Altera Nios Development Board - Manual (Page 37)

Altera Corporation 2–29
July 2005 Nios Development Board Reference Manual, Stratix II Edition
Board Components
Configuration-Status LEDs
The EPM7128AE device is connected to four status LEDs that show the
configuration status of the board at a glance (see
Figure 2–15 ). You can
tell which configuration, if any, was loaded into the FPGA at power-on
by looking at the LEDs (see
Table 2–8 on page 2–29 ). If a new
configuration was downloaded into the Stratix II device via JTAG, then
all of the LEDs will turn off.
Figure 2–15. LED1 – LED4
Table 2–8. Configuration Status LED Indicators
LED LED Name Color Description
LED3 Loading Green This LED blinks while the configuration controller is actively transferring
data from flash memory into the Stratix II FPGA.
LED4 Error Red If the red Error LED is on, then configuration was not transferred from flash
memory into the Stratix II device. This can happen if, for example, the flash
memory contains neither a valid user or factory configuration.
LED1 User Green This LED turns on when the user configuration is being transferred from
flash memory and stays illuminated when the user configuration data is
successfully loaded into the Stratix II device.
LED2 Factory Amber This LED turns on when the factory configuration is being transferred from
flash memory and stays illuminated if the factory configuration was
successfully loaded into the Stratix II device.