27
3.6.3
Using the 2x20 GPIO Expansion Headers
The Board provides two 40-pin expansion headers. The header connects directly to 36 pins of the
Cyclone V SoC FPGA, and also provides DC +5V (VCC5), DC +3.3V (VCC3P3), and two GND
pins. The maximum power consumption of the daughter card that connects to GPIO port is shown
in
Table 3-13
.
Table 3-13 Power Supply of the Expansion Header
Supplied Voltage
Max. Current Limit
5V
1A
3.3V
1.5A
Each pin on the expansion headers is connected to two diodes and a resistor that provides protection
against high and low voltages.
Figure 3-17
shows the protection circuitry for only one of the pin on
the header, but this circuitry is included for all 72 data pins.
Table 3-14
shows all the pin
assignments of the GPIO connector.
Figure 3-17 Connections between the GPIO connector and Cyclone V SoC FPGA
Table 3-14 Pin Assignments for Expansion Headers
Signal Name
FPGA Pin No.
Description
I/O Standard
GPIO_0[0]
PIN_AC18
GPIO Connection 0[0]
3.3V
GPIO_0 [1]
PIN_Y17
GPIO Connection 0[1]
3.3V
GPIO_0 [2]
PIN_AD17
GPIO Connection 0[2]
3.3V
GPIO_0 [3]
PIN_Y18
GPIO Connection 0[3]
3.3V