Altera Nios Development Board Manuel d'utilisateur télécharger pdf (Page 33)

Altera Corporation 1–25

September 2004 Nios Development Board Reference Manual, Stratix Edition

Board Components

Figure 1–18. LED1 – LED4

Configuration & Reset Buttons

The Nios development board uses dedicated switches SW8, SW9 and

SW10 for the following fixed functions:

SW8 – CPU Reset

When SW8 is pressed, a logic-0 is driven onto the Stratix devices'

DEV_CLRn pin (and user I/O AC9). The result of pressing SW8 depends

on how the Stratix device is currently configured.

The pre-loaded Nios II reference design treats SW8 as a CPU-reset pin

(see Figure 1–19). The Nios II reference design will reset and start

executing code from its reset address when SW8 is pressed.

Table 1–8. 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 FPGA.

LED4 Error Red If the red Error LED is on, then configuration was NOT transferred from

flash memory into the Stratix device. This can happen if, for example, the

flash memory contains neither a valid User or

Safe 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 device. If the Stratix device was

successfully loaded with the user-configuration from flash memory, LED1

will remain on continuously.

LED2 Safe

Config

Amber This LED turns on when the safe-configuration is being transferred from

flash memory and stays illuminated if the safe-configuration was

successfully loaded into the Stratix device.

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Altera Nios Development Board Manuel d'utilisateur Page 33