User manual

DE2 User Manual
35
4.6 Using the Expansion Header
The DE2 Board provides two 40-pin expansion headers. Each header connects directly to 36 pins on
the Cyclone II FPGA, and also provides DC +5V (VCC5), DC +3.3V (VCC33), and two GND pins.
Figure 4.10 shows the related schematics. Each pin on the expansion headers is connected to two
diodes and a resistor that provide protection from high and low voltages. The figure shows the
protection circuitry for only four of the pins on each header, but this circuitry is included for all 72
data pins. Table 4.7 gives the pin assignments.
Figure 4.10. Schematic diagram of the expansion headers.
Signal Name FPGA Pin No. Description
GPIO_0[0] PIN_D25 GPIO Connection 0[0]
GPIO_0[1] PIN_J22 GPIO Connection 0[1]
GPIO_0[2] PIN_E26 GPIO Connection 0[2]
GPIO_0[3] PIN_E25 GPIO Connection 0[3]
GPIO_0[4] PIN_F24 GPIO Connection 0[4]
GPIO_0[5] PIN_F23 GPIO Connection 0[5]
GPIO_0[6] PIN_J21 GPIO Connection 0[6]
GPIO_0[7] PIN_J20 GPIO Connection 0[7]
GPIO_0[8] PIN_F25 GPIO Connection 0[8]
GPIO_0[9] PIN_F26 GPIO Connection 0[9]