Altera Cyclone IV GX FPGA Development Board Bedienungsanleitung PDF herunterladen (Seite 28)

2–20 Chapter 2: Board Components

Clock Circuitry

Cyclone IV GX FPGA Development Board May 2013 Altera Corporation

Reference Manual

Configuration Push Buttons

The program load push button (S8), is an input to the MAX

II CPLD EPM2210 System

Controller. The push button forces a reconfiguration of the FPGA from flash memory.

The location in the flash memory is based on the

board settings

DIP switch’s

position. Valid settings include

FACTORY

USER

The program select push button (S7), toggles the program LEDs (D3, D4) sequence.

Refer to Table 2–8 on page 2–16 for the LED sequence definitions.

Table 2–17 lists the configuration push buttons component reference and

manufacturing information.

Clock Circuitry

The dedicated clock inputs are located on the top bank 8B and bottom bank 3B of the

Cyclone IV GX device. An on-board programmable oscillator or a bench supply clock

can be distributed to these dedicated clock inputs. The clock going to bank 3B is a

dedicated clock input for 3G applications.

The non-dedicated clocks are located on banks 3A and 8A of the Cyclone IV GX

device. The PCIe reference clock is on bank 3A while the 125-MHz clock is on bank

8A.

Figure 2–5 shows the Cyclone IV GX FPGA development board’s transceiver clock

structure.

Table 2–17. Configuration Push Buttons Component Reference and Manufacturing Information

Board Reference Description Manufacturer

Manufacturer

Part Number

Manufacturer Website

S7, S8 Push buttons Panasonic EVQPAC07K www.panasonic.com/industrial/

Figure 2–5. Cyclone IV GX FPGA Development Board Transceiver Clock Structure

CLKIN SMA (J10)

ICS8543

CLKBUF

(U25)

FPGA

(U10)

CLKOUT SMA (J9)

PCI Express Reference Clock

125-MHz Oscillator (X2)

50-MHz Oscillator (X3)

LVPECL Input Clock (J11, J12)

100-MHz Oscillator (X4)

CLKA_SEL

CLK125_EN

CLKA_EN

Bank 8

Bank 4

Bank 8A

Bank 3A

Bank 8B

Bank 3B Bank 4

1 2 ... 23 24 25 26 27 28 29 30 31 32 33 ... 59 60

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