Altera Nios Development Board Manuel d'utilisateur télécharger pdf (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.

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Altera Nios Development Board Manuel d'utilisateur Page 37