Digilent Nexys2 Referans Kılavuzu - Sayfa 4

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Digilent

Nexys2 Reference Manual

www.digilentinc.com

"done" LED will illuminate after the FPGA has been

successfully configured. For further information on

using Adept, please see the Adept documentation

available at the Digilent website.

The Nexys2 board can also be programmed using

Xilinx's iMPACT software by connecting a suitable

programming cable to the JTAG header. Digilent's

JTAG3 cable or any other Xilinx cable may be

used.

A demonstration configuration is loaded into the

Platform Flash on the Nexys2 board during

manufacturing. That configuration, also available

on the Digilent webpage, can be used to check all

of the devices and circuits on the Nexys2 board.

Figure 5: Nexys2 board programming circuits

Clocks

The Nexys2 board includes a 50MHz oscillator and a socket for a

second oscillator. Clock signals from the oscillators connect to

global clock input pins on the FPGA so they can drive the clock

synthesizer blocks available in FPGA. The clock synthesizers

(called DLLs, or delay locked loops) provide clock management

capabilities that include doubling or quadrupling the input

frequency, dividing the input frequency by any integer multiple,

and defining precise phase and delay relationships between

various clock signals.

Figure 6: Nexys2 clocks

User I/O

The Nexys2 board includes several input devices, output devices, and data ports, allowing many

designs to be implemented without the need for any other components.

Figure 7: Nexys2 board I/O devices

Inputs: Slide Switches and Pushbuttons

Four pushbuttons and eight slide switches are provided for circuit inputs. Pushbutton inputs are

normally low, and they are driven high only when the pushbutton is pressed. Slide switches generate

constant high or low inputs depending on their position. Pushbutton and slide switch inputs use a

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