Altera Cyclone III FPGA Starter Board Manual do Utilizador descarregar pdf (Página 19)

Altera Corporation 2–11

April 2012 Cyclone III FPGA Starter Board Reference Manual

Board Components and Interfaces

Push-Buttons

The board has system reset, user reset, and user push-buttons. Table 2–9

lists the pinout for all push-buttons. The push-buttons are in logic “1”

until depressed.

Figure 2–5 shows the push-buttons.

Figure 2–5. Push-Buttons

System Reset Push-Buttons

The system reset push-button starts a reconfiguration of the FPGA from

flash memory.

User Reset Push-Buttons

The user reset push-button is an input to the Cyclone III device. This

push-button is intended to be the master reset signal for the FPGA

designs loaded into the Cyclone III device. The user reset push-button is

connected to the DEV_CLRn pin on the FPGA. The DEV_CLRn setting is a

pin option in the Quartus II software that you must enable to function as

DEV_CLRn instead of a standard I/O.

Table 2–9. Push-Button Pinout

Signal Name FPGA Pin Direction Type

KEY0 F1 Input2.5 V

KEY1 F2 Input2.5 V

KEY2 A10 Input2.5 V

KEY3 B10 Input2.5 V

CPU_RESET_N N2 Input2.5 V

RECONFIGURE H5 (nConfig) Input2.5 V

1 2 ... 14 15 16 17 18 19 20 21 22 23 24 ... 31 32

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Altera Cyclone III FPGA Starter Board Manual do Utilizador Página 19