Altera Cyclone II EP2C35 PCI Development Board - Manual (Page 28)

3–2 Core Version 4.0.0 Altera Corporation
Cyclone II EP2C35 PCI Development Board Reference Manual May 2005
Configure the Cyclone II Device
Configure the
Cyclone II
Device The on-board Cyclone II device can be configured in one of two ways:
■ Serial flash configuration
■ JTAG configuration
Serial Flash Configuration
Serial flash configuration of the Cyclone II device can be accomplished in
two ways:
■ Configuration via user-programmable flash memory
■ Configuration via factory-programmed design
Configuration via User-Programmable Flash Memory
The Cyclone II FPGAs use SRAM cells to store configuration data.
Because SRAM memory is volatile, configuration data must be
downloaded to the Cyclone FPGAs each time power is applied to the
board.
The board has a non-volatile configuration scheme that automatically
configures the Cyclone II device with either a user-programmable or
factory-programmed default design. A switch (J3) is used to select either
the user-programmable or the factory-programmed ECPS64 device. In
referring to the switch position, the board’s bench-top operation
perspective is used. Therefore, when the switch is in the Up position, it is
switched away from the bench and in the same direction as the
component side of the board; the Down position is in the opposite
position.
Upon power-up, the configuration circuit (comprised of the selected
EPCS64 device) configures the Cyclone II device. If the switch (J3) is set
for user configuration (Down position), the circuit attempts to load the
user design. If the load is not successful, the CONF_DONE LED (D10)
does not illuminate and the Cyclone II device is not configured. If the load
is successful, the CONF_DONE LED illuminates.
Configuration via Factory-Programmed Design
When the factory-programmed design is loaded into the Cyclone II
device, the user LEDs blink and the CONF_DONE LED illuminates. To
select the factory default design, set the switch (J3) to the Up position.
f
For more information on either the user-programmable or
factory-programmed design, refer to the PCI Development Kit, Cyclone II
Edition Getting Started User Guide.