Manual
22
www.terasic.com
June 20, 2018
D14
USB_TYPE_A port
(Top USB)
Illuminates when the USB_TYPE_A port has a device.
D13
USB_TYPE_A port
(Bottom USB)
Illuminates when the USB_TYPE_A port has a device.
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Push-buttons
The DE4 board includes six push-buttons that allow you to interact with the Stratix IV GX device.
Each push-button provides a high logic level or a low logic level when it is not pressed or pressed,
respectively.
Table 2–4
lists the board references, signal names and their corresponding Stratix IV
GX device pin numbers.
Table 2–4 Push-button Pin Assignments, Schematic Signal Names, and Functions
Board
Reference
Schematic
Signal Name
Description
I/O
Standard
Stratix IV GX
Pin Number
PB1
BUTTON0
High Logic Level when button not
pressed
3.0-V
PIN_AH5
PB2
BUTTON1
High Logic Level when button not
pressed
3.0-V
PIN_AG5
PB3
BUTTON2
High Logic Level when button not
pressed
3.0-V
PIN_AG7
PB4
BUTTON3
High Logic Level when button not
pressed
3.0-V
PIN_AH8
PB5
CPU_RESET_n FPGA reset
2.5-V
PIN_V34
PB6
RE_CONFIGn
Max II EPM2210 System
re-configuration
-
-
A CPU reset push-button (CPU_RESET_n) is an input to the Stratix IV GX device. It is intended to
be the master reset signal for FPGA designs loaded into the Stratix IV GX device. The
RE_CONFIGn push-button is used to force a reboot on the MAX II EPM2210 CPLD device.
Slide Switches and DIP Switch
There are also four slide switches and one 8-position DIP switch on the DE4 board to provide
additional FPGA input control. Each switch is connected directly to a pin of the Stratix IV GX
FPGA. When a slide switch is in the DOWN position or the UPPER position, it provides a low
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