Altera Cyclone III Development Board User Manual download pdf (Page 25)

Chapter 2: Board Components 2–15

Configuration, Status, and Setup Elements

Configuration

This section discusses FPGA, flash memory, and MAX II device programming

methods supported by the Cyclone III development board.

FPGA Programming Over USB

The FPGA can be configured at any time the board is powered on by using the

USB 2.0 interface and the Quartus II Programmer in JTAG mode.

The JTAG chain is mastered by the embedded USB Blaster function found in the

MAX II device. Only a USB cable is needed to program the Cyclone III FPGA. Any

device can be bypassed by using the appropriate switch on the JTAG control DIP

switch.

1 Board reference SW1 position 5 (SW1.5), labeled MAX0, must be in the closed position

(on) for this feature to properly work. If the SW1 switch is in the closed position, the

parallel flash loader (PFL) megafunction in the MAX II CPLD may try to overwrite

the FPGA image just downloaded over the USB immediately after completion.

For more information about:

■ Advanced JTAG settings, refer to Table 2–7.

■ The JTAG control switch, refer to “JTAG Control DIP Switch” on page 2–19.

The JTAG header can be used with an external USB-Blaster cable, or equivalent, to

program either the MAX II CPLD or configure the Cyclone III FPGA. Most users of

the Cyclone III development board do not use the JTAG header at all and instead use

a USB cable along with the embedded USB-Blaster. Using an external USB-Blaster

with the JTAG header requires disabling the embedded USB-Blaster function. See

Ta bl e 2–7.

Figure 2–4. JTAG Chain with the MAX II Device and the Cyclone III Device

2.5V

HSMC Port A

TDI

TDO

TMS

TCK

FPGA

TDI

TDO

TMS

TCK

MAX II

CPLD

PSNTn

HSMC Port B

TDI

TDO

TMS

TCK

PSNTn

TDI

TDO

TMS

TCK

GPIO Pins

JTAG Control

DIP Switch

FPGA_BYPASS

HSMA_BYPASS

USB 2.0

JTAG

Header

TDO

TDI

TMS

TCK

GPIO Pins

Jumper

DEV_SEL

Jumper

JTAG_SEL

HSMA_BYPASS

MAX_EN

1 2 ... 20 21 22 23 24 25 26 27 28 29 30 ... 79 80

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Altera Cyclone III Development Board User Manual Page 25

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