Altera DE2-115 Manual de usuario descargar pdf (Pagina 33)

 Configuring the EPCS64 in AS Mode

Figure 4-5 illustrates the AS configuration setup. To download a configuration bit stream into the

EPCS64 serial configuration device, perform the following steps:

• Ensure that power is applied to the DE2-115 board.

• Connect the supplied USB cable to the USB Blaster port on the DE2-115 board (See Figure

4-5)

• Configure the JTAG programming circuit by setting the RUN/PROG slide switch (SW19)

to the PROG position.

• The EPCS64 chip can now be programmed by using the Quartus II Programmer to select

a configuration bit stream file with the .pof filename extension.

• Once the programming operation is finished, set the RUN/PROG slide switch back to the

RUN position and then reset the board by turning the power switch off and back on; this

action causes the new configuration data in the EPCS64 device to be loaded into the FPGA

chip.

•

Figure 4-5 The AS configuration scheme

The DE2-115 board provides four push-button switches as shown in Figure 4-6. Each of these

switches is debounced using a Schmitt Trigger circuit, as indicated in Figure 4-7. The four outputs

called KEY0, KEY1, KEY2, and KEY3 of the Schmitt Trigger devices are connected directly to the

Cyclone IV E FPGA. Each push-button switch provides a high logic level when it is not pressed,

and provides a low logic level when depressed. Since the push-button switches are debounced, they

are appropriate for using as clock or reset inputs in a circuit.

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Altera DE2-115 Manual de usuario Pagina 33